2009-08-01 17:27:05 +01:00
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/**************************************************************************
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*
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* Copyright 2009 VMware, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/**
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* @file
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* Helper
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*
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* LLVM IR doesn't support all basic arithmetic operations we care about (most
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* notably min/max and saturated operations), and it is often necessary to
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* resort machine-specific intrinsics directly. The functions here hide all
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* these implementation details from the other modules.
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*
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* We also do simple expressions simplification here. Reasons are:
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* - it is very easy given we have all necessary information readily available
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* - LLVM optimization passes fail to simplify several vector expressions
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* - We often know value constraints which the optimization passes have no way
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* of knowing, such as when source arguments are known to be in [0, 1] range.
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*
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* @author Jose Fonseca <jfonseca@vmware.com>
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*/
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2009-08-12 10:35:50 +01:00
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#include "util/u_memory.h"
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2009-08-03 22:31:08 +01:00
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#include "util/u_debug.h"
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2009-10-25 11:48:17 +00:00
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#include "util/u_math.h"
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2009-08-12 02:34:55 +01:00
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#include "util/u_string.h"
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2009-09-29 13:58:58 +01:00
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#include "util/u_cpu_detect.h"
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2009-08-01 17:27:05 +01:00
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2009-08-03 22:24:01 +01:00
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#include "lp_bld_type.h"
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2009-08-12 02:34:55 +01:00
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#include "lp_bld_const.h"
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2009-08-07 01:16:59 +01:00
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#include "lp_bld_intr.h"
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2009-08-31 10:00:38 +01:00
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#include "lp_bld_logic.h"
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2009-10-22 18:28:57 +01:00
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#include "lp_bld_pack.h"
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2009-09-29 17:21:34 +01:00
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#include "lp_bld_debug.h"
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2009-08-01 17:27:05 +01:00
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#include "lp_bld_arit.h"
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2009-08-19 20:13:49 +01:00
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/**
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* Generate min(a, b)
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* No checks for special case values of a or b = 1 or 0 are done.
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*/
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2009-08-02 17:54:53 +01:00
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static LLVMValueRef
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lp_build_min_simple(struct lp_build_context *bld,
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LLVMValueRef a,
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LLVMValueRef b)
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2009-08-01 17:27:05 +01:00
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{
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2009-09-14 11:05:06 +01:00
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const struct lp_type type = bld->type;
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2009-08-02 17:54:53 +01:00
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const char *intrinsic = NULL;
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LLVMValueRef cond;
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/* TODO: optimize the constant case */
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if(type.width * type.length == 128) {
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2009-08-08 22:57:03 +01:00
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if(type.floating) {
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2009-09-29 17:21:34 +01:00
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if(type.width == 32 && util_cpu_caps.has_sse)
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2009-08-02 17:54:53 +01:00
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intrinsic = "llvm.x86.sse.min.ps";
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2009-09-29 17:21:34 +01:00
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if(type.width == 64 && util_cpu_caps.has_sse2)
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2009-08-02 17:54:53 +01:00
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intrinsic = "llvm.x86.sse2.min.pd";
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2009-08-08 22:57:03 +01:00
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}
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2009-08-02 17:54:53 +01:00
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else {
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2009-09-29 17:21:34 +01:00
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if(type.width == 8 && !type.sign && util_cpu_caps.has_sse2)
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2009-08-02 17:54:53 +01:00
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intrinsic = "llvm.x86.sse2.pminu.b";
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2009-09-29 17:21:34 +01:00
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if(type.width == 8 && type.sign && util_cpu_caps.has_sse4_1)
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2009-08-08 22:57:03 +01:00
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intrinsic = "llvm.x86.sse41.pminsb";
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2009-09-29 17:21:34 +01:00
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if(type.width == 16 && !type.sign && util_cpu_caps.has_sse4_1)
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2009-08-08 22:57:03 +01:00
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intrinsic = "llvm.x86.sse41.pminuw";
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2009-09-29 17:21:34 +01:00
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if(type.width == 16 && type.sign && util_cpu_caps.has_sse2)
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2009-08-02 17:54:53 +01:00
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intrinsic = "llvm.x86.sse2.pmins.w";
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2009-09-29 17:21:34 +01:00
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if(type.width == 32 && !type.sign && util_cpu_caps.has_sse4_1)
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2009-08-08 22:57:03 +01:00
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intrinsic = "llvm.x86.sse41.pminud";
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2009-09-29 17:21:34 +01:00
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if(type.width == 32 && type.sign && util_cpu_caps.has_sse4_1)
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2009-08-08 22:57:03 +01:00
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intrinsic = "llvm.x86.sse41.pminsd";
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2009-08-02 17:54:53 +01:00
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}
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}
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2009-08-11 13:09:35 +01:00
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2009-08-02 17:54:53 +01:00
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if(intrinsic)
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2009-08-07 01:16:59 +01:00
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return lp_build_intrinsic_binary(bld->builder, intrinsic, lp_build_vec_type(bld->type), a, b);
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2009-08-02 17:54:53 +01:00
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2009-08-31 10:00:38 +01:00
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cond = lp_build_cmp(bld, PIPE_FUNC_LESS, a, b);
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return lp_build_select(bld, cond, a, b);
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2009-08-01 17:27:05 +01:00
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}
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2009-08-19 20:13:49 +01:00
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/**
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* Generate max(a, b)
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* No checks for special case values of a or b = 1 or 0 are done.
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*/
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2009-08-02 17:54:53 +01:00
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static LLVMValueRef
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lp_build_max_simple(struct lp_build_context *bld,
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LLVMValueRef a,
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LLVMValueRef b)
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2009-08-01 17:27:05 +01:00
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{
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2009-09-14 11:05:06 +01:00
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const struct lp_type type = bld->type;
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2009-08-02 17:54:53 +01:00
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const char *intrinsic = NULL;
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LLVMValueRef cond;
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/* TODO: optimize the constant case */
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if(type.width * type.length == 128) {
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2009-08-08 22:57:03 +01:00
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if(type.floating) {
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2009-09-29 13:58:58 +01:00
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if(type.width == 32 && util_cpu_caps.has_sse)
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2009-08-02 17:54:53 +01:00
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intrinsic = "llvm.x86.sse.max.ps";
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2009-09-29 13:58:58 +01:00
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if(type.width == 64 && util_cpu_caps.has_sse2)
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2009-08-02 17:54:53 +01:00
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intrinsic = "llvm.x86.sse2.max.pd";
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2009-08-08 22:57:03 +01:00
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}
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2009-08-02 17:54:53 +01:00
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else {
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2009-09-29 13:58:58 +01:00
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if(type.width == 8 && !type.sign && util_cpu_caps.has_sse2)
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2009-08-02 17:54:53 +01:00
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intrinsic = "llvm.x86.sse2.pmaxu.b";
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2009-09-29 13:58:58 +01:00
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if(type.width == 8 && type.sign && util_cpu_caps.has_sse4_1)
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2009-08-08 22:57:03 +01:00
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intrinsic = "llvm.x86.sse41.pmaxsb";
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2009-09-29 13:58:58 +01:00
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if(type.width == 16 && !type.sign && util_cpu_caps.has_sse4_1)
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2009-08-08 22:57:03 +01:00
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intrinsic = "llvm.x86.sse41.pmaxuw";
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2009-09-29 13:58:58 +01:00
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if(type.width == 16 && type.sign && util_cpu_caps.has_sse2)
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2009-08-02 17:54:53 +01:00
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intrinsic = "llvm.x86.sse2.pmaxs.w";
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2009-09-29 13:58:58 +01:00
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if(type.width == 32 && !type.sign && util_cpu_caps.has_sse4_1)
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2009-08-08 22:57:03 +01:00
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intrinsic = "llvm.x86.sse41.pmaxud";
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2009-09-29 13:58:58 +01:00
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if(type.width == 32 && type.sign && util_cpu_caps.has_sse4_1)
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2009-08-08 22:57:03 +01:00
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intrinsic = "llvm.x86.sse41.pmaxsd";
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2009-08-02 17:54:53 +01:00
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}
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}
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if(intrinsic)
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2009-08-07 01:16:59 +01:00
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return lp_build_intrinsic_binary(bld->builder, intrinsic, lp_build_vec_type(bld->type), a, b);
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2009-08-02 17:54:53 +01:00
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2009-08-31 10:00:38 +01:00
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cond = lp_build_cmp(bld, PIPE_FUNC_GREATER, a, b);
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return lp_build_select(bld, cond, a, b);
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2009-08-01 17:27:05 +01:00
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}
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2009-08-19 20:13:49 +01:00
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/**
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* Generate 1 - a, or ~a depending on bld->type.
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*/
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2009-08-01 17:27:05 +01:00
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LLVMValueRef
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2009-08-02 17:54:53 +01:00
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lp_build_comp(struct lp_build_context *bld,
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LLVMValueRef a)
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2009-08-01 17:27:05 +01:00
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{
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2009-09-14 11:05:06 +01:00
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const struct lp_type type = bld->type;
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2009-08-02 17:54:53 +01:00
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if(a == bld->one)
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return bld->zero;
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if(a == bld->zero)
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return bld->one;
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if(type.norm && !type.floating && !type.fixed && !type.sign) {
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if(LLVMIsConstant(a))
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return LLVMConstNot(a);
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else
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return LLVMBuildNot(bld->builder, a, "");
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}
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if(LLVMIsConstant(a))
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return LLVMConstSub(bld->one, a);
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2009-08-01 17:27:05 +01:00
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else
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2009-08-02 17:54:53 +01:00
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return LLVMBuildSub(bld->builder, bld->one, a, "");
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2009-08-01 17:27:05 +01:00
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}
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2009-08-19 20:13:49 +01:00
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/**
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* Generate a + b
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*/
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2009-08-01 17:27:05 +01:00
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LLVMValueRef
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2009-08-02 17:54:53 +01:00
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lp_build_add(struct lp_build_context *bld,
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2009-08-01 17:27:05 +01:00
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LLVMValueRef a,
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LLVMValueRef b)
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{
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2009-09-14 11:05:06 +01:00
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const struct lp_type type = bld->type;
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2009-08-02 17:54:53 +01:00
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LLVMValueRef res;
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2009-08-01 17:27:05 +01:00
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2009-08-02 17:54:53 +01:00
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if(a == bld->zero)
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return b;
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if(b == bld->zero)
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return a;
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if(a == bld->undef || b == bld->undef)
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return bld->undef;
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2009-08-01 17:27:05 +01:00
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2009-08-02 17:54:53 +01:00
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if(bld->type.norm) {
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const char *intrinsic = NULL;
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2009-08-01 17:27:05 +01:00
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2009-08-02 17:54:53 +01:00
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if(a == bld->one || b == bld->one)
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return bld->one;
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2009-08-01 17:27:05 +01:00
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2009-09-29 13:58:58 +01:00
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if(util_cpu_caps.has_sse2 &&
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type.width * type.length == 128 &&
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2009-08-02 17:54:53 +01:00
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!type.floating && !type.fixed) {
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if(type.width == 8)
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2009-08-03 00:01:27 +01:00
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intrinsic = type.sign ? "llvm.x86.sse2.padds.b" : "llvm.x86.sse2.paddus.b";
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2009-08-02 17:54:53 +01:00
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if(type.width == 16)
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2009-08-03 00:01:27 +01:00
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intrinsic = type.sign ? "llvm.x86.sse2.padds.w" : "llvm.x86.sse2.paddus.w";
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2009-08-02 17:54:53 +01:00
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}
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if(intrinsic)
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2009-08-07 01:16:59 +01:00
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return lp_build_intrinsic_binary(bld->builder, intrinsic, lp_build_vec_type(bld->type), a, b);
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2009-08-02 17:54:53 +01:00
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}
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if(LLVMIsConstant(a) && LLVMIsConstant(b))
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res = LLVMConstAdd(a, b);
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else
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res = LLVMBuildAdd(bld->builder, a, b, "");
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2009-08-19 20:13:49 +01:00
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/* clamp to ceiling of 1.0 */
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2009-08-02 17:54:53 +01:00
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if(bld->type.norm && (bld->type.floating || bld->type.fixed))
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res = lp_build_min_simple(bld, res, bld->one);
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2009-08-19 20:13:49 +01:00
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/* XXX clamp to floor of -1 or 0??? */
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2009-08-02 17:54:53 +01:00
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return res;
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2009-08-01 17:27:05 +01:00
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}
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2009-08-19 20:13:49 +01:00
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/**
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* Generate a - b
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*/
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2009-08-01 17:27:05 +01:00
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LLVMValueRef
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2009-08-02 17:54:53 +01:00
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lp_build_sub(struct lp_build_context *bld,
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2009-08-01 17:27:05 +01:00
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LLVMValueRef a,
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LLVMValueRef b)
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{
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2009-09-14 11:05:06 +01:00
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const struct lp_type type = bld->type;
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2009-08-02 17:54:53 +01:00
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LLVMValueRef res;
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2009-08-01 17:27:05 +01:00
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2009-08-02 17:54:53 +01:00
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if(b == bld->zero)
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return a;
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if(a == bld->undef || b == bld->undef)
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return bld->undef;
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if(a == b)
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return bld->zero;
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2009-08-01 17:27:05 +01:00
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2009-08-02 17:54:53 +01:00
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if(bld->type.norm) {
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const char *intrinsic = NULL;
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2009-08-01 17:27:05 +01:00
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2009-08-02 17:54:53 +01:00
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if(b == bld->one)
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return bld->zero;
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2009-08-01 17:27:05 +01:00
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2009-09-29 13:58:58 +01:00
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if(util_cpu_caps.has_sse2 &&
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type.width * type.length == 128 &&
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2009-08-02 17:54:53 +01:00
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!type.floating && !type.fixed) {
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if(type.width == 8)
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2009-08-03 00:01:27 +01:00
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intrinsic = type.sign ? "llvm.x86.sse2.psubs.b" : "llvm.x86.sse2.psubus.b";
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2009-08-02 17:54:53 +01:00
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if(type.width == 16)
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2009-08-03 00:01:27 +01:00
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intrinsic = type.sign ? "llvm.x86.sse2.psubs.w" : "llvm.x86.sse2.psubus.w";
|
2009-08-02 17:54:53 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
if(intrinsic)
|
2009-08-07 01:16:59 +01:00
|
|
|
return lp_build_intrinsic_binary(bld->builder, intrinsic, lp_build_vec_type(bld->type), a, b);
|
2009-08-02 17:54:53 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
if(LLVMIsConstant(a) && LLVMIsConstant(b))
|
|
|
|
res = LLVMConstSub(a, b);
|
|
|
|
else
|
|
|
|
res = LLVMBuildSub(bld->builder, a, b, "");
|
|
|
|
|
|
|
|
if(bld->type.norm && (bld->type.floating || bld->type.fixed))
|
|
|
|
res = lp_build_max_simple(bld, res, bld->zero);
|
|
|
|
|
|
|
|
return res;
|
2009-08-01 17:27:05 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-03 00:01:27 +01:00
|
|
|
/**
|
|
|
|
* Normalized 8bit multiplication.
|
|
|
|
*
|
|
|
|
* - alpha plus one
|
|
|
|
*
|
|
|
|
* makes the following approximation to the division (Sree)
|
|
|
|
*
|
|
|
|
* a*b/255 ~= (a*(b + 1)) >> 256
|
|
|
|
*
|
|
|
|
* which is the fastest method that satisfies the following OpenGL criteria
|
|
|
|
*
|
|
|
|
* 0*0 = 0 and 255*255 = 255
|
|
|
|
*
|
|
|
|
* - geometric series
|
|
|
|
*
|
|
|
|
* takes the geometric series approximation to the division
|
|
|
|
*
|
|
|
|
* t/255 = (t >> 8) + (t >> 16) + (t >> 24) ..
|
|
|
|
*
|
|
|
|
* in this case just the first two terms to fit in 16bit arithmetic
|
|
|
|
*
|
|
|
|
* t/255 ~= (t + (t >> 8)) >> 8
|
|
|
|
*
|
|
|
|
* note that just by itself it doesn't satisfies the OpenGL criteria, as
|
|
|
|
* 255*255 = 254, so the special case b = 255 must be accounted or roundoff
|
|
|
|
* must be used
|
|
|
|
*
|
|
|
|
* - geometric series plus rounding
|
|
|
|
*
|
|
|
|
* when using a geometric series division instead of truncating the result
|
|
|
|
* use roundoff in the approximation (Jim Blinn)
|
|
|
|
*
|
|
|
|
* t/255 ~= (t + (t >> 8) + 0x80) >> 8
|
|
|
|
*
|
|
|
|
* achieving the exact results
|
|
|
|
*
|
|
|
|
* @sa Alvy Ray Smith, Image Compositing Fundamentals, Tech Memo 4, Aug 15, 1995,
|
|
|
|
* ftp://ftp.alvyray.com/Acrobat/4_Comp.pdf
|
|
|
|
* @sa Michael Herf, The "double blend trick", May 2000,
|
|
|
|
* http://www.stereopsis.com/doubleblend.html
|
|
|
|
*/
|
|
|
|
static LLVMValueRef
|
|
|
|
lp_build_mul_u8n(LLVMBuilderRef builder,
|
2009-10-22 18:28:57 +01:00
|
|
|
struct lp_type i16_type,
|
2009-08-03 00:01:27 +01:00
|
|
|
LLVMValueRef a, LLVMValueRef b)
|
|
|
|
{
|
2009-10-22 18:28:57 +01:00
|
|
|
LLVMValueRef c8;
|
2009-08-03 00:01:27 +01:00
|
|
|
LLVMValueRef ab;
|
|
|
|
|
2009-10-22 18:28:57 +01:00
|
|
|
c8 = lp_build_int_const_scalar(i16_type, 8);
|
2009-08-03 00:01:27 +01:00
|
|
|
|
|
|
|
#if 0
|
|
|
|
|
|
|
|
/* a*b/255 ~= (a*(b + 1)) >> 256 */
|
2009-10-22 18:28:57 +01:00
|
|
|
b = LLVMBuildAdd(builder, b, lp_build_int_const_scalar(i16_type, 1), "");
|
2009-08-03 00:01:27 +01:00
|
|
|
ab = LLVMBuildMul(builder, a, b, "");
|
|
|
|
|
|
|
|
#else
|
|
|
|
|
2009-10-22 18:28:57 +01:00
|
|
|
/* ab/255 ~= (ab + (ab >> 8) + 0x80) >> 8 */
|
2009-08-03 00:01:27 +01:00
|
|
|
ab = LLVMBuildMul(builder, a, b, "");
|
2009-10-22 18:28:57 +01:00
|
|
|
ab = LLVMBuildAdd(builder, ab, LLVMBuildLShr(builder, ab, c8, ""), "");
|
|
|
|
ab = LLVMBuildAdd(builder, ab, lp_build_int_const_scalar(i16_type, 0x80), "");
|
2009-08-03 00:01:27 +01:00
|
|
|
|
|
|
|
#endif
|
|
|
|
|
2009-10-22 18:28:57 +01:00
|
|
|
ab = LLVMBuildLShr(builder, ab, c8, "");
|
2009-08-03 00:01:27 +01:00
|
|
|
|
|
|
|
return ab;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-19 20:13:49 +01:00
|
|
|
/**
|
|
|
|
* Generate a * b
|
|
|
|
*/
|
2009-08-01 17:27:05 +01:00
|
|
|
LLVMValueRef
|
2009-08-02 17:54:53 +01:00
|
|
|
lp_build_mul(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a,
|
|
|
|
LLVMValueRef b)
|
2009-08-01 17:27:05 +01:00
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-10-25 09:16:38 +00:00
|
|
|
LLVMValueRef shift;
|
|
|
|
LLVMValueRef res;
|
2009-08-03 00:01:27 +01:00
|
|
|
|
2009-08-02 17:54:53 +01:00
|
|
|
if(a == bld->zero)
|
|
|
|
return bld->zero;
|
|
|
|
if(a == bld->one)
|
2009-08-01 17:27:05 +01:00
|
|
|
return b;
|
2009-08-02 17:54:53 +01:00
|
|
|
if(b == bld->zero)
|
|
|
|
return bld->zero;
|
|
|
|
if(b == bld->one)
|
2009-08-01 17:27:05 +01:00
|
|
|
return a;
|
2009-08-02 17:54:53 +01:00
|
|
|
if(a == bld->undef || b == bld->undef)
|
|
|
|
return bld->undef;
|
2009-08-01 17:27:05 +01:00
|
|
|
|
2009-08-03 00:01:27 +01:00
|
|
|
if(!type.floating && !type.fixed && type.norm) {
|
2009-10-22 18:28:57 +01:00
|
|
|
if(type.width == 8) {
|
|
|
|
struct lp_type i16_type = lp_wider_type(type);
|
|
|
|
LLVMValueRef al, ah, bl, bh, abl, abh, ab;
|
2009-08-03 00:01:27 +01:00
|
|
|
|
2009-10-22 18:28:57 +01:00
|
|
|
lp_build_unpack2(bld->builder, type, i16_type, a, &al, &ah);
|
|
|
|
lp_build_unpack2(bld->builder, type, i16_type, b, &bl, &bh);
|
2009-08-03 00:01:27 +01:00
|
|
|
|
|
|
|
/* PMULLW, PSRLW, PADDW */
|
2009-10-22 18:28:57 +01:00
|
|
|
abl = lp_build_mul_u8n(bld->builder, i16_type, al, bl);
|
|
|
|
abh = lp_build_mul_u8n(bld->builder, i16_type, ah, bh);
|
2009-08-03 00:01:27 +01:00
|
|
|
|
2009-10-22 18:28:57 +01:00
|
|
|
ab = lp_build_pack2(bld->builder, i16_type, type, abl, abh);
|
2009-08-03 00:01:27 +01:00
|
|
|
|
|
|
|
return ab;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* FIXME */
|
|
|
|
assert(0);
|
|
|
|
}
|
|
|
|
|
2009-10-25 09:16:38 +00:00
|
|
|
if(type.fixed)
|
|
|
|
shift = lp_build_int_const_scalar(type, type.width/2);
|
|
|
|
else
|
|
|
|
shift = NULL;
|
|
|
|
|
|
|
|
if(LLVMIsConstant(a) && LLVMIsConstant(b)) {
|
|
|
|
res = LLVMConstMul(a, b);
|
|
|
|
if(shift) {
|
|
|
|
if(type.sign)
|
|
|
|
res = LLVMConstAShr(res, shift);
|
|
|
|
else
|
|
|
|
res = LLVMConstLShr(res, shift);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
res = LLVMBuildMul(bld->builder, a, b, "");
|
|
|
|
if(shift) {
|
|
|
|
if(type.sign)
|
|
|
|
res = LLVMBuildAShr(bld->builder, res, shift, "");
|
|
|
|
else
|
|
|
|
res = LLVMBuildLShr(bld->builder, res, shift, "");
|
|
|
|
}
|
|
|
|
}
|
2009-08-02 17:54:53 +01:00
|
|
|
|
2009-10-25 09:16:38 +00:00
|
|
|
return res;
|
2009-08-01 17:27:05 +01:00
|
|
|
}
|
|
|
|
|
2009-08-02 17:54:53 +01:00
|
|
|
|
2009-10-25 11:48:17 +00:00
|
|
|
/**
|
|
|
|
* Small vector x scale multiplication optimization.
|
|
|
|
*/
|
|
|
|
LLVMValueRef
|
|
|
|
lp_build_mul_imm(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a,
|
|
|
|
int b)
|
|
|
|
{
|
|
|
|
LLVMValueRef factor;
|
|
|
|
|
|
|
|
if(b == 0)
|
|
|
|
return bld->zero;
|
2009-08-02 17:54:53 +01:00
|
|
|
|
2009-10-25 11:48:17 +00:00
|
|
|
if(b == 1)
|
|
|
|
return a;
|
|
|
|
|
|
|
|
if(b == -1)
|
|
|
|
return LLVMBuildNeg(bld->builder, a, "");
|
|
|
|
|
|
|
|
if(b == 2 && bld->type.floating)
|
|
|
|
return lp_build_add(bld, a, a);
|
|
|
|
|
|
|
|
if(util_is_pot(b)) {
|
|
|
|
unsigned shift = ffs(b) - 1;
|
|
|
|
|
|
|
|
if(bld->type.floating) {
|
|
|
|
#if 0
|
|
|
|
/*
|
|
|
|
* Power of two multiplication by directly manipulating the mantissa.
|
|
|
|
*
|
|
|
|
* XXX: This might not be always faster, it will introduce a small error
|
|
|
|
* for multiplication by zero, and it will produce wrong results
|
|
|
|
* for Inf and NaN.
|
|
|
|
*/
|
|
|
|
unsigned mantissa = lp_mantissa(bld->type);
|
|
|
|
factor = lp_build_int_const_scalar(bld->type, (unsigned long long)shift << mantissa);
|
|
|
|
a = LLVMBuildBitCast(bld->builder, a, lp_build_int_vec_type(bld->type), "");
|
|
|
|
a = LLVMBuildAdd(bld->builder, a, factor, "");
|
|
|
|
a = LLVMBuildBitCast(bld->builder, a, lp_build_vec_type(bld->type), "");
|
|
|
|
return a;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
factor = lp_build_const_scalar(bld->type, shift);
|
|
|
|
return LLVMBuildShl(bld->builder, a, factor, "");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
factor = lp_build_const_scalar(bld->type, (double)b);
|
|
|
|
return lp_build_mul(bld, a, factor);
|
2009-08-01 17:27:05 +01:00
|
|
|
}
|
|
|
|
|
2009-08-02 17:54:53 +01:00
|
|
|
|
2009-08-19 20:13:49 +01:00
|
|
|
/**
|
|
|
|
* Generate a / b
|
|
|
|
*/
|
2009-08-11 13:09:35 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_div(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a,
|
|
|
|
LLVMValueRef b)
|
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-08-11 13:09:35 +01:00
|
|
|
|
|
|
|
if(a == bld->zero)
|
|
|
|
return bld->zero;
|
|
|
|
if(a == bld->one)
|
|
|
|
return lp_build_rcp(bld, b);
|
|
|
|
if(b == bld->zero)
|
|
|
|
return bld->undef;
|
|
|
|
if(b == bld->one)
|
|
|
|
return a;
|
|
|
|
if(a == bld->undef || b == bld->undef)
|
|
|
|
return bld->undef;
|
|
|
|
|
|
|
|
if(LLVMIsConstant(a) && LLVMIsConstant(b))
|
|
|
|
return LLVMConstFDiv(a, b);
|
|
|
|
|
2009-09-29 13:58:58 +01:00
|
|
|
if(util_cpu_caps.has_sse && type.width == 32 && type.length == 4)
|
2009-08-11 13:09:35 +01:00
|
|
|
return lp_build_mul(bld, a, lp_build_rcp(bld, b));
|
|
|
|
|
|
|
|
return LLVMBuildFDiv(bld->builder, a, b, "");
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-10-25 09:16:38 +00:00
|
|
|
/**
|
|
|
|
* Linear interpolation.
|
|
|
|
*
|
|
|
|
* This also works for integer values with a few caveats.
|
|
|
|
*
|
|
|
|
* @sa http://www.stereopsis.com/doubleblend.html
|
|
|
|
*/
|
2009-09-07 14:27:06 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_lerp(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef x,
|
|
|
|
LLVMValueRef v0,
|
|
|
|
LLVMValueRef v1)
|
|
|
|
{
|
2009-10-25 09:16:38 +00:00
|
|
|
LLVMValueRef delta;
|
|
|
|
LLVMValueRef res;
|
|
|
|
|
|
|
|
delta = lp_build_sub(bld, v1, v0);
|
|
|
|
|
|
|
|
res = lp_build_mul(bld, x, delta);
|
|
|
|
|
|
|
|
res = lp_build_add(bld, v0, res);
|
|
|
|
|
|
|
|
if(bld->type.fixed)
|
|
|
|
/* XXX: This step is necessary for lerping 8bit colors stored on 16bits,
|
|
|
|
* but it will be wrong for other uses. Basically we need a more
|
|
|
|
* powerful lp_type, capable of further distinguishing the values
|
|
|
|
* interpretation from the value storage. */
|
|
|
|
res = LLVMBuildAnd(bld->builder, res, lp_build_int_const_scalar(bld->type, (1 << bld->type.width/2) - 1), "");
|
|
|
|
|
|
|
|
return res;
|
2009-09-07 14:27:06 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
LLVMValueRef
|
|
|
|
lp_build_lerp_2d(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef x,
|
|
|
|
LLVMValueRef y,
|
|
|
|
LLVMValueRef v00,
|
|
|
|
LLVMValueRef v01,
|
|
|
|
LLVMValueRef v10,
|
|
|
|
LLVMValueRef v11)
|
|
|
|
{
|
|
|
|
LLVMValueRef v0 = lp_build_lerp(bld, x, v00, v01);
|
|
|
|
LLVMValueRef v1 = lp_build_lerp(bld, x, v10, v11);
|
|
|
|
return lp_build_lerp(bld, y, v0, v1);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-19 20:13:49 +01:00
|
|
|
/**
|
|
|
|
* Generate min(a, b)
|
|
|
|
* Do checks for special cases.
|
|
|
|
*/
|
2009-08-01 17:27:05 +01:00
|
|
|
LLVMValueRef
|
2009-08-02 17:54:53 +01:00
|
|
|
lp_build_min(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a,
|
|
|
|
LLVMValueRef b)
|
2009-08-01 17:27:05 +01:00
|
|
|
{
|
2009-08-02 17:54:53 +01:00
|
|
|
if(a == bld->undef || b == bld->undef)
|
|
|
|
return bld->undef;
|
|
|
|
|
2009-08-03 19:31:56 +01:00
|
|
|
if(a == b)
|
|
|
|
return a;
|
|
|
|
|
2009-08-02 17:54:53 +01:00
|
|
|
if(bld->type.norm) {
|
|
|
|
if(a == bld->zero || b == bld->zero)
|
|
|
|
return bld->zero;
|
|
|
|
if(a == bld->one)
|
|
|
|
return b;
|
|
|
|
if(b == bld->one)
|
|
|
|
return a;
|
|
|
|
}
|
|
|
|
|
|
|
|
return lp_build_min_simple(bld, a, b);
|
2009-08-01 17:27:05 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-19 20:13:49 +01:00
|
|
|
/**
|
|
|
|
* Generate max(a, b)
|
|
|
|
* Do checks for special cases.
|
|
|
|
*/
|
2009-08-01 17:27:05 +01:00
|
|
|
LLVMValueRef
|
2009-08-02 17:54:53 +01:00
|
|
|
lp_build_max(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a,
|
|
|
|
LLVMValueRef b)
|
2009-08-01 17:27:05 +01:00
|
|
|
{
|
2009-08-02 17:54:53 +01:00
|
|
|
if(a == bld->undef || b == bld->undef)
|
|
|
|
return bld->undef;
|
|
|
|
|
2009-08-03 19:31:56 +01:00
|
|
|
if(a == b)
|
|
|
|
return a;
|
|
|
|
|
2009-08-02 17:54:53 +01:00
|
|
|
if(bld->type.norm) {
|
|
|
|
if(a == bld->one || b == bld->one)
|
|
|
|
return bld->one;
|
|
|
|
if(a == bld->zero)
|
|
|
|
return b;
|
|
|
|
if(b == bld->zero)
|
|
|
|
return a;
|
|
|
|
}
|
|
|
|
|
|
|
|
return lp_build_max_simple(bld, a, b);
|
2009-08-01 17:27:05 +01:00
|
|
|
}
|
2009-08-11 13:09:35 +01:00
|
|
|
|
|
|
|
|
2010-02-24 04:16:18 +00:00
|
|
|
/**
|
|
|
|
* Generate clamp(a, min, max)
|
|
|
|
* Do checks for special cases.
|
|
|
|
*/
|
|
|
|
LLVMValueRef
|
|
|
|
lp_build_clamp(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a,
|
|
|
|
LLVMValueRef min,
|
|
|
|
LLVMValueRef max)
|
|
|
|
{
|
|
|
|
a = lp_build_min(bld, a, max);
|
|
|
|
a = lp_build_max(bld, a, min);
|
|
|
|
return a;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-19 20:13:49 +01:00
|
|
|
/**
|
|
|
|
* Generate abs(a)
|
|
|
|
*/
|
2009-08-11 13:09:35 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_abs(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-09-07 14:53:15 +01:00
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
2009-08-11 13:09:35 +01:00
|
|
|
|
|
|
|
if(!type.sign)
|
|
|
|
return a;
|
|
|
|
|
2009-09-07 14:53:15 +01:00
|
|
|
if(type.floating) {
|
|
|
|
/* Mask out the sign bit */
|
|
|
|
LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);
|
2009-12-15 14:58:37 +00:00
|
|
|
unsigned long long absMask = ~(1ULL << (type.width - 1));
|
2009-12-14 22:24:31 +00:00
|
|
|
LLVMValueRef mask = lp_build_int_const_scalar(type, ((unsigned long long) absMask));
|
2009-09-07 14:53:15 +01:00
|
|
|
a = LLVMBuildBitCast(bld->builder, a, int_vec_type, "");
|
|
|
|
a = LLVMBuildAnd(bld->builder, a, mask, "");
|
|
|
|
a = LLVMBuildBitCast(bld->builder, a, vec_type, "");
|
|
|
|
return a;
|
|
|
|
}
|
|
|
|
|
2009-09-29 13:58:58 +01:00
|
|
|
if(type.width*type.length == 128 && util_cpu_caps.has_ssse3) {
|
2009-09-07 14:53:15 +01:00
|
|
|
switch(type.width) {
|
|
|
|
case 8:
|
2009-08-11 13:09:35 +01:00
|
|
|
return lp_build_intrinsic_unary(bld->builder, "llvm.x86.ssse3.pabs.b.128", vec_type, a);
|
2009-09-07 14:53:15 +01:00
|
|
|
case 16:
|
2009-08-11 13:09:35 +01:00
|
|
|
return lp_build_intrinsic_unary(bld->builder, "llvm.x86.ssse3.pabs.w.128", vec_type, a);
|
2009-09-07 14:53:15 +01:00
|
|
|
case 32:
|
2009-08-11 13:09:35 +01:00
|
|
|
return lp_build_intrinsic_unary(bld->builder, "llvm.x86.ssse3.pabs.d.128", vec_type, a);
|
2009-09-07 14:53:15 +01:00
|
|
|
}
|
2009-08-11 13:09:35 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
return lp_build_max(bld, a, LLVMBuildNeg(bld->builder, a, ""));
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2010-03-04 15:36:26 +00:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_negate(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
|
|
|
return LLVMBuildNeg(bld->builder, a, "");
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-09-13 13:50:19 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_sgn(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-09-13 13:50:19 +01:00
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
|
|
|
LLVMValueRef cond;
|
|
|
|
LLVMValueRef res;
|
|
|
|
|
|
|
|
/* Handle non-zero case */
|
|
|
|
if(!type.sign) {
|
|
|
|
/* if not zero then sign must be positive */
|
|
|
|
res = bld->one;
|
|
|
|
}
|
|
|
|
else if(type.floating) {
|
|
|
|
/* Take the sign bit and add it to 1 constant */
|
|
|
|
LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);
|
|
|
|
LLVMValueRef mask = lp_build_int_const_scalar(type, (unsigned long long)1 << (type.width - 1));
|
|
|
|
LLVMValueRef sign;
|
|
|
|
LLVMValueRef one;
|
|
|
|
sign = LLVMBuildBitCast(bld->builder, a, int_vec_type, "");
|
|
|
|
sign = LLVMBuildAnd(bld->builder, sign, mask, "");
|
|
|
|
one = LLVMConstBitCast(bld->one, int_vec_type);
|
|
|
|
res = LLVMBuildOr(bld->builder, sign, one, "");
|
|
|
|
res = LLVMBuildBitCast(bld->builder, res, vec_type, "");
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
LLVMValueRef minus_one = lp_build_const_scalar(type, -1.0);
|
|
|
|
cond = lp_build_cmp(bld, PIPE_FUNC_GREATER, a, bld->zero);
|
|
|
|
res = lp_build_select(bld, cond, bld->one, minus_one);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Handle zero */
|
|
|
|
cond = lp_build_cmp(bld, PIPE_FUNC_EQUAL, a, bld->zero);
|
|
|
|
res = lp_build_select(bld, cond, bld->zero, bld->one);
|
|
|
|
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2010-03-04 16:45:34 +00:00
|
|
|
/**
|
|
|
|
* Set the sign of float vector 'a' according to 'sign'.
|
|
|
|
* If sign==0, return abs(a).
|
|
|
|
* If sign==1, return -abs(a);
|
|
|
|
* Other values for sign produce undefined results.
|
|
|
|
*/
|
|
|
|
LLVMValueRef
|
|
|
|
lp_build_set_sign(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a, LLVMValueRef sign)
|
|
|
|
{
|
|
|
|
const struct lp_type type = bld->type;
|
|
|
|
LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);
|
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
|
|
|
LLVMValueRef shift = lp_build_int_const_scalar(type, type.width - 1);
|
|
|
|
LLVMValueRef mask = lp_build_int_const_scalar(type,
|
|
|
|
~((unsigned long long) 1 << (type.width - 1)));
|
|
|
|
LLVMValueRef val, res;
|
|
|
|
|
|
|
|
assert(type.floating);
|
|
|
|
|
|
|
|
/* val = reinterpret_cast<int>(a) */
|
|
|
|
val = LLVMBuildBitCast(bld->builder, a, int_vec_type, "");
|
|
|
|
/* val = val & mask */
|
|
|
|
val = LLVMBuildAnd(bld->builder, val, mask, "");
|
|
|
|
/* sign = sign << shift */
|
|
|
|
sign = LLVMBuildShl(bld->builder, sign, shift, "");
|
|
|
|
/* res = val | sign */
|
|
|
|
res = LLVMBuildOr(bld->builder, val, sign, "");
|
|
|
|
/* res = reinterpret_cast<float>(res) */
|
|
|
|
res = LLVMBuildBitCast(bld->builder, res, vec_type, "");
|
|
|
|
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2010-02-24 04:16:18 +00:00
|
|
|
/**
|
|
|
|
* Convert vector of int to vector of float.
|
|
|
|
*/
|
|
|
|
LLVMValueRef
|
|
|
|
lp_build_int_to_float(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
|
|
|
const struct lp_type type = bld->type;
|
|
|
|
|
|
|
|
assert(type.floating);
|
|
|
|
/*assert(lp_check_value(type, a));*/
|
|
|
|
|
|
|
|
{
|
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
|
|
|
/*LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);*/
|
|
|
|
LLVMValueRef res;
|
|
|
|
res = LLVMBuildSIToFP(bld->builder, a, vec_type, "");
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
2009-09-07 14:26:30 +01:00
|
|
|
enum lp_build_round_sse41_mode
|
|
|
|
{
|
|
|
|
LP_BUILD_ROUND_SSE41_NEAREST = 0,
|
|
|
|
LP_BUILD_ROUND_SSE41_FLOOR = 1,
|
|
|
|
LP_BUILD_ROUND_SSE41_CEIL = 2,
|
|
|
|
LP_BUILD_ROUND_SSE41_TRUNCATE = 3
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
static INLINE LLVMValueRef
|
|
|
|
lp_build_round_sse41(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a,
|
|
|
|
enum lp_build_round_sse41_mode mode)
|
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-09-07 14:26:30 +01:00
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
|
|
|
const char *intrinsic;
|
|
|
|
|
|
|
|
assert(type.floating);
|
|
|
|
assert(type.width*type.length == 128);
|
2009-09-29 16:59:13 +01:00
|
|
|
assert(lp_check_value(type, a));
|
|
|
|
assert(util_cpu_caps.has_sse4_1);
|
2009-09-07 14:26:30 +01:00
|
|
|
|
|
|
|
switch(type.width) {
|
|
|
|
case 32:
|
|
|
|
intrinsic = "llvm.x86.sse41.round.ps";
|
|
|
|
break;
|
|
|
|
case 64:
|
|
|
|
intrinsic = "llvm.x86.sse41.round.pd";
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
assert(0);
|
|
|
|
return bld->undef;
|
|
|
|
}
|
|
|
|
|
|
|
|
return lp_build_intrinsic_binary(bld->builder, intrinsic, vec_type, a,
|
|
|
|
LLVMConstInt(LLVMInt32Type(), mode, 0));
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-09-29 16:59:13 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_trunc(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
|
|
|
const struct lp_type type = bld->type;
|
|
|
|
|
|
|
|
assert(type.floating);
|
|
|
|
assert(lp_check_value(type, a));
|
|
|
|
|
|
|
|
if(util_cpu_caps.has_sse4_1)
|
|
|
|
return lp_build_round_sse41(bld, a, LP_BUILD_ROUND_SSE41_TRUNCATE);
|
|
|
|
else {
|
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
|
|
|
LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);
|
|
|
|
LLVMValueRef res;
|
|
|
|
res = LLVMBuildFPToSI(bld->builder, a, int_vec_type, "");
|
|
|
|
res = LLVMBuildSIToFP(bld->builder, res, vec_type, "");
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-09-13 13:50:19 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_round(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-09-13 13:50:19 +01:00
|
|
|
|
|
|
|
assert(type.floating);
|
2009-09-29 16:59:13 +01:00
|
|
|
assert(lp_check_value(type, a));
|
2009-09-13 13:50:19 +01:00
|
|
|
|
2009-09-29 13:58:58 +01:00
|
|
|
if(util_cpu_caps.has_sse4_1)
|
|
|
|
return lp_build_round_sse41(bld, a, LP_BUILD_ROUND_SSE41_NEAREST);
|
2009-09-29 16:59:13 +01:00
|
|
|
else {
|
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
|
|
|
LLVMValueRef res;
|
|
|
|
res = lp_build_iround(bld, a);
|
|
|
|
res = LLVMBuildSIToFP(bld->builder, res, vec_type, "");
|
|
|
|
return res;
|
|
|
|
}
|
2009-09-13 13:50:19 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-09-07 14:26:30 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_floor(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-09-07 14:26:30 +01:00
|
|
|
|
|
|
|
assert(type.floating);
|
|
|
|
|
2009-09-29 13:58:58 +01:00
|
|
|
if(util_cpu_caps.has_sse4_1)
|
|
|
|
return lp_build_round_sse41(bld, a, LP_BUILD_ROUND_SSE41_FLOOR);
|
2009-09-29 16:59:13 +01:00
|
|
|
else {
|
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
|
|
|
LLVMValueRef res;
|
|
|
|
res = lp_build_ifloor(bld, a);
|
|
|
|
res = LLVMBuildSIToFP(bld->builder, res, vec_type, "");
|
|
|
|
return res;
|
|
|
|
}
|
2009-09-07 14:26:30 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-09-13 13:50:19 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_ceil(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-09-13 13:50:19 +01:00
|
|
|
|
|
|
|
assert(type.floating);
|
2009-09-29 16:59:13 +01:00
|
|
|
assert(lp_check_value(type, a));
|
2009-09-13 13:50:19 +01:00
|
|
|
|
2009-09-29 13:58:58 +01:00
|
|
|
if(util_cpu_caps.has_sse4_1)
|
|
|
|
return lp_build_round_sse41(bld, a, LP_BUILD_ROUND_SSE41_CEIL);
|
2009-09-29 16:59:13 +01:00
|
|
|
else {
|
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
|
|
|
LLVMValueRef res;
|
|
|
|
res = lp_build_iceil(bld, a);
|
|
|
|
res = LLVMBuildSIToFP(bld->builder, res, vec_type, "");
|
|
|
|
return res;
|
|
|
|
}
|
2009-09-13 13:50:19 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-09-29 16:59:13 +01:00
|
|
|
/**
|
|
|
|
* Convert to integer, through whichever rounding method that's fastest,
|
2010-02-24 04:16:18 +00:00
|
|
|
* typically truncating toward zero.
|
2009-09-29 16:59:13 +01:00
|
|
|
*/
|
2009-09-13 13:50:19 +01:00
|
|
|
LLVMValueRef
|
2009-09-29 16:59:13 +01:00
|
|
|
lp_build_itrunc(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
2009-09-13 13:50:19 +01:00
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-09-29 16:59:13 +01:00
|
|
|
LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);
|
2009-09-13 13:50:19 +01:00
|
|
|
|
|
|
|
assert(type.floating);
|
2009-09-29 16:59:13 +01:00
|
|
|
assert(lp_check_value(type, a));
|
2009-09-13 13:50:19 +01:00
|
|
|
|
2009-09-29 16:59:13 +01:00
|
|
|
return LLVMBuildFPToSI(bld->builder, a, int_vec_type, "");
|
2009-09-13 13:50:19 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-09-07 14:26:30 +01:00
|
|
|
LLVMValueRef
|
2009-09-29 16:59:13 +01:00
|
|
|
lp_build_iround(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
2009-09-07 14:26:30 +01:00
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-09-07 14:26:30 +01:00
|
|
|
LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);
|
2009-09-29 16:59:13 +01:00
|
|
|
LLVMValueRef res;
|
2009-09-07 14:26:30 +01:00
|
|
|
|
|
|
|
assert(type.floating);
|
2009-09-29 16:59:13 +01:00
|
|
|
assert(lp_check_value(type, a));
|
2009-09-07 14:26:30 +01:00
|
|
|
|
2009-09-29 16:59:13 +01:00
|
|
|
if(util_cpu_caps.has_sse4_1) {
|
|
|
|
res = lp_build_round_sse41(bld, a, LP_BUILD_ROUND_SSE41_NEAREST);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
|
|
|
LLVMValueRef mask = lp_build_int_const_scalar(type, (unsigned long long)1 << (type.width - 1));
|
|
|
|
LLVMValueRef sign;
|
|
|
|
LLVMValueRef half;
|
|
|
|
|
|
|
|
/* get sign bit */
|
|
|
|
sign = LLVMBuildBitCast(bld->builder, a, int_vec_type, "");
|
|
|
|
sign = LLVMBuildAnd(bld->builder, sign, mask, "");
|
|
|
|
|
|
|
|
/* sign * 0.5 */
|
|
|
|
half = lp_build_const_scalar(type, 0.5);
|
|
|
|
half = LLVMBuildBitCast(bld->builder, half, int_vec_type, "");
|
|
|
|
half = LLVMBuildOr(bld->builder, sign, half, "");
|
|
|
|
half = LLVMBuildBitCast(bld->builder, half, vec_type, "");
|
|
|
|
|
|
|
|
res = LLVMBuildAdd(bld->builder, a, half, "");
|
|
|
|
}
|
|
|
|
|
|
|
|
res = LLVMBuildFPToSI(bld->builder, res, int_vec_type, "");
|
|
|
|
|
|
|
|
return res;
|
2009-09-07 14:26:30 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2010-01-13 16:31:36 +00:00
|
|
|
/**
|
|
|
|
* Convert float[] to int[] with floor().
|
|
|
|
*/
|
2009-09-07 14:26:30 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_ifloor(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
2009-09-29 16:59:13 +01:00
|
|
|
const struct lp_type type = bld->type;
|
|
|
|
LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);
|
|
|
|
LLVMValueRef res;
|
|
|
|
|
|
|
|
assert(type.floating);
|
|
|
|
assert(lp_check_value(type, a));
|
|
|
|
|
|
|
|
if(util_cpu_caps.has_sse4_1) {
|
|
|
|
res = lp_build_round_sse41(bld, a, LP_BUILD_ROUND_SSE41_FLOOR);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
/* Take the sign bit and add it to 1 constant */
|
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
|
|
|
unsigned mantissa = lp_mantissa(type);
|
|
|
|
LLVMValueRef mask = lp_build_int_const_scalar(type, (unsigned long long)1 << (type.width - 1));
|
|
|
|
LLVMValueRef sign;
|
|
|
|
LLVMValueRef offset;
|
|
|
|
|
|
|
|
/* sign = a < 0 ? ~0 : 0 */
|
|
|
|
sign = LLVMBuildBitCast(bld->builder, a, int_vec_type, "");
|
|
|
|
sign = LLVMBuildAnd(bld->builder, sign, mask, "");
|
|
|
|
sign = LLVMBuildAShr(bld->builder, sign, lp_build_int_const_scalar(type, type.width - 1), "");
|
2010-01-13 16:31:36 +00:00
|
|
|
lp_build_name(sign, "floor.sign");
|
2009-09-29 16:59:13 +01:00
|
|
|
|
|
|
|
/* offset = -0.99999(9)f */
|
|
|
|
offset = lp_build_const_scalar(type, -(double)(((unsigned long long)1 << mantissa) - 1)/((unsigned long long)1 << mantissa));
|
|
|
|
offset = LLVMConstBitCast(offset, int_vec_type);
|
|
|
|
|
|
|
|
/* offset = a < 0 ? -0.99999(9)f : 0.0f */
|
|
|
|
offset = LLVMBuildAnd(bld->builder, offset, sign, "");
|
|
|
|
offset = LLVMBuildBitCast(bld->builder, offset, vec_type, "");
|
2010-01-13 16:31:36 +00:00
|
|
|
lp_build_name(offset, "floor.offset");
|
2009-09-29 16:59:13 +01:00
|
|
|
|
|
|
|
res = LLVMBuildAdd(bld->builder, a, offset, "");
|
2010-01-13 16:31:36 +00:00
|
|
|
lp_build_name(res, "floor.res");
|
2009-09-29 16:59:13 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
res = LLVMBuildFPToSI(bld->builder, res, int_vec_type, "");
|
2010-01-13 16:31:36 +00:00
|
|
|
lp_build_name(res, "floor");
|
2009-09-29 16:59:13 +01:00
|
|
|
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
LLVMValueRef
|
|
|
|
lp_build_iceil(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
|
|
|
const struct lp_type type = bld->type;
|
|
|
|
LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);
|
|
|
|
LLVMValueRef res;
|
|
|
|
|
|
|
|
assert(type.floating);
|
|
|
|
assert(lp_check_value(type, a));
|
|
|
|
|
|
|
|
if(util_cpu_caps.has_sse4_1) {
|
|
|
|
res = lp_build_round_sse41(bld, a, LP_BUILD_ROUND_SSE41_CEIL);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
assert(0);
|
|
|
|
res = bld->undef;
|
|
|
|
}
|
|
|
|
|
|
|
|
res = LLVMBuildFPToSI(bld->builder, res, int_vec_type, "");
|
|
|
|
|
|
|
|
return res;
|
2009-09-07 14:26:30 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-11 13:09:35 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_sqrt(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-08-11 13:09:35 +01:00
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
2009-08-12 02:34:55 +01:00
|
|
|
char intrinsic[32];
|
2009-08-11 13:09:35 +01:00
|
|
|
|
2009-08-12 02:34:55 +01:00
|
|
|
/* TODO: optimize the constant case */
|
2009-08-11 13:09:35 +01:00
|
|
|
/* TODO: optimize the constant case */
|
|
|
|
|
|
|
|
assert(type.floating);
|
2009-08-12 02:34:55 +01:00
|
|
|
util_snprintf(intrinsic, sizeof intrinsic, "llvm.sqrt.v%uf%u", type.length, type.width);
|
2009-08-11 13:09:35 +01:00
|
|
|
|
|
|
|
return lp_build_intrinsic_unary(bld->builder, intrinsic, vec_type, a);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
LLVMValueRef
|
|
|
|
lp_build_rcp(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-08-11 13:09:35 +01:00
|
|
|
|
|
|
|
if(a == bld->zero)
|
|
|
|
return bld->undef;
|
|
|
|
if(a == bld->one)
|
|
|
|
return bld->one;
|
|
|
|
if(a == bld->undef)
|
|
|
|
return bld->undef;
|
|
|
|
|
|
|
|
assert(type.floating);
|
|
|
|
|
|
|
|
if(LLVMIsConstant(a))
|
|
|
|
return LLVMConstFDiv(bld->one, a);
|
|
|
|
|
2009-09-29 13:58:58 +01:00
|
|
|
if(util_cpu_caps.has_sse && type.width == 32 && type.length == 4)
|
|
|
|
/* FIXME: improve precision */
|
2009-08-11 13:09:35 +01:00
|
|
|
return lp_build_intrinsic_unary(bld->builder, "llvm.x86.sse.rcp.ps", lp_build_vec_type(type), a);
|
|
|
|
|
|
|
|
return LLVMBuildFDiv(bld->builder, bld->one, a, "");
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-19 20:13:49 +01:00
|
|
|
/**
|
|
|
|
* Generate 1/sqrt(a)
|
|
|
|
*/
|
2009-08-11 13:09:35 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_rsqrt(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-08-11 13:09:35 +01:00
|
|
|
|
|
|
|
assert(type.floating);
|
|
|
|
|
2009-09-29 13:58:58 +01:00
|
|
|
if(util_cpu_caps.has_sse && type.width == 32 && type.length == 4)
|
2009-08-11 13:09:35 +01:00
|
|
|
return lp_build_intrinsic_unary(bld->builder, "llvm.x86.sse.rsqrt.ps", lp_build_vec_type(type), a);
|
|
|
|
|
|
|
|
return lp_build_rcp(bld, lp_build_sqrt(bld, a));
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-19 20:13:49 +01:00
|
|
|
/**
|
|
|
|
* Generate cos(a)
|
|
|
|
*/
|
2009-08-11 13:09:35 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_cos(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-08-11 13:09:35 +01:00
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
2009-08-12 02:34:55 +01:00
|
|
|
char intrinsic[32];
|
2009-08-11 13:09:35 +01:00
|
|
|
|
|
|
|
/* TODO: optimize the constant case */
|
|
|
|
|
|
|
|
assert(type.floating);
|
2009-08-12 02:34:55 +01:00
|
|
|
util_snprintf(intrinsic, sizeof intrinsic, "llvm.cos.v%uf%u", type.length, type.width);
|
2009-08-11 13:09:35 +01:00
|
|
|
|
|
|
|
return lp_build_intrinsic_unary(bld->builder, intrinsic, vec_type, a);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-19 20:13:49 +01:00
|
|
|
/**
|
|
|
|
* Generate sin(a)
|
|
|
|
*/
|
2009-08-11 13:09:35 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_sin(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-08-11 13:09:35 +01:00
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
2009-08-12 02:34:55 +01:00
|
|
|
char intrinsic[32];
|
2009-08-11 13:09:35 +01:00
|
|
|
|
|
|
|
/* TODO: optimize the constant case */
|
|
|
|
|
|
|
|
assert(type.floating);
|
2009-08-12 02:34:55 +01:00
|
|
|
util_snprintf(intrinsic, sizeof intrinsic, "llvm.sin.v%uf%u", type.length, type.width);
|
2009-08-11 13:09:35 +01:00
|
|
|
|
|
|
|
return lp_build_intrinsic_unary(bld->builder, intrinsic, vec_type, a);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-19 20:13:49 +01:00
|
|
|
/**
|
|
|
|
* Generate pow(x, y)
|
|
|
|
*/
|
2009-08-11 13:09:35 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_pow(struct lp_build_context *bld,
|
2009-08-12 10:35:50 +01:00
|
|
|
LLVMValueRef x,
|
|
|
|
LLVMValueRef y)
|
2009-08-11 13:09:35 +01:00
|
|
|
{
|
|
|
|
/* TODO: optimize the constant case */
|
2009-08-12 10:35:50 +01:00
|
|
|
if(LLVMIsConstant(x) && LLVMIsConstant(y))
|
2009-09-24 23:08:47 +01:00
|
|
|
debug_printf("%s: inefficient/imprecise constant arithmetic\n",
|
|
|
|
__FUNCTION__);
|
2009-08-11 13:09:35 +01:00
|
|
|
|
2009-08-12 10:35:50 +01:00
|
|
|
return lp_build_exp2(bld, lp_build_mul(bld, lp_build_log2(bld, x), y));
|
2009-08-12 02:34:55 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-19 20:13:49 +01:00
|
|
|
/**
|
|
|
|
* Generate exp(x)
|
|
|
|
*/
|
2009-08-12 02:34:55 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_exp(struct lp_build_context *bld,
|
2009-08-12 10:35:50 +01:00
|
|
|
LLVMValueRef x)
|
2009-08-12 02:34:55 +01:00
|
|
|
{
|
2009-08-12 10:35:50 +01:00
|
|
|
/* log2(e) = 1/log(2) */
|
2009-08-22 22:30:03 +01:00
|
|
|
LLVMValueRef log2e = lp_build_const_scalar(bld->type, 1.4426950408889634);
|
2009-08-12 10:35:50 +01:00
|
|
|
|
|
|
|
return lp_build_mul(bld, log2e, lp_build_exp2(bld, x));
|
2009-08-12 02:34:55 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-19 20:13:49 +01:00
|
|
|
/**
|
|
|
|
* Generate log(x)
|
|
|
|
*/
|
2009-08-12 02:34:55 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_log(struct lp_build_context *bld,
|
2009-08-12 10:35:50 +01:00
|
|
|
LLVMValueRef x)
|
2009-08-12 02:34:55 +01:00
|
|
|
{
|
2009-08-12 10:35:50 +01:00
|
|
|
/* log(2) */
|
2009-12-15 13:58:53 +00:00
|
|
|
LLVMValueRef log2 = lp_build_const_scalar(bld->type, 0.69314718055994529);
|
2009-08-12 10:35:50 +01:00
|
|
|
|
|
|
|
return lp_build_mul(bld, log2, lp_build_exp2(bld, x));
|
2009-08-12 02:34:55 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
#define EXP_POLY_DEGREE 3
|
|
|
|
#define LOG_POLY_DEGREE 5
|
|
|
|
|
|
|
|
|
2009-08-19 20:13:49 +01:00
|
|
|
/**
|
|
|
|
* Generate polynomial.
|
2009-12-15 14:15:52 +00:00
|
|
|
* Ex: coeffs[0] + x * coeffs[1] + x^2 * coeffs[2].
|
2009-08-19 20:13:49 +01:00
|
|
|
*/
|
2009-08-12 02:34:55 +01:00
|
|
|
static LLVMValueRef
|
|
|
|
lp_build_polynomial(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef x,
|
|
|
|
const double *coeffs,
|
|
|
|
unsigned num_coeffs)
|
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-08-12 02:34:55 +01:00
|
|
|
LLVMValueRef res = NULL;
|
|
|
|
unsigned i;
|
|
|
|
|
2009-08-12 10:35:50 +01:00
|
|
|
/* TODO: optimize the constant case */
|
|
|
|
if(LLVMIsConstant(x))
|
2009-09-24 23:08:47 +01:00
|
|
|
debug_printf("%s: inefficient/imprecise constant arithmetic\n",
|
|
|
|
__FUNCTION__);
|
2009-08-12 10:35:50 +01:00
|
|
|
|
2009-08-12 02:34:55 +01:00
|
|
|
for (i = num_coeffs; i--; ) {
|
2009-08-22 22:30:03 +01:00
|
|
|
LLVMValueRef coeff = lp_build_const_scalar(type, coeffs[i]);
|
2009-08-12 02:34:55 +01:00
|
|
|
if(res)
|
|
|
|
res = lp_build_add(bld, coeff, lp_build_mul(bld, x, res));
|
|
|
|
else
|
|
|
|
res = coeff;
|
2009-08-11 13:09:35 +01:00
|
|
|
}
|
|
|
|
|
2009-08-12 02:34:55 +01:00
|
|
|
if(res)
|
|
|
|
return res;
|
|
|
|
else
|
|
|
|
return bld->undef;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-12 10:35:50 +01:00
|
|
|
/**
|
|
|
|
* Minimax polynomial fit of 2**x, in range [-0.5, 0.5[
|
|
|
|
*/
|
|
|
|
const double lp_build_exp2_polynomial[] = {
|
|
|
|
#if EXP_POLY_DEGREE == 5
|
|
|
|
9.9999994e-1, 6.9315308e-1, 2.4015361e-1, 5.5826318e-2, 8.9893397e-3, 1.8775767e-3
|
|
|
|
#elif EXP_POLY_DEGREE == 4
|
|
|
|
1.0000026, 6.9300383e-1, 2.4144275e-1, 5.2011464e-2, 1.3534167e-2
|
|
|
|
#elif EXP_POLY_DEGREE == 3
|
|
|
|
9.9992520e-1, 6.9583356e-1, 2.2606716e-1, 7.8024521e-2
|
|
|
|
#elif EXP_POLY_DEGREE == 2
|
|
|
|
1.0017247, 6.5763628e-1, 3.3718944e-1
|
|
|
|
#else
|
|
|
|
#error
|
|
|
|
#endif
|
|
|
|
};
|
|
|
|
|
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
void
|
|
|
|
lp_build_exp2_approx(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef x,
|
|
|
|
LLVMValueRef *p_exp2_int_part,
|
|
|
|
LLVMValueRef *p_frac_part,
|
|
|
|
LLVMValueRef *p_exp2)
|
2009-08-12 02:34:55 +01:00
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-08-12 10:35:50 +01:00
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
|
|
|
LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);
|
2009-08-16 21:07:15 +01:00
|
|
|
LLVMValueRef ipart = NULL;
|
|
|
|
LLVMValueRef fpart = NULL;
|
|
|
|
LLVMValueRef expipart = NULL;
|
|
|
|
LLVMValueRef expfpart = NULL;
|
|
|
|
LLVMValueRef res = NULL;
|
2009-08-12 10:35:50 +01:00
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
if(p_exp2_int_part || p_frac_part || p_exp2) {
|
|
|
|
/* TODO: optimize the constant case */
|
|
|
|
if(LLVMIsConstant(x))
|
2009-09-24 23:08:47 +01:00
|
|
|
debug_printf("%s: inefficient/imprecise constant arithmetic\n",
|
|
|
|
__FUNCTION__);
|
2009-08-12 10:35:50 +01:00
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
assert(type.floating && type.width == 32);
|
2009-08-12 10:35:50 +01:00
|
|
|
|
2009-08-22 22:30:03 +01:00
|
|
|
x = lp_build_min(bld, x, lp_build_const_scalar(type, 129.0));
|
|
|
|
x = lp_build_max(bld, x, lp_build_const_scalar(type, -126.99999));
|
2009-08-12 10:35:50 +01:00
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
/* ipart = int(x - 0.5) */
|
2009-08-22 22:30:03 +01:00
|
|
|
ipart = LLVMBuildSub(bld->builder, x, lp_build_const_scalar(type, 0.5f), "");
|
2009-08-12 12:42:06 +01:00
|
|
|
ipart = LLVMBuildFPToSI(bld->builder, ipart, int_vec_type, "");
|
2009-08-12 10:35:50 +01:00
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
/* fpart = x - ipart */
|
|
|
|
fpart = LLVMBuildSIToFP(bld->builder, ipart, vec_type, "");
|
|
|
|
fpart = LLVMBuildSub(bld->builder, x, fpart, "");
|
|
|
|
}
|
|
|
|
|
|
|
|
if(p_exp2_int_part || p_exp2) {
|
|
|
|
/* expipart = (float) (1 << ipart) */
|
2009-08-22 22:30:03 +01:00
|
|
|
expipart = LLVMBuildAdd(bld->builder, ipart, lp_build_int_const_scalar(type, 127), "");
|
|
|
|
expipart = LLVMBuildShl(bld->builder, expipart, lp_build_int_const_scalar(type, 23), "");
|
2009-08-12 12:42:06 +01:00
|
|
|
expipart = LLVMBuildBitCast(bld->builder, expipart, vec_type, "");
|
|
|
|
}
|
|
|
|
|
|
|
|
if(p_exp2) {
|
|
|
|
expfpart = lp_build_polynomial(bld, fpart, lp_build_exp2_polynomial,
|
|
|
|
Elements(lp_build_exp2_polynomial));
|
|
|
|
|
|
|
|
res = LLVMBuildMul(bld->builder, expipart, expfpart, "");
|
|
|
|
}
|
2009-08-12 10:35:50 +01:00
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
if(p_exp2_int_part)
|
|
|
|
*p_exp2_int_part = expipart;
|
2009-08-12 10:35:50 +01:00
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
if(p_frac_part)
|
|
|
|
*p_frac_part = fpart;
|
2009-08-12 10:35:50 +01:00
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
if(p_exp2)
|
|
|
|
*p_exp2 = res;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
LLVMValueRef
|
|
|
|
lp_build_exp2(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef x)
|
|
|
|
{
|
|
|
|
LLVMValueRef res;
|
|
|
|
lp_build_exp2_approx(bld, x, NULL, NULL, &res);
|
|
|
|
return res;
|
2009-08-11 13:09:35 +01:00
|
|
|
}
|
|
|
|
|
2009-08-12 02:34:55 +01:00
|
|
|
|
2009-08-12 10:35:50 +01:00
|
|
|
/**
|
|
|
|
* Minimax polynomial fit of log2(x)/(x - 1), for x in range [1, 2[
|
|
|
|
* These coefficients can be generate with
|
|
|
|
* http://www.boost.org/doc/libs/1_36_0/libs/math/doc/sf_and_dist/html/math_toolkit/toolkit/internals2/minimax.html
|
|
|
|
*/
|
|
|
|
const double lp_build_log2_polynomial[] = {
|
|
|
|
#if LOG_POLY_DEGREE == 6
|
|
|
|
3.11578814719469302614, -3.32419399085241980044, 2.59883907202499966007, -1.23152682416275988241, 0.318212422185251071475, -0.0344359067839062357313
|
|
|
|
#elif LOG_POLY_DEGREE == 5
|
|
|
|
2.8882704548164776201, -2.52074962577807006663, 1.48116647521213171641, -0.465725644288844778798, 0.0596515482674574969533
|
|
|
|
#elif LOG_POLY_DEGREE == 4
|
|
|
|
2.61761038894603480148, -1.75647175389045657003, 0.688243882994381274313, -0.107254423828329604454
|
|
|
|
#elif LOG_POLY_DEGREE == 3
|
|
|
|
2.28330284476918490682, -1.04913055217340124191, 0.204446009836232697516
|
|
|
|
#else
|
|
|
|
#error
|
|
|
|
#endif
|
|
|
|
};
|
|
|
|
|
|
|
|
|
2009-08-12 02:34:55 +01:00
|
|
|
/**
|
|
|
|
* See http://www.devmaster.net/forums/showthread.php?p=43580
|
|
|
|
*/
|
2009-08-12 12:42:06 +01:00
|
|
|
void
|
|
|
|
lp_build_log2_approx(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef x,
|
|
|
|
LLVMValueRef *p_exp,
|
|
|
|
LLVMValueRef *p_floor_log2,
|
|
|
|
LLVMValueRef *p_log2)
|
2009-08-12 02:34:55 +01:00
|
|
|
{
|
2009-09-14 11:05:06 +01:00
|
|
|
const struct lp_type type = bld->type;
|
2009-08-12 02:34:55 +01:00
|
|
|
LLVMTypeRef vec_type = lp_build_vec_type(type);
|
|
|
|
LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);
|
|
|
|
|
2009-08-22 22:30:03 +01:00
|
|
|
LLVMValueRef expmask = lp_build_int_const_scalar(type, 0x7f800000);
|
|
|
|
LLVMValueRef mantmask = lp_build_int_const_scalar(type, 0x007fffff);
|
2009-08-12 02:34:55 +01:00
|
|
|
LLVMValueRef one = LLVMConstBitCast(bld->one, int_vec_type);
|
|
|
|
|
2009-08-16 21:07:15 +01:00
|
|
|
LLVMValueRef i = NULL;
|
|
|
|
LLVMValueRef exp = NULL;
|
|
|
|
LLVMValueRef mant = NULL;
|
|
|
|
LLVMValueRef logexp = NULL;
|
|
|
|
LLVMValueRef logmant = NULL;
|
|
|
|
LLVMValueRef res = NULL;
|
2009-08-12 02:34:55 +01:00
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
if(p_exp || p_floor_log2 || p_log2) {
|
|
|
|
/* TODO: optimize the constant case */
|
|
|
|
if(LLVMIsConstant(x))
|
2009-09-24 23:08:47 +01:00
|
|
|
debug_printf("%s: inefficient/imprecise constant arithmetic\n",
|
|
|
|
__FUNCTION__);
|
2009-08-12 10:35:50 +01:00
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
assert(type.floating && type.width == 32);
|
2009-08-12 10:35:50 +01:00
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
i = LLVMBuildBitCast(bld->builder, x, int_vec_type, "");
|
2009-08-12 02:34:55 +01:00
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
/* exp = (float) exponent(x) */
|
|
|
|
exp = LLVMBuildAnd(bld->builder, i, expmask, "");
|
|
|
|
}
|
|
|
|
|
|
|
|
if(p_floor_log2 || p_log2) {
|
2009-08-22 22:30:03 +01:00
|
|
|
logexp = LLVMBuildLShr(bld->builder, exp, lp_build_int_const_scalar(type, 23), "");
|
|
|
|
logexp = LLVMBuildSub(bld->builder, logexp, lp_build_int_const_scalar(type, 127), "");
|
2009-08-12 12:42:06 +01:00
|
|
|
logexp = LLVMBuildSIToFP(bld->builder, logexp, vec_type, "");
|
|
|
|
}
|
2009-08-12 02:34:55 +01:00
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
if(p_log2) {
|
|
|
|
/* mant = (float) mantissa(x) */
|
|
|
|
mant = LLVMBuildAnd(bld->builder, i, mantmask, "");
|
|
|
|
mant = LLVMBuildOr(bld->builder, mant, one, "");
|
2009-12-15 12:13:43 +00:00
|
|
|
mant = LLVMBuildBitCast(bld->builder, mant, vec_type, "");
|
2009-08-12 02:34:55 +01:00
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
logmant = lp_build_polynomial(bld, mant, lp_build_log2_polynomial,
|
|
|
|
Elements(lp_build_log2_polynomial));
|
|
|
|
|
|
|
|
/* This effectively increases the polynomial degree by one, but ensures that log2(1) == 0*/
|
2009-12-15 14:46:43 +00:00
|
|
|
logmant = LLVMBuildMul(bld->builder, logmant, LLVMBuildSub(bld->builder, mant, bld->one, ""), "");
|
2009-08-12 12:42:06 +01:00
|
|
|
|
|
|
|
res = LLVMBuildAdd(bld->builder, logmant, logexp, "");
|
|
|
|
}
|
2009-08-12 02:34:55 +01:00
|
|
|
|
2009-08-12 12:42:06 +01:00
|
|
|
if(p_exp)
|
|
|
|
*p_exp = exp;
|
|
|
|
|
|
|
|
if(p_floor_log2)
|
|
|
|
*p_floor_log2 = logexp;
|
|
|
|
|
|
|
|
if(p_log2)
|
|
|
|
*p_log2 = res;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
LLVMValueRef
|
|
|
|
lp_build_log2(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef x)
|
|
|
|
{
|
|
|
|
LLVMValueRef res;
|
|
|
|
lp_build_log2_approx(bld, x, NULL, NULL, &res);
|
|
|
|
return res;
|
2009-08-12 02:34:55 +01:00
|
|
|
}
|