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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2009-08-12 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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2009-08-01 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 defined(PIPE_ARCH_X86) || defined(PIPE_ARCH_X86_64)
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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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2009-08-02 17:54:53 +01:00
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if(type.width == 32)
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intrinsic = "llvm.x86.sse.min.ps";
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if(type.width == 64)
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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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if(type.width == 8 && !type.sign)
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intrinsic = "llvm.x86.sse2.pminu.b";
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2009-08-08 22:57:03 +01:00
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if(type.width == 8 && type.sign)
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intrinsic = "llvm.x86.sse41.pminsb";
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if(type.width == 16 && !type.sign)
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intrinsic = "llvm.x86.sse41.pminuw";
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2009-08-02 17:54:53 +01:00
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if(type.width == 16 && type.sign)
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intrinsic = "llvm.x86.sse2.pmins.w";
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2009-08-08 22:57:03 +01:00
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if(type.width == 32 && !type.sign)
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intrinsic = "llvm.x86.sse41.pminud";
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if(type.width == 32 && type.sign)
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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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#endif
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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";
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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 = LLVMConstSub(a, b);
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else
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res = LLVMBuildSub(bld->builder, a, b, "");
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if(bld->type.norm && (bld->type.floating || bld->type.fixed))
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res = lp_build_max_simple(bld, res, bld->zero);
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|
|
|
|
return res;
|
2009-08-01 17:27:05 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-03 00:01:27 +01:00
|
|
|
/**
|
|
|
|
* Build shuffle vectors that match PUNPCKLxx and PUNPCKHxx instructions.
|
|
|
|
*/
|
|
|
|
static LLVMValueRef
|
|
|
|
lp_build_unpack_shuffle(unsigned n, unsigned lo_hi)
|
|
|
|
{
|
|
|
|
LLVMValueRef elems[LP_MAX_VECTOR_LENGTH];
|
|
|
|
unsigned i, j;
|
|
|
|
|
|
|
|
assert(n <= LP_MAX_VECTOR_LENGTH);
|
|
|
|
assert(lo_hi < 2);
|
|
|
|
|
|
|
|
for(i = 0, j = lo_hi*n/2; i < n; i += 2, ++j) {
|
|
|
|
elems[i + 0] = LLVMConstInt(LLVMInt32Type(), 0 + j, 0);
|
|
|
|
elems[i + 1] = LLVMConstInt(LLVMInt32Type(), n + j, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
return LLVMConstVector(elems, n);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-08-19 20:13:49 +01:00
|
|
|
/**
|
|
|
|
* Build constant int vector of width 'n' and value 'c'.
|
|
|
|
*/
|
2009-08-03 00:01:27 +01:00
|
|
|
static LLVMValueRef
|
|
|
|
lp_build_const_vec(LLVMTypeRef type, unsigned n, long long c)
|
|
|
|
{
|
|
|
|
LLVMValueRef elems[LP_MAX_VECTOR_LENGTH];
|
|
|
|
unsigned i;
|
|
|
|
|
|
|
|
assert(n <= LP_MAX_VECTOR_LENGTH);
|
|
|
|
|
|
|
|
for(i = 0; i < n; ++i)
|
|
|
|
elems[i] = LLVMConstInt(type, c, 0);
|
|
|
|
|
|
|
|
return LLVMConstVector(elems, n);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* 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,
|
|
|
|
LLVMValueRef a, LLVMValueRef b)
|
|
|
|
{
|
|
|
|
static LLVMValueRef c01 = NULL;
|
|
|
|
static LLVMValueRef c08 = NULL;
|
|
|
|
static LLVMValueRef c80 = NULL;
|
|
|
|
LLVMValueRef ab;
|
|
|
|
|
|
|
|
if(!c01) c01 = lp_build_const_vec(LLVMInt16Type(), 8, 0x01);
|
|
|
|
if(!c08) c08 = lp_build_const_vec(LLVMInt16Type(), 8, 0x08);
|
|
|
|
if(!c80) c80 = lp_build_const_vec(LLVMInt16Type(), 8, 0x80);
|
|
|
|
|
|
|
|
#if 0
|
|
|
|
|
|
|
|
/* a*b/255 ~= (a*(b + 1)) >> 256 */
|
|
|
|
b = LLVMBuildAdd(builder, b, c01, "");
|
|
|
|
ab = LLVMBuildMul(builder, a, b, "");
|
|
|
|
|
|
|
|
#else
|
|
|
|
|
|
|
|
/* t/255 ~= (t + (t >> 8) + 0x80) >> 8 */
|
|
|
|
ab = LLVMBuildMul(builder, a, b, "");
|
|
|
|
ab = LLVMBuildAdd(builder, ab, LLVMBuildLShr(builder, ab, c08, ""), "");
|
|
|
|
ab = LLVMBuildAdd(builder, ab, c80, "");
|
|
|
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
ab = LLVMBuildLShr(builder, ab, c08, "");
|
|
|
|
|
|
|
|
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;
|
2009-08-03 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) {
|
2009-09-29 13:58:58 +01:00
|
|
|
if(util_cpu_caps.has_sse2 && type.width == 8 && type.length == 16) {
|
2009-08-03 00:01:27 +01:00
|
|
|
LLVMTypeRef i16x8 = LLVMVectorType(LLVMInt16Type(), 8);
|
|
|
|
LLVMTypeRef i8x16 = LLVMVectorType(LLVMInt8Type(), 16);
|
|
|
|
static LLVMValueRef ml = NULL;
|
|
|
|
static LLVMValueRef mh = NULL;
|
|
|
|
LLVMValueRef al, ah, bl, bh;
|
|
|
|
LLVMValueRef abl, abh;
|
|
|
|
LLVMValueRef ab;
|
|
|
|
|
|
|
|
if(!ml) ml = lp_build_unpack_shuffle(16, 0);
|
|
|
|
if(!mh) mh = lp_build_unpack_shuffle(16, 1);
|
|
|
|
|
|
|
|
/* PUNPCKLBW, PUNPCKHBW */
|
|
|
|
al = LLVMBuildShuffleVector(bld->builder, a, bld->zero, ml, "");
|
|
|
|
bl = LLVMBuildShuffleVector(bld->builder, b, bld->zero, ml, "");
|
|
|
|
ah = LLVMBuildShuffleVector(bld->builder, a, bld->zero, mh, "");
|
|
|
|
bh = LLVMBuildShuffleVector(bld->builder, b, bld->zero, mh, "");
|
|
|
|
|
|
|
|
/* NOP */
|
|
|
|
al = LLVMBuildBitCast(bld->builder, al, i16x8, "");
|
|
|
|
bl = LLVMBuildBitCast(bld->builder, bl, i16x8, "");
|
|
|
|
ah = LLVMBuildBitCast(bld->builder, ah, i16x8, "");
|
|
|
|
bh = LLVMBuildBitCast(bld->builder, bh, i16x8, "");
|
|
|
|
|
|
|
|
/* PMULLW, PSRLW, PADDW */
|
|
|
|
abl = lp_build_mul_u8n(bld->builder, al, bl);
|
|
|
|
abh = lp_build_mul_u8n(bld->builder, ah, bh);
|
|
|
|
|
|
|
|
/* PACKUSWB */
|
2009-08-07 01:16:59 +01:00
|
|
|
ab = lp_build_intrinsic_binary(bld->builder, "llvm.x86.sse2.packuswb.128" , i16x8, abl, abh);
|
2009-08-03 00:01:27 +01:00
|
|
|
|
|
|
|
/* NOP */
|
|
|
|
ab = LLVMBuildBitCast(bld->builder, ab, i8x16, "");
|
|
|
|
|
|
|
|
return ab;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* FIXME */
|
|
|
|
assert(0);
|
|
|
|
}
|
|
|
|
|
2009-08-02 17:54:53 +01:00
|
|
|
if(LLVMIsConstant(a) && LLVMIsConstant(b))
|
|
|
|
return LLVMConstMul(a, b);
|
|
|
|
|
|
|
|
return LLVMBuildMul(bld->builder, a, b, "");
|
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, "");
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-09-07 14:27:06 +01:00
|
|
|
LLVMValueRef
|
|
|
|
lp_build_lerp(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef x,
|
|
|
|
LLVMValueRef v0,
|
|
|
|
LLVMValueRef v1)
|
|
|
|
{
|
|
|
|
return lp_build_add(bld, v0, lp_build_mul(bld, x, lp_build_sub(bld, v1, v0)));
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
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
|
|
|
|
|
|
|
|
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);
|
|
|
|
LLVMValueRef mask = lp_build_int_const_scalar(type, ((unsigned long long)1 << type.width) - 1);
|
|
|
|
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, ""));
|
|
|
|
}
|
|
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
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);
|
|
|
|
|
|
|
|
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));
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-09-13 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 13:58:58 +01:00
|
|
|
if(util_cpu_caps.has_sse4_1)
|
|
|
|
return lp_build_round_sse41(bld, a, LP_BUILD_ROUND_SSE41_NEAREST);
|
2009-09-13 13:50:19 +01:00
|
|
|
|
|
|
|
/* FIXME */
|
|
|
|
assert(0);
|
|
|
|
return bld->undef;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
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);
|
2009-09-07 14:26:30 +01:00
|
|
|
|
|
|
|
/* FIXME */
|
|
|
|
assert(0);
|
|
|
|
return bld->undef;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
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 13:58:58 +01:00
|
|
|
if(util_cpu_caps.has_sse4_1)
|
|
|
|
return lp_build_round_sse41(bld, a, LP_BUILD_ROUND_SSE41_CEIL);
|
2009-09-13 13:50:19 +01:00
|
|
|
|
|
|
|
/* FIXME */
|
|
|
|
assert(0);
|
|
|
|
return bld->undef;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
LLVMValueRef
|
|
|
|
lp_build_trunc(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 13:58:58 +01:00
|
|
|
if(util_cpu_caps.has_sse4_1)
|
|
|
|
return lp_build_round_sse41(bld, a, LP_BUILD_ROUND_SSE41_TRUNCATE);
|
2009-09-13 13:50:19 +01:00
|
|
|
|
|
|
|
/* FIXME */
|
|
|
|
assert(0);
|
|
|
|
return bld->undef;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2009-09-07 14:26:30 +01:00
|
|
|
/**
|
|
|
|
* Convert to integer, through whichever rounding method that's fastest,
|
|
|
|
* typically truncating to zero.
|
|
|
|
*/
|
|
|
|
LLVMValueRef
|
|
|
|
lp_build_int(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
|
|
|
LLVMTypeRef int_vec_type = lp_build_int_vec_type(type);
|
|
|
|
|
|
|
|
assert(type.floating);
|
|
|
|
|
|
|
|
return LLVMBuildFPToSI(bld->builder, a, int_vec_type, "");
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
LLVMValueRef
|
|
|
|
lp_build_ifloor(struct lp_build_context *bld,
|
|
|
|
LLVMValueRef a)
|
|
|
|
{
|
|
|
|
a = lp_build_floor(bld, a);
|
|
|
|
a = lp_build_int(bld, a);
|
|
|
|
return a;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
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) */
|
2009-08-22 22:30:03 +01:00
|
|
|
LLVMValueRef log2 = lp_build_const_scalar(bld->type, 1.4426950408889634);
|
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.
|
|
|
|
* Ex: x^2 * coeffs[0] + x * coeffs[1] + coeffs[2].
|
|
|
|
*/
|
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, "");
|
|
|
|
mant = LLVMBuildSIToFP(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*/
|
|
|
|
logmant = LLVMBuildMul(bld->builder, logmant, LLVMBuildMul(bld->builder, mant, bld->one, ""), "");
|
|
|
|
|
|
|
|
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
|
|
|
}
|