315 lines
8.1 KiB
C
315 lines
8.1 KiB
C
/*
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* Copyright © 2010 Intel Corporation
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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 "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "main/glheader.h"
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#include "main/context.h"
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#include "main/macros.h"
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#include "program.h"
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#include "prog_instruction.h"
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#include "prog_optimize.h"
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#include "prog_parameter.h"
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#include <stdbool.h>
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static bool
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src_regs_are_constant(const struct prog_instruction *inst, unsigned num_srcs)
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{
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unsigned i;
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for (i = 0; i < num_srcs; i++) {
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if (inst->SrcReg[i].File != PROGRAM_CONSTANT)
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return false;
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if (inst->SrcReg[i].RelAddr)
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return false;
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}
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return true;
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}
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static struct prog_src_register
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src_reg_for_float(struct gl_program *prog, float val)
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{
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struct prog_src_register src;
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unsigned swiz;
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memset(&src, 0, sizeof(src));
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src.File = PROGRAM_CONSTANT;
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src.Index = _mesa_add_unnamed_constant(prog->Parameters,
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(gl_constant_value *) &val, 1, &swiz);
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src.Swizzle = swiz;
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return src;
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}
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static struct prog_src_register
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src_reg_for_vec4(struct gl_program *prog, const float *val)
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{
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struct prog_src_register src;
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unsigned swiz;
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memset(&src, 0, sizeof(src));
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src.File = PROGRAM_CONSTANT;
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src.Index = _mesa_add_unnamed_constant(prog->Parameters,
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(gl_constant_value *) val, 4, &swiz);
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src.Swizzle = swiz;
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return src;
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}
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static bool
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src_regs_are_same(const struct prog_src_register *a,
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const struct prog_src_register *b)
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{
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return (a->File == b->File)
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&& (a->Index == b->Index)
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&& (a->Swizzle == b->Swizzle)
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&& (a->Negate == b->Negate)
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&& (a->RelAddr == 0)
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&& (b->RelAddr == 0);
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}
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static void
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get_value(struct gl_program *prog, struct prog_src_register *r, float *data)
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{
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unsigned pvo = prog->Parameters->Parameters[r->Index].ValueOffset;
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const gl_constant_value *const value =
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prog->Parameters->ParameterValues + pvo;
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data[0] = value[GET_SWZ(r->Swizzle, 0)].f;
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data[1] = value[GET_SWZ(r->Swizzle, 1)].f;
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data[2] = value[GET_SWZ(r->Swizzle, 2)].f;
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data[3] = value[GET_SWZ(r->Swizzle, 3)].f;
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if (r->Negate & 0x01) {
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data[0] = -data[0];
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}
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if (r->Negate & 0x02) {
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data[1] = -data[1];
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}
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if (r->Negate & 0x04) {
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data[2] = -data[2];
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}
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if (r->Negate & 0x08) {
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data[3] = -data[3];
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}
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}
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/**
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* Try to replace instructions that produce a constant result with simple moves
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*
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* The hope is that a following copy propagation pass will eliminate the
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* unnecessary move instructions.
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*/
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GLboolean
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_mesa_constant_fold(struct gl_program *prog)
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{
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bool progress = false;
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unsigned i;
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for (i = 0; i < prog->arb.NumInstructions; i++) {
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struct prog_instruction *const inst = &prog->arb.Instructions[i];
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switch (inst->Opcode) {
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case OPCODE_ADD:
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if (src_regs_are_constant(inst, 2)) {
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float a[4];
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float b[4];
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float result[4];
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get_value(prog, &inst->SrcReg[0], a);
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get_value(prog, &inst->SrcReg[1], b);
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result[0] = a[0] + b[0];
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result[1] = a[1] + b[1];
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result[2] = a[2] + b[2];
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result[3] = a[3] + b[3];
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inst->Opcode = OPCODE_MOV;
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inst->SrcReg[0] = src_reg_for_vec4(prog, result);
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inst->SrcReg[1].File = PROGRAM_UNDEFINED;
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inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
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progress = true;
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}
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break;
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case OPCODE_CMP:
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/* FINISHME: We could also optimize CMP instructions where the first
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* FINISHME: source is a constant that is either all < 0.0 or all
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* FINISHME: >= 0.0.
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*/
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if (src_regs_are_constant(inst, 3)) {
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float a[4];
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float b[4];
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float c[4];
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float result[4];
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get_value(prog, &inst->SrcReg[0], a);
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get_value(prog, &inst->SrcReg[1], b);
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get_value(prog, &inst->SrcReg[2], c);
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result[0] = a[0] < 0.0f ? b[0] : c[0];
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result[1] = a[1] < 0.0f ? b[1] : c[1];
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result[2] = a[2] < 0.0f ? b[2] : c[2];
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result[3] = a[3] < 0.0f ? b[3] : c[3];
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inst->Opcode = OPCODE_MOV;
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inst->SrcReg[0] = src_reg_for_vec4(prog, result);
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inst->SrcReg[1].File = PROGRAM_UNDEFINED;
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inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
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inst->SrcReg[2].File = PROGRAM_UNDEFINED;
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inst->SrcReg[2].Swizzle = SWIZZLE_NOOP;
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progress = true;
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}
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break;
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case OPCODE_DP2:
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case OPCODE_DP3:
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case OPCODE_DP4:
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if (src_regs_are_constant(inst, 2)) {
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float a[4];
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float b[4];
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float result;
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get_value(prog, &inst->SrcReg[0], a);
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get_value(prog, &inst->SrcReg[1], b);
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result = (a[0] * b[0]) + (a[1] * b[1]);
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if (inst->Opcode >= OPCODE_DP3)
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result += a[2] * b[2];
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if (inst->Opcode == OPCODE_DP4)
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result += a[3] * b[3];
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inst->Opcode = OPCODE_MOV;
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inst->SrcReg[0] = src_reg_for_float(prog, result);
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inst->SrcReg[1].File = PROGRAM_UNDEFINED;
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inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
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progress = true;
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}
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break;
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case OPCODE_MUL:
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if (src_regs_are_constant(inst, 2)) {
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float a[4];
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float b[4];
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float result[4];
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get_value(prog, &inst->SrcReg[0], a);
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get_value(prog, &inst->SrcReg[1], b);
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result[0] = a[0] * b[0];
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result[1] = a[1] * b[1];
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result[2] = a[2] * b[2];
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result[3] = a[3] * b[3];
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inst->Opcode = OPCODE_MOV;
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inst->SrcReg[0] = src_reg_for_vec4(prog, result);
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inst->SrcReg[1].File = PROGRAM_UNDEFINED;
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inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
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progress = true;
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}
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break;
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case OPCODE_SGE:
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if (src_regs_are_constant(inst, 2)) {
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float a[4];
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float b[4];
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float result[4];
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get_value(prog, &inst->SrcReg[0], a);
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get_value(prog, &inst->SrcReg[1], b);
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result[0] = (a[0] >= b[0]) ? 1.0f : 0.0f;
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result[1] = (a[1] >= b[1]) ? 1.0f : 0.0f;
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result[2] = (a[2] >= b[2]) ? 1.0f : 0.0f;
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result[3] = (a[3] >= b[3]) ? 1.0f : 0.0f;
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inst->Opcode = OPCODE_MOV;
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inst->SrcReg[0] = src_reg_for_vec4(prog, result);
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inst->SrcReg[1].File = PROGRAM_UNDEFINED;
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inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
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progress = true;
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} else if (src_regs_are_same(&inst->SrcReg[0], &inst->SrcReg[1])) {
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inst->Opcode = OPCODE_MOV;
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inst->SrcReg[0] = src_reg_for_float(prog, 1.0f);
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inst->SrcReg[1].File = PROGRAM_UNDEFINED;
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inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
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progress = true;
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}
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break;
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case OPCODE_SLT:
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if (src_regs_are_constant(inst, 2)) {
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float a[4];
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float b[4];
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float result[4];
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get_value(prog, &inst->SrcReg[0], a);
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get_value(prog, &inst->SrcReg[1], b);
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result[0] = (a[0] < b[0]) ? 1.0f : 0.0f;
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result[1] = (a[1] < b[1]) ? 1.0f : 0.0f;
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result[2] = (a[2] < b[2]) ? 1.0f : 0.0f;
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result[3] = (a[3] < b[3]) ? 1.0f : 0.0f;
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inst->Opcode = OPCODE_MOV;
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inst->SrcReg[0] = src_reg_for_vec4(prog, result);
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inst->SrcReg[1].File = PROGRAM_UNDEFINED;
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inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
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progress = true;
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} else if (src_regs_are_same(&inst->SrcReg[0], &inst->SrcReg[1])) {
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inst->Opcode = OPCODE_MOV;
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inst->SrcReg[0] = src_reg_for_float(prog, 0.0f);
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inst->SrcReg[1].File = PROGRAM_UNDEFINED;
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inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
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progress = true;
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}
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break;
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default:
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break;
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}
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}
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return progress;
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}
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