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