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/*
* Copyright (C) 2008 Nicolai Haehnle.
*
* All Rights Reserved.
*
* 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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.
*
*/
/**
* @file
*
* "Not-quite SSA" and Dead-Code Elimination.
*
* @note This code uses SWIZZLE_NIL in a source register to indicate that
* the corresponding component is ignored by the corresponding instruction.
*/
#include "radeon_nqssadce.h"
/**
* Return the @ref register_state for the given register (or 0 for untracked
* registers, i.e. constants).
*/
static struct register_state *get_reg_state(struct nqssadce_state* s, GLuint file, GLuint index)
{
switch(file) {
case PROGRAM_TEMPORARY: return &s->Temps[index];
case PROGRAM_OUTPUT: return &s->Outputs[index];
default: return 0;
}
}
/**
* Left multiplication of a register with a swizzle
*
* @note Works correctly only for X, Y, Z, W swizzles, not for constant swizzles.
*/
static struct prog_src_register lmul_swizzle(GLuint swizzle, struct prog_src_register srcreg)
{
struct prog_src_register tmp = srcreg;
int i;
tmp.Swizzle = 0;
tmp.NegateBase = 0;
for(i = 0; i < 4; ++i) {
GLuint swz = GET_SWZ(swizzle, i);
if (swz < 4) {
tmp.Swizzle |= GET_SWZ(srcreg.Swizzle, swz) << (i*3);
tmp.NegateBase |= GET_BIT(srcreg.NegateBase, swz) << i;
} else {
tmp.Swizzle |= swz << (i*3);
}
}
return tmp;
}
static struct prog_instruction* track_used_srcreg(struct nqssadce_state* s,
struct prog_instruction *inst, GLint src, GLuint sourced)
{
int i;
GLuint deswz_source = 0;
for(i = 0; i < 4; ++i) {
if (GET_BIT(sourced, i)) {
GLuint swz = GET_SWZ(inst->SrcReg[src].Swizzle, i);
deswz_source |= 1 << swz;
} else {
inst->SrcReg[src].Swizzle &= ~(7 << (3*i));
inst->SrcReg[src].Swizzle |= SWIZZLE_NIL << (3*i);
}
}
if (!s->Descr->IsNativeSwizzle(inst->Opcode, inst->SrcReg[src])) {
struct prog_dst_register dstreg = inst->DstReg;
dstreg.File = PROGRAM_TEMPORARY;
dstreg.Index = _mesa_find_free_register(s->Program, PROGRAM_TEMPORARY);
dstreg.WriteMask = sourced;
s->Descr->BuildSwizzle(s, dstreg, inst->SrcReg[src]);
inst = s->Program->Instructions + s->IP;
inst->SrcReg[src].File = PROGRAM_TEMPORARY;
inst->SrcReg[src].Index = dstreg.Index;
inst->SrcReg[src].Swizzle = 0;
inst->SrcReg[src].NegateBase = 0;
inst->SrcReg[src].Abs = 0;
inst->SrcReg[src].NegateAbs = 0;
for(i = 0; i < 4; ++i) {
if (GET_BIT(sourced, i))
inst->SrcReg[src].Swizzle |= i << (3*i);
else
inst->SrcReg[src].Swizzle |= SWIZZLE_NIL << (3*i);
}
deswz_source = sourced;
}
struct register_state *regstate = get_reg_state(s, inst->SrcReg[src].File, inst->SrcReg[src].Index);
if (regstate)
regstate->Sourced |= deswz_source & 0xf;
return inst;
}
static void rewrite_depth_out(struct prog_instruction *inst)
{
if (inst->DstReg.WriteMask & WRITEMASK_Z) {
inst->DstReg.WriteMask = WRITEMASK_W;
} else {
inst->DstReg.WriteMask = 0;
return;
}
switch (inst->Opcode) {
case OPCODE_FRC:
case OPCODE_MOV:
inst->SrcReg[0] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[0]);
break;
case OPCODE_ADD:
case OPCODE_MAX:
case OPCODE_MIN:
case OPCODE_MUL:
inst->SrcReg[0] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[0]);
inst->SrcReg[1] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[1]);
break;
case OPCODE_CMP:
case OPCODE_MAD:
inst->SrcReg[0] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[0]);
inst->SrcReg[1] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[1]);
inst->SrcReg[2] = lmul_swizzle(SWIZZLE_ZZZZ, inst->SrcReg[2]);
break;
default:
// Scalar instructions needn't be reswizzled
break;
}
}
static void unalias_srcregs(struct prog_instruction *inst, GLuint oldindex, GLuint newindex)
{
int nsrc = _mesa_num_inst_src_regs(inst->Opcode);
int i;
for(i = 0; i < nsrc; ++i)
if (inst->SrcReg[i].File == PROGRAM_TEMPORARY && inst->SrcReg[i].Index == oldindex)
inst->SrcReg[i].Index = newindex;
}
static void unalias_temporary(struct nqssadce_state* s, GLuint oldindex)
{
GLuint newindex = _mesa_find_free_register(s->Program, PROGRAM_TEMPORARY);
int ip;
for(ip = 0; ip < s->IP; ++ip) {
struct prog_instruction* inst = s->Program->Instructions + ip;
if (inst->DstReg.File == PROGRAM_TEMPORARY && inst->DstReg.Index == oldindex)
inst->DstReg.Index = newindex;
unalias_srcregs(inst, oldindex, newindex);
}
unalias_srcregs(s->Program->Instructions + s->IP, oldindex, newindex);
}
/**
* Handle one instruction.
*/
static void process_instruction(struct nqssadce_state* s)
{
struct prog_instruction *inst = s->Program->Instructions + s->IP;
if (inst->Opcode == OPCODE_END)
return;
if (inst->Opcode != OPCODE_KIL) {
if (s->Descr->RewriteDepthOut) {
if (inst->DstReg.File == PROGRAM_OUTPUT && inst->DstReg.Index == FRAG_RESULT_DEPR)
rewrite_depth_out(inst);
}
struct register_state *regstate = get_reg_state(s, inst->DstReg.File, inst->DstReg.Index);
if (!regstate) {
_mesa_problem(s->Ctx, "NqssaDce: bad destination register (%i[%i])\n",
inst->DstReg.File, inst->DstReg.Index);
return;
}
inst->DstReg.WriteMask &= regstate->Sourced;
regstate->Sourced &= ~inst->DstReg.WriteMask;
if (inst->DstReg.WriteMask == 0) {
_mesa_delete_instructions(s->Program, s->IP, 1);
return;
}
if (inst->DstReg.File == PROGRAM_TEMPORARY && !regstate->Sourced)
unalias_temporary(s, inst->DstReg.Index);
}
/* Attention: Due to swizzle emulation code, the following
* might change the instruction stream under us, so we have
* to be careful with the inst pointer. */
switch (inst->Opcode) {
case OPCODE_DDX:
case OPCODE_DDY:
case OPCODE_FRC:
case OPCODE_MOV:
inst = track_used_srcreg(s, inst, 0, inst->DstReg.WriteMask);
break;
case OPCODE_ADD:
case OPCODE_MAX:
case OPCODE_MIN:
case OPCODE_MUL:
inst = track_used_srcreg(s, inst, 0, inst->DstReg.WriteMask);
inst = track_used_srcreg(s, inst, 1, inst->DstReg.WriteMask);
break;
case OPCODE_CMP:
case OPCODE_MAD:
inst = track_used_srcreg(s, inst, 0, inst->DstReg.WriteMask);
inst = track_used_srcreg(s, inst, 1, inst->DstReg.WriteMask);
inst = track_used_srcreg(s, inst, 2, inst->DstReg.WriteMask);
break;
case OPCODE_COS:
case OPCODE_EX2:
case OPCODE_LG2:
case OPCODE_RCP:
case OPCODE_RSQ:
case OPCODE_SIN:
inst = track_used_srcreg(s, inst, 0, 0x1);
break;
case OPCODE_DP3:
inst = track_used_srcreg(s, inst, 0, 0x7);
inst = track_used_srcreg(s, inst, 1, 0x7);
break;
case OPCODE_DP4:
inst = track_used_srcreg(s, inst, 0, 0xf);
inst = track_used_srcreg(s, inst, 1, 0xf);
break;
case OPCODE_KIL:
case OPCODE_TEX:
case OPCODE_TXB:
case OPCODE_TXP:
inst = track_used_srcreg(s, inst, 0, 0xf);
break;
default:
_mesa_problem(s->Ctx, "NqssaDce: Unknown opcode %d\n", inst->Opcode);
return;
}
}
void radeonNqssaDce(GLcontext *ctx, struct gl_program *p, struct radeon_nqssadce_descr* descr)
{
struct nqssadce_state s;
_mesa_bzero(&s, sizeof(s));
s.Ctx = ctx;
s.Program = p;
s.Descr = descr;
s.Descr->Init(&s);
s.IP = p->NumInstructions;
while(s.IP > 0) {
s.IP--;
process_instruction(&s);
}
}
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