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aco: optimize packed clamp

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Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6680>
This commit is contained in:
Daniel Schürmann 2020-09-11 15:54:39 +01:00 • committed by Marge Bot
parent a9fd9187e8
commit e3790fc458
1 changed files with 21 additions and 2 deletions
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23
src/amd/compiler/aco_optimizer.cpp
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@ -2728,7 +2728,27 @@ bool combine_add_lshl(opt_ctx& ctx, aco_ptr<Instruction>& instr)
void combine_vop3p(opt_ctx &ctx, Block& block, aco_ptr<Instruction>& instr)
{
// TODO: clamp, fneg?
VOP3P_instruction* vop3p = static_cast<VOP3P_instruction*>(instr.get());
/* apply clamp */
if (instr->opcode == aco_opcode::v_pk_mul_f16 &&
instr->operands[1].constantEquals(0x3C00) &&
vop3p->clamp &&
vop3p->opsel_lo == 0x0 &&
vop3p->opsel_hi == 0x1 &&
instr->operands[0].isTemp() &&
ctx.uses[instr->operands[0].tempId()] == 1) {
ssa_info& info = ctx.info[instr->operands[0].tempId()];
if (info.is_vop3p() && instr_info.can_use_output_modifiers[(int)info.instr->opcode]) {
Instruction* candidate = ctx.info[instr->operands[0].tempId()].instr;
static_cast<VOP3P_instruction*>(candidate)->clamp = true;
std::swap(instr->definitions[0], candidate->definitions[0]);
ctx.info[candidate->definitions[0].tempId()].instr = candidate;
ctx.uses[instr->definitions[0].tempId()]--;
return;
}
}
if (instr->opcode == aco_opcode::v_pk_add_f16) {
if (instr->definitions[0].isPrecise())
@ -2781,7 +2801,6 @@ void combine_vop3p(opt_ctx &ctx, Block& block, aco_ptr<Instruction>& instr)
assert(mul_instr->format == Format::VOP3P);
aco_ptr<VOP3P_instruction> fma{create_instruction<VOP3P_instruction>(aco_opcode::v_pk_fma_f16, Format::VOP3P, 3, 1)};
VOP3P_instruction* mul = static_cast<VOP3P_instruction*>(mul_instr);
VOP3P_instruction* vop3p = static_cast<VOP3P_instruction*>(instr.get());
for (unsigned i = 0; i < 2; i++) {
fma->operands[i] = op[i];
fma->neg_lo[i] = mul->neg_lo[i];