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shader: Fold composite extract

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FernandoS27 2021-04-01 07:42:58 +02:00 committed by ameerj
parent c3bace756f
commit bee8188799
1 changed files with 62 additions and 0 deletions
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62
src/shader_recompiler/ir_opt/constant_propagation_pass.cpp
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@ -368,6 +368,50 @@ void FoldBranchConditional(IR::Inst& inst) {
}
}
std::optional<IR::Value> FoldCompositeExtractImpl(IR::Value inst_value, IR::Opcode insert,
IR::Opcode construct, u32 first_index) {
IR::Inst* const inst{inst_value.InstRecursive()};
if (inst->Opcode() == construct) {
return inst->Arg(first_index);
}
if (inst->Opcode() != insert) {
return std::nullopt;
}
IR::Value value_index{inst->Arg(2)};
if (!value_index.IsImmediate()) {
return std::nullopt;
}
const u32 second_index = value_index.U32();
if (first_index != second_index) {
IR::Value value_composite{inst->Arg(0)};
if (value_composite.IsImmediate()) {
return std::nullopt;
}
return FoldCompositeExtractImpl(value_composite, insert, construct, first_index);
}
return inst->Arg(1);
}
void FoldCompositeExtract(IR::Inst& inst, IR::Opcode construct, IR::Opcode insert) {
const IR::Value value_1{inst.Arg(0)};
const IR::Value value_2{inst.Arg(1)};
if (value_1.IsImmediate()) {
return;
}
if (!value_2.IsImmediate()) {
return;
}
const u32 first_index = value_2.U32();
auto result = FoldCompositeExtractImpl(value_1, insert, construct, first_index);
if (!result) {
return;
}
inst.ReplaceUsesWith(*result);
}
void ConstantPropagation(IR::Block& block, IR::Inst& inst) {
switch (inst.Opcode()) {
case IR::Opcode::GetRegister:
@ -458,6 +502,24 @@ void ConstantPropagation(IR::Block& block, IR::Inst& inst) {
return;
case IR::Opcode::BranchConditional:
return FoldBranchConditional(inst);
case IR::Opcode::CompositeExtractF32x2:
return FoldCompositeExtract(inst, IR::Opcode::CompositeConstructF32x2,
IR::Opcode::CompositeInsertF32x2);
case IR::Opcode::CompositeExtractF32x3:
return FoldCompositeExtract(inst, IR::Opcode::CompositeConstructF32x3,
IR::Opcode::CompositeInsertF32x3);
case IR::Opcode::CompositeExtractF32x4:
return FoldCompositeExtract(inst, IR::Opcode::CompositeConstructF32x4,
IR::Opcode::CompositeInsertF32x4);
case IR::Opcode::CompositeExtractF16x2:
return FoldCompositeExtract(inst, IR::Opcode::CompositeConstructF16x2,
IR::Opcode::CompositeInsertF16x2);
case IR::Opcode::CompositeExtractF16x3:
return FoldCompositeExtract(inst, IR::Opcode::CompositeConstructF16x3,
IR::Opcode::CompositeInsertF16x3);
case IR::Opcode::CompositeExtractF16x4:
return FoldCompositeExtract(inst, IR::Opcode::CompositeConstructF16x4,
IR::Opcode::CompositeInsertF16x4);
default:
break;
}