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glasm: Fix aliased bitcasts ref counting

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This commit is contained in:
ReinUsesLisp 2021-05-17 19:24:09 -03:00 • committed by ameerj
parent f1b334b9f9
commit fb3ba62b3a
3 changed files with 42 additions and 13 deletions
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39
src/shader_recompiler/backend/glasm/reg_alloc.cpp
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@ -30,9 +30,10 @@ Value RegAlloc::Consume(const IR::Value& value) {
}
void RegAlloc::Unref(IR::Inst& inst) {
inst.DestructiveRemoveUsage();
if (!inst.HasUses()) {
Free(inst.Definition<Id>());
IR::Inst& value_inst{AliasInst(inst)};
value_inst.DestructiveRemoveUsage();
if (!value_inst.HasUses()) {
Free(value_inst.Definition<Id>());
}
}
@ -99,10 +100,7 @@ Value RegAlloc::PeekInst(IR::Inst& inst) {
}
Value RegAlloc::ConsumeInst(IR::Inst& inst) {
inst.DestructiveRemoveUsage();
if (!inst.HasUses()) {
Free(inst.Definition<Id>());
}
Unref(inst);
return PeekInst(inst);
}
@ -138,4 +136,31 @@ void RegAlloc::Free(Id id) {
}
}
/*static*/ bool RegAlloc::IsAliased(const IR::Inst& inst) {
switch (inst.GetOpcode()) {
case IR::Opcode::Identity:
case IR::Opcode::BitCastU16F16:
case IR::Opcode::BitCastU32F32:
case IR::Opcode::BitCastU64F64:
case IR::Opcode::BitCastF16U16:
case IR::Opcode::BitCastF32U32:
case IR::Opcode::BitCastF64U64:
return true;
default:
return false;
}
}
/*static*/ IR::Inst& RegAlloc::AliasInst(IR::Inst& inst) {
IR::Inst* it{&inst};
while (IsAliased(*it)) {
const IR::Value arg{it->Arg(0)};
if (arg.IsImmediate()) {
break;
}
it = arg.InstRecursive();
}
return *it;
}
} // namespace Shader::Backend::GLASM