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shader: Fix instruction transitions in and out of Phi

This commit is contained in:
ReinUsesLisp 2021-03-17 01:30:23 -03:00 committed by ameerj
parent fa2f6e38f4
commit 8dd0acfaeb
1 changed files with 11 additions and 9 deletions
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18
src/shader_recompiler/frontend/ir/microinstruction.cpp
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@ -182,7 +182,7 @@ void Inst::AddPhiOperand(Block* predecessor, const Value& value) {
void Inst::Invalidate() {
ClearArgs();
op = Opcode::Void;
ReplaceOpcode(Opcode::Void);
}
void Inst::ClearArgs() {
@ -206,20 +206,22 @@ void Inst::ClearArgs() {
void Inst::ReplaceUsesWith(Value replacement) {
Invalidate();
op = Opcode::Identity;
ReplaceOpcode(Opcode::Identity);
if (!replacement.IsImmediate()) {
Use(replacement);
}
if (op == Opcode::Phi) {
phi_args[0].second = replacement;
} else {
args[0] = replacement;
}
}
void Inst::ReplaceOpcode(IR::Opcode opcode) {
if (opcode == IR::Opcode::Phi) {
throw LogicError("Cannot transition into Phi");
}
if (op == Opcode::Phi) {
// Transition out of phi arguments into non-phi
std::destroy_at(&phi_args);
std::construct_at(&args);
}
op = opcode;
}