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-rw-r--r--src/shader_recompiler/frontend/ir/microinstruction.cpp20
1 files changed, 11 insertions, 9 deletions
diff --git a/src/shader_recompiler/frontend/ir/microinstruction.cpp b/src/shader_recompiler/frontend/ir/microinstruction.cpp
index 88e186f21..5946105d2 100644
--- a/src/shader_recompiler/frontend/ir/microinstruction.cpp
+++ b/src/shader_recompiler/frontend/ir/microinstruction.cpp
@@ -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;
- }
+ 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;
}