shader: Fix instruction transitions in and out of Phi
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@ -182,7 +182,7 @@ void Inst::AddPhiOperand(Block* predecessor, const Value& value) {
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void Inst::Invalidate() {
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ClearArgs();
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op = Opcode::Void;
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ReplaceOpcode(Opcode::Void);
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}
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void Inst::ClearArgs() {
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@ -206,20 +206,22 @@ void Inst::ClearArgs() {
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void Inst::ReplaceUsesWith(Value replacement) {
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Invalidate();
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op = Opcode::Identity;
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ReplaceOpcode(Opcode::Identity);
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if (!replacement.IsImmediate()) {
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Use(replacement);
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}
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if (op == Opcode::Phi) {
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phi_args[0].second = replacement;
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} else {
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args[0] = replacement;
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}
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args[0] = replacement;
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}
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void Inst::ReplaceOpcode(IR::Opcode opcode) {
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if (opcode == IR::Opcode::Phi) {
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throw LogicError("Cannot transition into Phi");
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}
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if (op == Opcode::Phi) {
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// Transition out of phi arguments into non-phi
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std::destroy_at(&phi_args);
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std::construct_at(&args);
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}
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op = opcode;
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}
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