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spirv: Add support for self-referencing phi nodes

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This commit is contained in:
ReinUsesLisp 2021-02-24 18:31:32 -03:00 committed by ameerj
parent e87a502da2
commit 7496bbf758
1 changed files with 10 additions and 3 deletions
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9
src/shader_recompiler/backend/spirv/emit_spirv.cpp
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@ -217,11 +217,18 @@ Id EmitPhi(EmitContext& ctx, IR::Inst* inst) {
IR::Inst* const arg_inst{arg.Inst()};
def = arg_inst->Definition<Id>();
if (!Sirit::ValidId(def)) {
// If it hasn't been defined, get a forward declaration
if (arg_inst == inst) {
// This is a self referencing phi node
def = ctx.CurrentId();
// Self-referencing definition will be set by the caller
} else {
// If it hasn't been defined and it's not a self reference,
// get a forward declaration
def = ctx.ForwardDeclarationId();
arg_inst->SetDefinition<Id>(def);
}
}
}
IR::Block* const phi_block{inst->PhiBlock(index)};
operands.push_back(def);
operands.push_back(phi_block->Definition<Id>());