shader: Read branch conditions from an instruction

Fixes the identity removal pass.

2 files changed, 11 insertions, 2 deletions

diff --git a/src/shader_recompiler/backend/spirv/emit_spirv.cpp b/src/shader_recompiler/backend/spirv/emit_spirv.cpp
index 9ed2af991..3e20ac3b9 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_spirv.cpp
@@ -469,7 +469,15 @@ Id EmitIdentity(EmitContext& ctx, const IR::Value& value) {
     return id;
 }
 
-void EmitDummyReference(EmitContext&) {}
+Id EmitConditionRef(EmitContext& ctx, const IR::Value& value) {
+    const Id id{ctx.Def(value)};
+    if (!Sirit::ValidId(id)) {
+        throw NotImplementedException("Forward identity declaration");
+    }
+    return id;
+}
+
+void EmitReference(EmitContext&) {}
 
 void EmitPhiMove(EmitContext&) {
     throw LogicError("Unreachable instruction");
diff --git a/src/shader_recompiler/backend/spirv/emit_spirv_instructions.h b/src/shader_recompiler/backend/spirv/emit_spirv_instructions.h
index 22260d2a9..1181e7b4f 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv_instructions.h
+++ b/src/shader_recompiler/backend/spirv/emit_spirv_instructions.h
@@ -23,7 +23,8 @@ class EmitContext;
 Id EmitPhi(EmitContext& ctx, IR::Inst* inst);
 void EmitVoid(EmitContext& ctx);
 Id EmitIdentity(EmitContext& ctx, const IR::Value& value);
-void EmitDummyReference(EmitContext&);
+Id EmitConditionRef(EmitContext& ctx, const IR::Value& value);
+void EmitReference(EmitContext&);
 void EmitPhiMove(EmitContext&);
 void EmitJoin(EmitContext& ctx);
 void EmitDemoteToHelperInvocation(EmitContext& ctx);