================
@@ -4689,6 +4719,32 @@ void CodeGenFunction::EmitCallArg(CallArgList &args,
const Expr *E,
assert(type->isReferenceType() == E->isGLValue() &&
"reference binding to unmaterialized r-value!");
+ // Add writeback for HLSLOutParamExpr.
+ if (const HLSLOutArgExpr *OE = dyn_cast<HLSLOutArgExpr>(E)) {
+ LValue LV = EmitLValue(E);
+ llvm::Type *ElTy = ConvertTypeForMem(LV.getType());
+ llvm::Value *Addr, *BaseAddr;
+ if (LV.isExtVectorElt()) {
+ llvm::Constant *VecElts = LV.getExtVectorElts();
+ BaseAddr = LV.getExtVectorAddress().getBasePointer();
+ Addr = Builder.CreateGEP(
+ ElTy, BaseAddr,
+ {Builder.getInt32(0), VecElts->getAggregateElement((unsigned)0)});
+ } else // LV.getAddress() will assert if this is not a simple LValue.
+ Addr = BaseAddr = LV.getAddress().getBasePointer();
+
+ llvm::TypeSize Sz =
+ CGM.getDataLayout().getTypeAllocSize(ConvertTypeForMem(LV.getType()));
+
+ llvm::Value *LifetimeSize = EmitLifetimeStart(Sz, BaseAddr);
+
+ Address TmpAddr(Addr, ElTy, LV.getAlignment());
+ // TODO-HLSLOutArgExp: Fix me!!!
----------------
llvm-beanz wrote:
Doh. I think that's just a stale comment, but let me verify that all the test
coverage is correct.
https://github.com/llvm/llvm-project/pull/101083
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