================
@@ -3356,6 +3356,37 @@ struct MemorySanitizerVisitor : public
InstVisitor<MemorySanitizerVisitor> {
setOriginForNaryOp(I);
}
+ Value *convertBlendvToSelectMask(IRBuilder<> &IRB, Value *C) {
+ C = CreateAppToShadowCast(IRB, C);
+ FixedVectorType *FVT = cast<FixedVectorType>(C->getType());
+ unsigned ElSize = FVT->getElementType()->getPrimitiveSizeInBits();
+ C = IRB.CreateAShr(C, ElSize - 1);
+ FVT = FixedVectorType::get(IRB.getInt1Ty(), FVT->getNumElements());
+ return IRB.CreateTrunc(C, FVT);
+ }
+
+ // `blendv(f, t, c)` is effectively `select(c[top_bit], t, f)`.
+ void handleBlendvIntrinsic(IntrinsicInst &I) {
+ Value *C = I.getOperand(2);
+ Value *T = I.getOperand(1);
+ Value *F = I.getOperand(0);
+
+ Value *Sc = getShadow(&I, 2);
+ Value *Oc = MS.TrackOrigins ? getOrigin(C) : nullptr;
+
+ {
+ IRBuilder<> IRB(&I);
----------------
fmayer wrote:
Why does it matter that this doesn't outlive `handleSelectLikeInst`? Because
that also creates an IRBuilder? How does that work? That creates it from `&I`
as well, which means these instructions get inserted before the ones here,
right?
https://github.com/llvm/llvm-project/pull/94882
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