================
@@ -3287,6 +3287,76 @@ struct MemorySanitizerVisitor : public
InstVisitor<MemorySanitizerVisitor> {
setOriginForNaryOp(I);
}
+ // Convert `Mask` into `<n x i1>`.
+ Constant *createDppMask(unsigned Width, unsigned Mask) {
+ SmallVector<Constant *, 4> R;
+ R.assign(Width, ConstantInt::getFalse(F.getContext()));
+ for (auto &M : R) {
+ if (Mask & 1)
+ M = ConstantInt::getTrue(F.getContext());
+ Mask >>= 1;
+ }
+ return ConstantVector::get(R);
+ }
+
+ // Calculate output shadow as array of booleans `<n x i1>`, assuming if any
----------------
fmayer wrote:
Ah, ok. Please add a comment. I guess these instructions are beyond the reach
of the C++ standard, so there is no proper definition for "undefined bits" that
would say whether multiplying one by zero is UB or not?
https://github.com/llvm/llvm-project/pull/94875
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