================
@@ -1011,6 +1011,31 @@ static Value *foldPHINodeOrSelectInst(Instruction &I) {
return foldSelectInst(cast<SelectInst>(I));
}
+/// Returns a fixed vector type equivalent to the memory set by II or nullptr
if
+/// unable to do so.
+static FixedVectorType *getVectorTypeFor(const MemSetInst &II,
+ const DataLayout &DL) {
+ const ConstantInt *Length = dyn_cast<ConstantInt>(II.getLength());
+ if (!Length)
+ return nullptr;
+
+ APInt Val = Length->getValue();
+ if (Val.ugt(std::numeric_limits<unsigned>::max()))
+ return nullptr;
----------------
macurtis-amd wrote:
>Is this just because the maximum number of vector elts?
Yes.
> Although we probably shouldn't be trying to promote anything that's anything
> close to that big.
Is there a better limit that I should use instead?
I see other similar checks
[here](https://github.com/llvm/llvm-project/blob/f4d25c498a20d73b9d3e4828023486a7b2591f38/llvm/lib/Transforms/Scalar/SROA.cpp#L2219)
and
[here](https://github.com/llvm/llvm-project/blob/f4d25c498a20d73b9d3e4828023486a7b2591f38/llvm/lib/Transforms/Scalar/SROA.cpp#L3196).
https://github.com/llvm/llvm-project/pull/133301
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