================
@@ -177,16 +177,16 @@ define void @add_unique_ind32(ptr noalias nocapture %a,
i64 %n) {
; CHECK-LABEL: @add_unique_ind32(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
-; CHECK-NEXT: [[TMP1:%.*]] = shl i64 [[TMP0]], 2
+; CHECK-NEXT: [[TMP1:%.*]] = shl nuw i64 [[TMP0]], 2
----------------
fhahn wrote:
I guess the code here already implicitly assumes that the multiply does not
overflow, but it is not immedately clear how this follows from the definition
of `llvm.vscale` in LangRef, which says only limits `vscale` to a positive
constant:
```
vscale is a positive value that is constant throughout program execution, but
is unknown at compile time. If the result value does not fit in the result
type, then the result is a [poison
value](https://llvm.org/docs/LangRef.html#poisonvalues).
```
https://github.com/llvm/llvm-project/pull/143532
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