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[InstCombine] Crash on valid input when narrowing type but not updating range attribute #112633

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goldsteinn opened this issue Oct 16, 2024 · 1 comment · May be fixed by #112649
Open

[InstCombine] Crash on valid input when narrowing type but not updating range attribute #112633

goldsteinn opened this issue Oct 16, 2024 · 1 comment · May be fixed by #112649
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crash-on-valid llvm:instcombine

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@goldsteinn
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https://godbolt.org/z/b3M1dj6aj

define void @SetRow_C(ptr %p, i32 %conv) {
entry:
  %call.i = tail call ptr @__memset_chk(ptr %p, i32 range(i32 0, 123) %conv, i64 1, i64 1)
  ret void
}

declare ptr @__memset_chk(ptr, i32, i64, i64)

We keep the range(i32 ...) when we replace the _chk with memset.inline.p0.i64 which leads to a crash:

Range bit width must match type bit width!
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 1 dereferenceable(1) %p, i8 range(i32 0, 250) %0, i64 1, i1 false)
@goldsteinn goldsteinn self-assigned this Oct 16, 2024
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Ill have fix up in a bit. Going to basically add AttributeSet to typeIncompatible and drop range if it has become invalid.

@goldsteinn goldsteinn linked a pull request Oct 17, 2024 that will close this issue
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goldsteinn added a commit to goldsteinn/llvm-project that referenced this issue Oct 17, 2024
@goldsteinn
[SimplifyLibCall][Attribute] Fix bug where we may keep range attr w…
d105ec7 
…ith incompatible type

In a variety of places we change the bitwidth of a parameter but don't
update the attributes.

The issue in this case is from the `range` attribute when inlining
`__memset_chk`. `optimizeMemSetChk` will replace an `i32` with an
`i8`, and if the `i32` had a `range` attr assosiated it will cause an
error.

Fixes llvm#112633
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