[PATCH] D136244: [AArch64] Optimize memcmp when the result is tested for [in]equality with 0

Sat Oct 22 07:22:32 PDT 2022

Allen added inline comments.

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Comment at: llvm/test/CodeGen/AArch64/i128-cmp.ll:11
+; CHECK-NEXT:    ccmp x1, x3, #0, eq
+; CHECK-NEXT:    cset w0, ne
 ; CHECK-NEXT:    ret
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dmgreen wrote:
> Are you sure this is correct? It doesn't look right.
> 
> I think I would expect `ccmp #0, eq;  cset eq`.
Yes, I test the executive for the initial case in https://github.com/llvm/llvm-project/issues/58061

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  https://reviews.llvm.org/D136244/new/

https://reviews.llvm.org/D136244