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

[Allen zhong via Phabricator via llvm-commits]

Allen marked 3 inline comments as done.
Allen added inline comments.


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Comment at: llvm/test/CodeGen/AArch64/i128-cmp.ll:21-22
+; CHECK-NEXT:    cmp x0, x2
+; CHECK-NEXT:    ccmp x1, x3, #0, eq
+; CHECK-NEXT:    cset w0, eq
 ; CHECK-NEXT:    ret
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dmgreen wrote:
> And here it needs to set based on ne, so maybe `ccmp #8, eq; cmp ne`.
> 
> Those two verify as equivalent.
can also find the cases in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104611


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https://reviews.llvm.org/D136244