[PATCH] D97160: [DAGCombiner] Optimize SMULO/UMULO if we can prove that overflow is impossible.

[Craig Topper via Phabricator via llvm-commits]

craig.topper added inline comments.


================
Comment at: llvm/test/CodeGen/X86/xmulo.ll:11
+; CHECK-NEXT:    xorl %edx, %edx
 ; CHECK-NEXT:    retq
   %1 = call {i64, i1} @llvm.umul.with.overflow.i64(i64 9, i64 8)
----------------
RKSimon wrote:
> Are we missing constant folding?
Looks like it. Doesn't look like we have it for ADDO either.


Repository:
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  https://reviews.llvm.org/D97160/new/

https://reviews.llvm.org/D97160