[PATCH] D48508: [DAGCombiner] eliminate setcc bool math when input is low-bit of some value

[Sanjay Patel via Phabricator via llvm-commits]

spatel added inline comments.


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Comment at: test/CodeGen/X86/bool-math.ll:159
+; CHECK-NEXT:    movb $41, %al
+; CHECK-NEXT:    subb %dil, %al
 ; CHECK-NEXT:    retq
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craig.topper wrote:
> I wonder if we can turn the subb here into xor to allow the constant to fold?
Yes, there's probably a demanded / common bits check missing.


https://reviews.llvm.org/D48508