[PATCH] D63318: [DAGCombine] Teach DAGCombine to fold the aext + select pattern

[Craig Topper via Phabricator via llvm-commits]

craig.topper added inline comments.


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Comment at: llvm/test/CodeGen/X86/cmov-promotion.ll:130
+; CMOV-NEXT:    movl $4294967295, %eax # imm = 0xFFFFFFFF
+; CMOV-NEXT:    cmovneq %rcx, %rax
 ; CMOV-NEXT:    retq
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This is slightly worse. Maybe don't do this when zext is free?


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  https://reviews.llvm.org/D63318/new/

https://reviews.llvm.org/D63318