[llvm] [LegalizeDAG] Optimize CodeGen for `ISD::CTLZ_ZERO_UNDEF` (PR #83039)

[Manish Kausik H via llvm-commits]

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@@ -1517,13 +1510,11 @@ define i32 @cttz_i32_osize(i32 %x) optsize {
 define i32 @cttz_i32_msize(i32 %x) minsize {
 ; X86-LABEL: cttz_i32_msize:
 ; X86:       # %bb.0:
-; X86-NOT:     rep
 ; X86-NEXT:    bsfl {{[0-9]+}}(%esp), %eax
 ; X86-NEXT:    retl
 ;
 ; X64-LABEL: cttz_i32_msize:
 ; X64:       # %bb.0:
-; X64-NOT:     rep
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Nirhar wrote:

Done!

https://github.com/llvm/llvm-project/pull/83039