[llvm] [X86] Handle BSF/BSF "zero-input pass through" behaviour (PR #123623)

[via llvm-commits]

github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff 5139c90dfcacfba3d6ddc16ccb377a086abac7aa f1baef44b9eb4fcaa7ac36585a5160b800317748 --extensions h,cpp -- llvm/lib/Target/X86/X86ISelLowering.cpp llvm/lib/Target/X86/X86Subtarget.h
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 1a1782160f..4e6a8ffe10 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -434,7 +434,7 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
 
   if (!Subtarget.hasBMI()) {
     setOperationAction(ISD::CTTZ           , MVT::i32  , Custom);
-    setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32  , Custom);
+    setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Custom);
     if (Subtarget.is64Bit()) {
       setOperationPromotedToType(ISD::CTTZ , MVT::i32, MVT::i64);
       setOperationAction(ISD::CTTZ         , MVT::i64  , Custom);

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https://github.com/llvm/llvm-project/pull/123623