[llvm] Add GFNI-based LZCNT lowering for vXi8 (PR #141888)
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Wed May 28 19:26:16 PDT 2025
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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->
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You can test this locally with the following command:
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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp -- llvm/lib/Target/X86/X86ISelLowering.cpp
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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 7918a8e72..6215b2533 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -29040,7 +29040,6 @@ static SDValue LowerCTLZ(SDValue Op, const X86Subtarget &Subtarget,
SDLoc dl(Op);
unsigned Opc = Op.getOpcode();
-
if (VT.isVector() && VT.getScalarType() == MVT::i8 && Subtarget.hasGFNI())
return LowerVectorCTLZ_GFNI(Op, DAG, Subtarget);
``````````
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https://github.com/llvm/llvm-project/pull/141888
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