[llvm] [AArch64] Improve fixed vector lowering for cttz/ctlz when sve (PR #192427)

via llvm-commits llvm-commits at lists.llvm.org
Thu Apr 16 03:46:09 PDT 2026


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/AArch64/AArch64ISelLowering.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index a45ff186a..9084af1ba 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -1935,10 +1935,10 @@ AArch64TargetLowering::AArch64TargetLowering(const TargetMachine &TM,
       setOperationAction(ISD::VECREDUCE_UMIN, MVT::v2i64, Custom);
     }
 
-    for (auto VT : {MVT::v8i8, MVT::v16i8, MVT::v4i16, MVT::v8i16,
-      MVT::v2i32, MVT::v4i32, MVT::v1i64, MVT::v2i64}) {
-        setOperationAction(ISD::CTLZ, VT, Custom);
-        setOperationAction(ISD::CTTZ, VT, Custom);
+    for (auto VT : {MVT::v8i8, MVT::v16i8, MVT::v4i16, MVT::v8i16, MVT::v2i32,
+                    MVT::v4i32, MVT::v1i64, MVT::v2i64}) {
+      setOperationAction(ISD::CTLZ, VT, Custom);
+      setOperationAction(ISD::CTTZ, VT, Custom);
     }
 
     // NOTE: Currently this has to happen after computeRegisterProperties rather

``````````

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https://github.com/llvm/llvm-project/pull/192427


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