[llvm] [X86] Fold chained i32 CLMUL operands (PR #202250)

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Mon Jun 8 23:11:23 PDT 2026


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/X86/X86ISelLowering.cpp --diff_from_common_commit
``````````

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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 9d20f0713..ca841ff9a 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -45477,11 +45477,11 @@ bool X86TargetLowering::SimplifyDemandedBitsForTargetNode(
     APInt LoElts = APInt::getSplat(NumElts, APInt(2, 0b01));
     APInt SrcBits = APInt::getLowBitsSet(BitWidth, DemandedLoBits);
     KnownBits KnownLHS, KnownRHS;
-    if (SimplifyDemandedBits(Op.getOperand(0), SrcBits,
-                             M0 ? HighElts : LoElts, KnownLHS, TLO, Depth + 1))
+    if (SimplifyDemandedBits(Op.getOperand(0), SrcBits, M0 ? HighElts : LoElts,
+                             KnownLHS, TLO, Depth + 1))
       return true;
-    if (SimplifyDemandedBits(Op.getOperand(1), SrcBits,
-                             M1 ? HighElts : LoElts, KnownRHS, TLO, Depth + 1))
+    if (SimplifyDemandedBits(Op.getOperand(1), SrcBits, M1 ? HighElts : LoElts,
+                             KnownRHS, TLO, Depth + 1))
       return true;
 
     auto PeelToVector = [&](SDValue Operand, uint64_t M) -> SDValue {
@@ -45505,7 +45505,8 @@ bool X86TargetLowering::SimplifyDemandedBitsForTargetNode(
       MinScalarBits = std::min(MinScalarBits, Inner.getScalarValueSizeInBits());
 
       if (Inner.getOpcode() != ISD::EXTRACT_VECTOR_ELT ||
-          !isNullConstant(Inner.getOperand(1)) || DemandedLoBits > MinScalarBits)
+          !isNullConstant(Inner.getOperand(1)) ||
+          DemandedLoBits > MinScalarBits)
         return SDValue();
 
       SDValue Src = Inner.getOperand(0);

``````````

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https://github.com/llvm/llvm-project/pull/202250


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