[llvm] [SelectionDAG] Lowering usub.sat(a, 1) to a - (a != 0) (PR #170076)

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Sun Nov 30 21:24:54 PST 2025


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git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index b3af59b65..acf6bd3e0 100644
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -10870,8 +10870,7 @@ SDValue TargetLowering::expandAddSubSat(SDNode *Node, SelectionDAG &DAG) const {
   // usub.sat(a, 1) -> a - zext(a != 0)
   if (Opcode == ISD::USUBSAT && !VT.isVector() && isOneConstant(RHS)) {
     SDValue Zero = DAG.getConstant(0, dl, VT);
-    EVT BoolVT =
-        getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), VT);
+    EVT BoolVT = getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), VT);
     SDValue IsNonZero = DAG.getSetCC(dl, BoolVT, LHS, Zero, ISD::SETNE);
     SDValue Subtrahend = DAG.getBoolExtOrTrunc(IsNonZero, dl, VT, BoolVT);
     return DAG.getNode(ISD::SUB, dl, VT, LHS, Subtrahend);

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https://github.com/llvm/llvm-project/pull/170076


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