[llvm] fix comment typo in ExpandFCOPYSIGN (PR #111489)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-selectiondag

Author: Ralf Jung (RalfJung)

<details>
<summary>Changes</summary>

I noticed this while following https://github.com/llvm/llvm-project/pull/111269. It makes little sense that FCOPYSIGN would look at the sign of `x`, right? Surely this must be `y`. Also fix the inconsistency where it's sometimes `x` and sometimes `X`.

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Full diff: https://github.com/llvm/llvm-project/pull/111489.diff


1 Files Affected:

- (modified) llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp (+1-1) 


``````````diff
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 42d031310d5e02..5d324f50cce457 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -1657,7 +1657,7 @@ SDValue SelectionDAGLegalize::ExpandFCOPYSIGN(SDNode *Node) const {
   SDValue SignBit = DAG.getNode(ISD::AND, DL, IntVT, SignAsInt.IntValue,
                                 SignMask);
 
-  // If FABS is legal transform FCOPYSIGN(x, y) => sign(x) ? -FABS(x) : FABS(X)
+  // If FABS is legal transform FCOPYSIGN(x, y) => SignBit(y) ? -FABS(x) : FABS(x)
   EVT FloatVT = Mag.getValueType();
   if (TLI.isOperationLegalOrCustom(ISD::FABS, FloatVT) &&
       TLI.isOperationLegalOrCustom(ISD::FNEG, FloatVT)) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/111489