[llvm] [LegalizeVectorOps] Enable ExpandFABS/COPYSIGN to use integer ops for fixed vectors in some cases. (PR #109232)

[Matt Arsenault via llvm-commits]

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@@ -1821,8 +1824,12 @@ SDValue VectorLegalizer::ExpandFABS(SDNode *Node) {
   EVT VT = Node->getValueType(0);
   EVT IntVT = VT.changeVectorElementTypeToInteger();
 
-  // FIXME: We shouldn't restrict this to scalable vectors.
-  if (!TLI.isOperationLegalOrCustom(ISD::AND, IntVT) || !VT.isScalableVector())
+  if (!TLI.isOperationLegalOrCustom(ISD::AND, IntVT))
+    return SDValue();
+
+  // FIXME: The FSUB check is here to force unrolling v1f64 vectors on AArch64.
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arsenm wrote:

can you really not just delete this now? There are no more fsubs emitted 

https://github.com/llvm/llvm-project/pull/109232