[LLVM][ComplexDeinterleaving] Update splat identification to include vector ConstantInt/FP. (#144516)

Author: paulwalker-arm

llvm/lib/CodeGen/ComplexDeinterleavingPass.cpp

@@ -2005,6 +2005,9 @@ ComplexDeinterleavingGraph::identifySplat(Value *R, Value *I) {
     if (isa<ConstantDataVector>(V))
       return true;
 
+    if (isa<ConstantInt>(V) || isa<ConstantFP>(V))
+      return isa<VectorType>(V->getType());
+
     VectorType *VTy;
     ArrayRef<int> Mask;
     // Splats are represented differently depending on whether the repeated

llvm/test/CodeGen/AArch64/complex-deinterleaving-splat-scalable.ll

@@ -1,5 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc < %s --mattr=+sve -o - | FileCheck %s
+; RUN: llc -use-constant-int-for-scalable-splat -use-constant-fp-for-scalable-splat < %s --mattr=+sve -o - | FileCheck %s
 
 target triple = "aarch64"