[llvm] [GlobalIsel] Transform build_vector(binop(_, C), ...) -> binop(bv, constant bv) (PR #73577)

[Thorsten Schütt via llvm-commits]

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@@ -6224,3 +6224,89 @@ void CombinerHelper::applyCommuteBinOpOperands(MachineInstr &MI) {
   MI.getOperand(2).setReg(LHSReg);
   Observer.changedInstr(MI);
 }
+
+// Transform build_vector of binop(_,C) -> binop(BV, constant BV).
+bool CombinerHelper::matchBuildVectorToBinOp(MachineInstr &MI,
+                                             BuildFnTy &MatchInfo) {
+  GBuildVector *BuildVector = cast<GBuildVector>(&MI);
+  Register Dst = BuildVector->getReg(0);
+
+  unsigned NumOfSources = BuildVector->getNumSources();
+  if (NumOfSources == 1)
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tschuett wrote:

It was probably a profitability check. Removed.

https://github.com/llvm/llvm-project/pull/73577