[llvm] Add PreLegalizer pattern matching for degrees GL extension (PR #216506)

[via llvm-commits]

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@@ -381,3 +381,53 @@ void SPIRVCombinerHelper::applyMatrixMultiply(MachineInstr &MI) const {
     Builder.buildBuildVector(ResReg, ResultScalars);
   MI.eraseFromParent();
 }
+
+bool SPIRVCombinerHelper::matchDegrees(MachineInstr &MI) const {
+  if (MI.getOpcode() != TargetOpcode::G_FMUL)
+    return false;
+  Register Op1 = MI.getOperand(1).getReg();
+  Register Op2 = MI.getOperand(2).getReg();
+  MachineInstr *Op1Def = MRI.getVRegDef(Op1);
+  MachineInstr *Op2Def = MRI.getVRegDef(Op2);
+
+  if (!Op1Def || !Op2Def)
+    return false;
+
+  if (Op1Def->getOpcode() != TargetOpcode::G_FCONSTANT &&
+      Op2Def->getOpcode() != TargetOpcode::G_FCONSTANT)
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albertbolt1 wrote:

added

https://github.com/llvm/llvm-project/pull/216506