[clang] [llvm] [HLSL] Implement WaveActiveAnyTrue intrinsic (PR #115902)

[Farzon Lotfi via cfe-commits]

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@@ -1949,24 +1955,48 @@ bool SPIRVInstructionSelector::selectSign(Register ResVReg,
   return Result;
 }
 
+bool SPIRVInstructionSelector::selectWaveNOpInst(Register ResVReg,
+                                                 const SPIRVType *ResType,
+                                                 MachineInstr &I,
+                                                 unsigned Opcode,
+                                                 unsigned OperandCount) const {
+  assert(I.getNumOperands() == OperandCount);
+  for (unsigned j = 2; j < OperandCount; j++) {
+    assert(I.getOperand(j).isReg());
+  }
+
+  MachineBasicBlock &BB = *I.getParent();
+  SPIRVType *IntTy = GR.getOrCreateSPIRVIntegerType(32, I, TII);
+
+  auto BMI = BuildMI(BB, I, I.getDebugLoc(), TII.get(Opcode))
+                 .addDef(ResVReg)
+                 .addUse(GR.getSPIRVTypeID(ResType))
+                 .addUse(GR.getOrCreateConstInt(SPIRV::Scope::Subgroup, I,
+                                                IntTy, TII));
+
+  for (unsigned j = 2; j < OperandCount; j++) {
+    BMI.addUse(I.getOperand(j).getReg());
+  }
+
+  return BMI.constrainAllUses(TII, TRI, RBI);
+}
+
+bool SPIRVInstructionSelector::selectWaveActiveAnyTrue(Register ResVReg,
+                                                       const SPIRVType *ResType,
+                                                       MachineInstr &I) const {
+  return selectWaveNOpInst(ResVReg, ResType, I, SPIRV::OpGroupNonUniformAny, 3);
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farzonl wrote:

Typically when we do constants like 3 we put a comment in the form 

`/*arg_name=*/3`

https://github.com/llvm/llvm-project/pull/115902