[llvm] [SPIR-V] Add SPV_INTEL_predicated_io extension (PR #161591)

[Dmitry Sidorov via llvm-commits]

================
@@ -2419,6 +2419,29 @@ static bool generatePipeInst(const SPIRV::IncomingCall *Call,
   return buildPipeInst(Call, Opcode, Scope, MIRBuilder, GR);
 }
 
+static bool generatePredicatedLoadStoreInst(const SPIRV::IncomingCall *Call,
+                                            MachineIRBuilder &MIRBuilder,
+                                            SPIRVGlobalRegistry *GR) {
+  const SPIRV::DemangledBuiltin *Builtin = Call->Builtin;
+  unsigned Opcode =
+      SPIRV::lookupNativeBuiltin(Builtin->Name, Builtin->Set)->Opcode;
+
+  bool IsSet = Opcode != SPIRV::OpPredicatedStoreINTEL;
+  unsigned ArgSz = Call->Arguments.size();
+  unsigned LiteralIdx = 0;
+  if (ArgSz > 3) {
+    LiteralIdx = 3;
+  }
+
+  SmallVector<uint32_t, 1> ImmArgs;
+  MachineRegisterInfo *MRI = MIRBuilder.getMRI();
+  if (LiteralIdx > 0)
+    ImmArgs.push_back(getConstFromIntrinsic(Call->Arguments[LiteralIdx], MRI));
----------------
MrSidims wrote:

```suggestion
  SmallVector<uint32_t, 1> ImmArgs;
  MachineRegisterInfo *MRI = MIRBuilder.getMRI();
  if (ArgSz > 3)
    ImmArgs.push_back(getConstFromIntrinsic(Call->Arguments[/*Literal index*/ 3], MRI));

```

https://github.com/llvm/llvm-project/pull/161591