[llvm] [SPIR-V] Add support for HLSL SV_GroupIndex (PR #130670)

[Steven Perron via llvm-commits]

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@@ -4005,6 +4017,38 @@ bool SPIRVInstructionSelector::loadVec3BuiltinInputID(
   return Result && MIB.constrainAllUses(TII, TRI, RBI);
 }
 
+// Generate the instructions to load 32-bit integer builtin input IDs/Indices.
+// Like LocalInvocationIndex
+bool SPIRVInstructionSelector::loadBuiltinInputID(
+    SPIRV::BuiltIn::BuiltIn BuiltInValue, Register ResVReg,
+    const SPIRVType *ResType, MachineInstr &I) const {
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s-perron wrote:

Why do you pass in `ResType` if you will not use it?

https://github.com/llvm/llvm-project/pull/130670