[clang] [llvm] [HLSL] Implement `WaveReadLaneAt` intrinsic (PR #111010)
Farzon Lotfi via cfe-commits
cfe-commits at lists.llvm.org
Fri Oct 4 14:07:45 PDT 2024
================
@@ -18835,6 +18835,22 @@ case Builtin::BI__builtin_hlsl_elementwise_isinf: {
Intrinsic::ID ID = CGM.getHLSLRuntime().getWaveIsFirstLaneIntrinsic();
return EmitRuntimeCall(Intrinsic::getDeclaration(&CGM.getModule(), ID));
}
+ case Builtin::BI__builtin_hlsl_wave_read_lane_at: {
+ // Due to the use of variadic arguments we must explicitly retreive them and
+ // create our function type.
+ Value *OpExpr = EmitScalarExpr(E->getArg(0));
+ Value *OpIndex = EmitScalarExpr(E->getArg(1));
+ llvm::FunctionType *FT = llvm::FunctionType::get(
+ OpExpr->getType(), ArrayRef{OpExpr->getType(), OpIndex->getType()},
+ false);
+
+ // Get overloaded name
+ std::string name =
+ Intrinsic::getName(CGM.getHLSLRuntime().getWaveReadLaneAtIntrinsic(),
+ ArrayRef{OpExpr->getType()}, &CGM.getModule());
+ return EmitRuntimeCall(CGM.CreateRuntimeFunction(FT, name, {}, false, true),
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farzonl wrote:
put the arg name for false and true via a comment something like `/*BlahType=*/false, /*BlahType2=*/true)` but instead of Blah use the arg name in `CreateRuntimeFunction`
https://github.com/llvm/llvm-project/pull/111010
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