[clang] [llvm] Adding splitdouble HLSL function (PR #109331)

[via llvm-commits]

================
@@ -18952,6 +18955,142 @@ case Builtin::BI__builtin_hlsl_elementwise_isinf: {
         CGM.getHLSLRuntime().getRadiansIntrinsic(), ArrayRef<Value *>{Op0},
         nullptr, "hlsl.radians");
   }
+  case Builtin::BI__builtin_hlsl_splitdouble: {
+
+    assert((E->getArg(0)->getType()->hasFloatingRepresentation() &&
+            E->getArg(1)->getType()->hasUnsignedIntegerRepresentation() &&
+            E->getArg(2)->getType()->hasUnsignedIntegerRepresentation()) &&
+           "asuint operands types mismatch");
+    Value *Op0 = EmitScalarExpr(E->getArg(0));
+    const auto *OutArg1 = dyn_cast<HLSLOutArgExpr>(E->getArg(1));
+    const auto *OutArg2 = dyn_cast<HLSLOutArgExpr>(E->getArg(2));
+
+    CallArgList Args;
+    LValue Op1TmpLValue = EmitHLSLOutArgExpr(OutArg1, Args, OutArg1->getType());
+    LValue Op2TmpLValue = EmitHLSLOutArgExpr(OutArg2, Args, OutArg2->getType());
+
+    if (getTarget().getCXXABI().areArgsDestroyedLeftToRightInCallee())
+      Args.reverseWritebacks();
+
+    auto EmitVectorCode =
+        [](Value *Op, CGBuilderTy *Builder,
+           FixedVectorType *DestTy) -> std::pair<Value *, Value *> {
+      Value *bitcast = Builder->CreateBitCast(Op, DestTy);
+
+      SmallVector<int> LowbitsIndex;
+      SmallVector<int> HighbitsIndex;
+
+      for (unsigned int Idx = 0; Idx < DestTy->getNumElements(); Idx += 2) {
+        LowbitsIndex.push_back(Idx);
+        HighbitsIndex.push_back(Idx + 1);
+      }
+
+      Value *Arg0 = Builder->CreateShuffleVector(bitcast, LowbitsIndex);
+      Value *Arg1 = Builder->CreateShuffleVector(bitcast, HighbitsIndex);
+
+      return std::make_pair(Arg0, Arg1);
+    };
+
+    Value *LastInst = nullptr;
+
+    if (CGM.getTarget().getTriple().isDXIL()) {
+
+      llvm::Type *RetElementTy = Int32Ty;
+      if (auto *Op0VecTy = E->getArg(0)->getType()->getAs<VectorType>())
+        RetElementTy = llvm::VectorType::get(
+            Int32Ty, ElementCount::getFixed(Op0VecTy->getNumElements()));
+      auto *RetTy = llvm::StructType::get(RetElementTy, RetElementTy);
+
+      CallInst *CI = Builder.CreateIntrinsic(
+          RetTy, Intrinsic::dx_splitdouble, {Op0}, nullptr, "hlsl.splitdouble");
+
+      Value *Arg0 = Builder.CreateExtractValue(CI, 0);
+      Value *Arg1 = Builder.CreateExtractValue(CI, 1);
+
+      Builder.CreateStore(Arg0, Op1TmpLValue.getAddress());
+      LastInst = Builder.CreateStore(Arg1, Op2TmpLValue.getAddress());
+
+    } else {
+
+      assert(!CGM.getTarget().getTriple().isDXIL() &&
+             "For non-DXIL targets we generate the instructions");
----------------
joaosaffran wrote:

This assert came as a suggestion in https://github.com/llvm/llvm-project/pull/109331#discussion_r1792006593 for this PR. The intention is to alert other developers about the behaviour for clang when compiling non DXIL targets. Let me know if you have a better approach for this.

https://github.com/llvm/llvm-project/pull/109331