[llvm] [X86][GlobalISel] Enable SINCOS with libcall mapping (PR #142438)

[Matt Arsenault via llvm-commits]

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@@ -648,6 +650,57 @@ simpleLibcall(MachineInstr &MI, MachineIRBuilder &MIRBuilder, unsigned Size,
                        LocObserver, &MI);
 }
 
+LegalizerHelper::LegalizeResult LegalizerHelper::simpleLibcallSinCos(
+    MachineInstr &MI, MachineIRBuilder &MIRBuilder, unsigned Size, Type *OpType,
+    LostDebugLocObserver &LocObserver) {
+  MachineFunction &MF = *MI.getMF();
+  MachineRegisterInfo &MRI = MF.getRegInfo();
+
+  Register DstSin = MI.getOperand(0).getReg();
+  Register DstCos = MI.getOperand(1).getReg();
+  Register Src = MI.getOperand(2).getReg();
+  LLT DstTy = MRI.getType(DstSin);
+  LLT SrcTy = MRI.getType(Src);
+
+  assert((SrcTy.getSizeInBits() == 32 || SrcTy.getSizeInBits() == 64 ||
+          SrcTy.getSizeInBits() == 80) &&
+         "Unexpected source type for SINCOS.");
+
+  int MemSize = DstTy.getSizeInBytes();
+  Align Alignment = getStackTemporaryAlignment(DstTy);
+  const DataLayout &DL = MIRBuilder.getDataLayout();
+  unsigned AddrSpace = DL.getAllocaAddrSpace();
+  MachinePointerInfo PtrInfo;
+
+  Register StackPtrSin =
+      createStackTemporary(TypeSize::getFixed(MemSize), Alignment, PtrInfo)
+          .getReg(0);
+  Register StackPtrCos =
+      createStackTemporary(TypeSize::getFixed(MemSize), Alignment, PtrInfo)
+          .getReg(0);
+
+  auto &Ctx = MF.getFunction().getContext();
+  if (LegalizerHelper::LegalizeResult::Legalized !=
+      createLibcall(MIRBuilder, getRTLibDesc(MI.getOpcode(), Size),
+                    {{0}, Type::getVoidTy(Ctx), 0},
+                    {{Src, OpType, 0},
+                     {StackPtrSin, PointerType::get(Ctx, AddrSpace), 1},
+                     {StackPtrCos, PointerType::get(Ctx, AddrSpace), 2}},
+                    LocObserver, &MI)) {
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arsenm wrote:

Backwards condition. Also should pull the createLibcall and assign the status to a temporary variable 

https://github.com/llvm/llvm-project/pull/142438