[llvm] [LoongArch][GlobalISel] Adding initial GlobalISel infrastructure (PR #76912)

[via llvm-commits]

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@@ -0,0 +1,53 @@
+//===-- LoongArchCallLowering.cpp - Call lowering -------------------*- C++
+//-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file
+/// This file implements the lowering of LLVM calls to machine code calls for
+/// GlobalISel.
+//
+//===----------------------------------------------------------------------===//
+
+#include "LoongArchCallLowering.h"
+#include "LoongArchISelLowering.h"
+#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
+
+using namespace llvm;
+
+LoongArchCallLowering::LoongArchCallLowering(const LoongArchTargetLowering &TLI)
+    : CallLowering(&TLI) {}
+
+bool LoongArchCallLowering::lowerReturn(MachineIRBuilder &MIRBuilder,
+                                        const Value *Val,
+                                        ArrayRef<Register> VRegs,
+                                        FunctionLoweringInfo &FLI,
+                                        Register SwiftErrorVReg) const {
+
+  MachineInstrBuilder Ret = MIRBuilder.buildInstrNoInsert(LoongArch::PseudoRET);
+
+  if (Val != nullptr) {
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GongMengyao wrote:

It has been modified, thanks.

https://github.com/llvm/llvm-project/pull/76912