1 files changed, 46 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/X86/X86CallLowering.cpp b/contrib/llvm/lib/Target/X86/X86CallLowering.cpp
new file mode 100644
index 0000000..5ae4962
--- /dev/null
+++ b/contrib/llvm/lib/Target/X86/X86CallLowering.cpp
@@ -0,0 +1,46 @@
+//===-- llvm/lib/Target/X86/X86CallLowering.cpp - Call lowering -----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file implements the lowering of LLVM calls to machine code calls for
+/// GlobalISel.
+///
+//===----------------------------------------------------------------------===//
+
+#include "X86CallLowering.h"
+#include "X86ISelLowering.h"
+#include "X86InstrInfo.h"
+#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
+
+using namespace llvm;
+
+#ifndef LLVM_BUILD_GLOBAL_ISEL
+#error "This shouldn't be built without GISel"
+#endif
+
+X86CallLowering::X86CallLowering(const X86TargetLowering &TLI)
+    : CallLowering(&TLI) {}
+
+bool X86CallLowering::lowerReturn(MachineIRBuilder &MIRBuilder,
+                                  const Value *Val, unsigned VReg) const {
+  // TODO: handle functions returning non-void values.
+  if (Val)
+    return false;
+
+  MIRBuilder.buildInstr(X86::RET).addImm(0);
+
+  return true;
+}
+
+bool X86CallLowering::lowerFormalArguments(MachineIRBuilder &MIRBuilder,
+                                           const Function &F,
+                                           ArrayRef<unsigned> VRegs) const {
+  // TODO: handle functions with one or more arguments.
+  return F.arg_empty();
+}