GlobalISel: rework CallLowering so that it can be used for libcalls too.
There should be no functional change here, I'm just making the implementation
of "frem" (to libcall) legalization easier for a followup.
llvm-svn: 279987
diff --git a/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp b/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
new file mode 100644
index 0000000..9d1c1e7
--- /dev/null
+++ b/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
@@ -0,0 +1,40 @@
+//===-- lib/CodeGen/GlobalISel/CallLowering.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 some simple delegations needed for call lowering.
+///
+//===----------------------------------------------------------------------===//
+
+
+#include "llvm/CodeGen/GlobalISel/CallLowering.h"
+#include "llvm/CodeGen/MachineOperand.h"
+#include "llvm/IR/Instructions.h"
+
+using namespace llvm;
+
+bool CallLowering::lowerCall(
+ MachineIRBuilder &MIRBuilder, const CallInst &CI, unsigned ResReg,
+ ArrayRef<unsigned> ArgRegs, std::function<unsigned()> GetCalleeReg) const {
+ // First step is to marshall all the function's parameters into the correct
+ // physregs and memory locations. Gather the sequence of argument types that
+ // we'll pass to the assigner function.
+ SmallVector<MVT, 8> ArgTys;
+ for (auto &Arg : CI.arg_operands())
+ ArgTys.push_back(MVT::getVT(Arg->getType()));
+
+ MachineOperand Callee = MachineOperand::CreateImm(0);
+ if (Function *F = CI.getCalledFunction())
+ Callee = MachineOperand::CreateGA(F, 0);
+ else
+ Callee = MachineOperand::CreateReg(GetCalleeReg(), false);
+
+ return lowerCall(MIRBuilder, Callee, MVT::getVT(CI.getType()),
+ ResReg ? ResReg : ArrayRef<unsigned>(), ArgTys, ArgRegs);
+}