[llvm-commits] [llvm] r70702 - in /llvm/trunk/lib/Target/MSP430: MSP430.td MSP430CallingConv.td MSP430ISelLowering.cpp MSP430ISelLowering.h
Anton Korobeynikov
asl at math.spbu.ru
Sun May 3 05:59:33 PDT 2009
Author: asl
Date: Sun May 3 07:59:33 2009
New Revision: 70702
URL: http://llvm.org/viewvc/llvm-project?rev=70702&view=rev
Log:
Add first draft of MSP430 calling convention stuff and draft of ISD::FORMAL_ARGUMENTS node lowering.
Added:
llvm/trunk/lib/Target/MSP430/MSP430CallingConv.td
Modified:
llvm/trunk/lib/Target/MSP430/MSP430.td
llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.cpp
llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.h
Modified: llvm/trunk/lib/Target/MSP430/MSP430.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/MSP430/MSP430.td?rev=70702&r1=70701&r2=70702&view=diff
==============================================================================
--- llvm/trunk/lib/Target/MSP430/MSP430.td (original)
+++ llvm/trunk/lib/Target/MSP430/MSP430.td Sun May 3 07:59:33 2009
@@ -37,6 +37,12 @@
include "MSP430RegisterInfo.td"
//===----------------------------------------------------------------------===//
+// Calling Convention Description
+//===----------------------------------------------------------------------===//
+
+include "MSP430CallingConv.td"
+
+//===----------------------------------------------------------------------===//
// Instruction Descriptions
//===----------------------------------------------------------------------===//
Added: llvm/trunk/lib/Target/MSP430/MSP430CallingConv.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/MSP430/MSP430CallingConv.td?rev=70702&view=auto
==============================================================================
--- llvm/trunk/lib/Target/MSP430/MSP430CallingConv.td (added)
+++ llvm/trunk/lib/Target/MSP430/MSP430CallingConv.td Sun May 3 07:59:33 2009
@@ -0,0 +1,34 @@
+//==- MSP430CallingConv.td - Calling Conventions for MSP430 -*- tablegen -*-==//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// This describes the calling conventions for MSP430 architecture.
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// MSP430 Return Value Calling Convention
+//===----------------------------------------------------------------------===//
+def RetCC_MSP430 : CallingConv<[
+ // i16 are returned in registers R15, R14, R13, R12
+ CCIfType<[i16], CCAssignToReg<[R15, R14, R13, R12]>>
+]>;
+
+//===----------------------------------------------------------------------===//
+// MSP430 Argument Calling Conventions
+//===----------------------------------------------------------------------===//
+def CC_MSP430 : CallingConv<[
+ // Promote i8 arguments to i16.
+ CCIfType<[i8], CCPromoteToType<i16>>,
+
+ // The first 4 integer arguments of non-varargs functions are passed in
+ // integer registers.
+ CCIfNotVarArg<CCIfType<[i16], CCAssignToReg<[R15, R14, R13, R12]>>>,
+
+ // Integer values get stored in stack slots that are 2 bytes in
+ // size and 2-byte aligned.
+ CCIfType<[i16], CCAssignToStack<2, 2>>
+]>;
Modified: llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.cpp?rev=70702&r1=70701&r2=70702&view=diff
==============================================================================
--- llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.cpp Sun May 3 07:59:33 2009
@@ -28,6 +28,7 @@
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/Support/Debug.h"
@@ -47,10 +48,109 @@
SDValue MSP430TargetLowering::
LowerOperation(SDValue Op, SelectionDAG &DAG) {
switch (Op.getOpcode()) {
+ case ISD::FORMAL_ARGUMENTS: return LowerFORMAL_ARGUMENTS(Op, DAG);
default:
assert(0 && "unimplemented operand");
return SDValue();
}
}
+//===----------------------------------------------------------------------===//
+// Calling Convention Implementation
+//===----------------------------------------------------------------------===//
+
#include "MSP430GenCallingConv.inc"
+
+SDValue MSP430TargetLowering::LowerFORMAL_ARGUMENTS(SDValue Op,
+ SelectionDAG &DAG) {
+ unsigned CC = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
+ switch (CC) {
+ default:
+ assert(0 && "Unsupported calling convention");
+ case CallingConv::C:
+ case CallingConv::Fast:
+ return LowerCCCArguments(Op, DAG);
+ }
+}
+
+/// LowerCCCArguments - transform physical registers into virtual registers and
+/// generate load operations for arguments places on the stack.
+// FIXME: struct return stuff
+// FIXME: varargs
+SDValue MSP430TargetLowering:: LowerCCCArguments(SDValue Op,
+ SelectionDAG &DAG) {
+ MachineFunction &MF = DAG.getMachineFunction();
+ MachineFrameInfo *MFI = MF.getFrameInfo();
+ MachineRegisterInfo &RegInfo = MF.getRegInfo();
+ SDValue Root = Op.getOperand(0);
+ bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0;
+ unsigned CC = MF.getFunction()->getCallingConv();
+ DebugLoc dl = Op.getDebugLoc();
+
+ // Assign locations to all of the incoming arguments.
+ SmallVector<CCValAssign, 16> ArgLocs;
+ CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs);
+ CCInfo.AnalyzeFormalArguments(Op.getNode(), CC_MSP430);
+
+ assert(!isVarArg && "Varargs not supported yet");
+
+ SmallVector<SDValue, 16> ArgValues;
+ for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
+ CCValAssign &VA = ArgLocs[i];
+ if (VA.isRegLoc()) {
+ // Arguments passed in registers
+ MVT RegVT = VA.getLocVT();
+ switch (RegVT.getSimpleVT()) {
+ default:
+ cerr << "LowerFORMAL_ARGUMENTS Unhandled argument type: "
+ << RegVT.getSimpleVT()
+ << "\n";
+ abort();
+ case MVT::i16:
+ unsigned VReg =
+ RegInfo.createVirtualRegister(MSP430::MSP430RegsRegisterClass);
+ RegInfo.addLiveIn(VA.getLocReg(), VReg);
+ SDValue ArgValue = DAG.getCopyFromReg(Root, dl, VReg, RegVT);
+
+ // If this is an 8-bit value, it is really passed promoted to 16
+ // bits. Insert an assert[sz]ext to capture this, then truncate to the
+ // right size.
+ if (VA.getLocInfo() == CCValAssign::SExt)
+ ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
+ DAG.getValueType(VA.getValVT()));
+ else if (VA.getLocInfo() == CCValAssign::ZExt)
+ ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
+ DAG.getValueType(VA.getValVT()));
+
+ if (VA.getLocInfo() != CCValAssign::Full)
+ ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
+
+ ArgValues.push_back(ArgValue);
+ }
+ } else {
+ // Sanity check
+ assert(VA.isMemLoc());
+ // Load the argument to a virtual register
+ unsigned ObjSize = VA.getLocVT().getSizeInBits()/8;
+ if (ObjSize > 2) {
+ cerr << "LowerFORMAL_ARGUMENTS Unhandled argument type: "
+ << VA.getLocVT().getSimpleVT()
+ << "\n";
+ }
+ // Create the frame index object for this incoming parameter...
+ int FI = MFI->CreateFixedObject(ObjSize, VA.getLocMemOffset());
+
+ // Create the SelectionDAG nodes corresponding to a load
+ //from this parameter
+ SDValue FIN = DAG.getFrameIndex(FI, MVT::i16);
+ ArgValues.push_back(DAG.getLoad(VA.getLocVT(), dl, Root, FIN,
+ PseudoSourceValue::getFixedStack(FI), 0));
+ }
+ }
+
+ ArgValues.push_back(Root);
+
+ // Return the new list of results.
+ return DAG.getNode(ISD::MERGE_VALUES, dl, Op.getNode()->getVTList(),
+ &ArgValues[0], ArgValues.size()).getValue(Op.getResNo());
+}
Modified: llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.h?rev=70702&r1=70701&r2=70702&view=diff
==============================================================================
--- llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.h (original)
+++ llvm/trunk/lib/Target/MSP430/MSP430ISelLowering.h Sun May 3 07:59:33 2009
@@ -30,6 +30,8 @@
/// LowerOperation - Provide custom lowering hooks for some operations.
virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
+ SDValue LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG);
+ SDValue LowerCCCArguments(SDValue Op, SelectionDAG &DAG);
private:
const MSP430Subtarget &Subtarget;
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