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Added support for Mips O32 Calling Convention

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llvm-svn: 67280
This commit is contained in:
Bruno Cardoso Lopes 2009-03-19 02:12:28 +00:00
parent 37102cf84e
commit 3402d4260c
2 changed files with 133 additions and 33 deletions
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17
lib/Target/Mips/MipsCallingConv.td
View File

@ -16,18 +16,9 @@ class CCIfSubtarget<string F, CCAction A>:
//===----------------------------------------------------------------------===//
// Mips O32 Calling Convention
//===----------------------------------------------------------------------===//
def CC_MipsO32 : CallingConv<[
// Promote i8/i16 arguments to i32.
CCIfType<[i8, i16], CCPromoteToType<i32>>,
// The first 4 integer arguments are passed in integer registers.
CCIfType<[i32], CCAssignToReg<[A0, A1, A2, A3]>>,
// Integer values get stored in stack slots that are 4 bytes in
// size and 4-byte aligned.
CCIfType<[i32], CCAssignToStack<4, 4>>
]>;
// Only the return rules are defined here for O32. The rules for argument
// passing are defined in MipsISelLowering.cpp.
def RetCC_MipsO32 : CallingConv<[
// i32 are returned in registers V0, V1
CCIfType<[i32], CCAssignToReg<[V0, V1]>>,
@ -42,6 +33,7 @@ def RetCC_MipsO32 : CallingConv<[
//===----------------------------------------------------------------------===//
// Mips EABI Calling Convention
//===----------------------------------------------------------------------===//
def CC_MipsEABI : CallingConv<[
// Promote i8/i16 arguments to i32.
CCIfType<[i8, i16], CCPromoteToType<i32>>,
@ -85,8 +77,7 @@ def RetCC_MipsEABI : CallingConv<[
//===----------------------------------------------------------------------===//
def CC_Mips : CallingConv<[
CCIfSubtarget<"isABI_EABI()", CCDelegateTo<CC_MipsEABI>>,
CCDelegateTo<CC_MipsO32>
CCIfSubtarget<"isABI_EABI()", CCDelegateTo<CC_MipsEABI>>
]>;
def RetCC_Mips : CallingConv<[

149
lib/Target/Mips/MipsISelLowering.cpp
View File

@ -581,6 +581,85 @@ LowerConstantPool(SDValue Op, SelectionDAG &DAG)
#include "MipsGenCallingConv.inc"
//===----------------------------------------------------------------------===//
// TODO: Implement a generic logic using tblgen that can support this.
// Mips O32 ABI rules:
// ---
// i32 - Passed in A0, A1, A2, A3 and stack
// f32 - Only passed in f32 registers if no int reg has been used yet to hold
// an argument. Otherwise, passed in A1, A2, A3 and stack.
// f64 - Only passed in two aliased f32 registers if no int reg has been used
// yet to hold an argument. Otherwise, use A2, A3 and stack. If A1 is
// not used, it must be shadowed. If only A3 is avaiable, shadow it and
// go to stack.
//===----------------------------------------------------------------------===//
static bool CC_MipsO32(unsigned ValNo, MVT ValVT,
MVT LocVT, CCValAssign::LocInfo LocInfo,
ISD::ArgFlagsTy ArgFlags, CCState &State) {
static const unsigned IntRegsSize=4, FloatRegsSize=2;
static const unsigned IntRegs[] = {
Mips::A0, Mips::A1, Mips::A2, Mips::A3
};
static const unsigned F32Regs[] = {
Mips::F12, Mips::F14
};
static const unsigned F64Regs[] = {
Mips::D6, Mips::D7
};
unsigned Reg=0;
unsigned UnallocIntReg = State.getFirstUnallocated(IntRegs, IntRegsSize);
bool IntRegUsed = (IntRegs[UnallocIntReg] != (unsigned (Mips::A0)));
// Promote i8 and i16
if (LocVT == MVT::i8 || LocVT == MVT::i16) {
LocVT = MVT::i32;
if (ArgFlags.isSExt())
LocInfo = CCValAssign::SExt;
else if (ArgFlags.isZExt())
LocInfo = CCValAssign::ZExt;
else
LocInfo = CCValAssign::AExt;
}
if (ValVT == MVT::i32 || (ValVT == MVT::f32 && IntRegUsed)) {
Reg = State.AllocateReg(IntRegs, IntRegsSize);
IntRegUsed = true;
LocVT = MVT::i32;
}
if (ValVT.isFloatingPoint() && !IntRegUsed) {
if (ValVT == MVT::f32)
Reg = State.AllocateReg(F32Regs, FloatRegsSize);
else
Reg = State.AllocateReg(F64Regs, FloatRegsSize);
}
if (ValVT == MVT::f64 && IntRegUsed) {
if (UnallocIntReg != IntRegsSize) {
// If we hit register A3 as the first not allocated, we must
// mark it as allocated (shadow) and use the stack instead.
if (IntRegs[UnallocIntReg] != (unsigned (Mips::A3)))
Reg = Mips::A2;
for (;UnallocIntReg < IntRegsSize; ++UnallocIntReg)
State.AllocateReg(UnallocIntReg);
}
LocVT = MVT::i32;
}
if (!Reg) {
unsigned SizeInBytes = ValVT.getSizeInBits() >> 3;
unsigned Offset = State.AllocateStack(SizeInBytes, SizeInBytes);
State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
} else
State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
return false; // CC must always match
}
//===----------------------------------------------------------------------===//
// CALL Calling Convention Implementation
//===----------------------------------------------------------------------===//
@ -611,9 +690,9 @@ LowerCALL(SDValue Op, SelectionDAG &DAG)
if (Subtarget->isABI_O32()) {
int VTsize = MVT(MVT::i32).getSizeInBits()/8;
MFI->CreateFixedObject(VTsize, (VTsize*3));
}
CCInfo.AnalyzeCallOperands(TheCall, CC_Mips);
CCInfo.AnalyzeCallOperands(TheCall, CC_MipsO32);
} else
CCInfo.AnalyzeCallOperands(TheCall, CC_Mips);
// Get a count of how many bytes are to be pushed on the stack.
unsigned NumBytes = CCInfo.getNextStackOffset();
@ -630,15 +709,28 @@ LowerCALL(SDValue Op, SelectionDAG &DAG)
// Walk the register/memloc assignments, inserting copies/loads.
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
SDValue Arg = TheCall->getArg(i);
CCValAssign &VA = ArgLocs[i];
// Arguments start after the 5 first operands of ISD::CALL
SDValue Arg = TheCall->getArg(i);
// Promote the value if needed.
switch (VA.getLocInfo()) {
default: assert(0 && "Unknown loc info!");
case CCValAssign::Full: break;
case CCValAssign::Full:
if (Subtarget->isABI_O32() && VA.isRegLoc()) {
if (VA.getValVT() == MVT::f32 && VA.getLocVT() == MVT::i32)
Arg = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32, Arg);
if (VA.getValVT() == MVT::f64 && VA.getLocVT() == MVT::i32) {
Arg = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i64, Arg);
SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Arg,
DAG.getConstant(0, getPointerTy()));
SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Arg,
DAG.getConstant(1, getPointerTy()));
RegsToPass.push_back(std::make_pair(VA.getLocReg(), Lo));
RegsToPass.push_back(std::make_pair(VA.getLocReg()+1, Hi));
continue;
}
}
break;
case CCValAssign::SExt:
Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
break;
@ -657,7 +749,7 @@ LowerCALL(SDValue Op, SelectionDAG &DAG)
continue;
}
// Register cant get to this point...
// Register can't get to this point...
assert(VA.isMemLoc());
// Create the frame index object for this incoming parameter
@ -700,7 +792,6 @@ LowerCALL(SDValue Op, SelectionDAG &DAG)
else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee))
Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy());
// MipsJmpLink = #chain, #target_address, #opt_in_flags...
// = Chain, Callee, Reg#1, Reg#2, ...
//
@ -824,21 +915,24 @@ LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG)
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs);
CCInfo.AnalyzeFormalArguments(Op.getNode(), CC_Mips);
if (Subtarget->isABI_O32())
CCInfo.AnalyzeFormalArguments(Op.getNode(), CC_MipsO32);
else
CCInfo.AnalyzeFormalArguments(Op.getNode(), CC_Mips);
SmallVector<SDValue, 16> ArgValues;
SDValue StackPtr;
unsigned FirstStackArgLoc = (Subtarget->isABI_EABI() ? 0 : 16);
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
// Arguments stored on registers
if (VA.isRegLoc()) {
MVT RegVT = VA.getLocVT();
TargetRegisterClass *RC = 0;
if (RegVT == MVT::i32)
RC = Mips::CPURegsRegisterClass;
else if (RegVT == MVT::f32) {
@ -857,18 +951,33 @@ LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG)
unsigned Reg = AddLiveIn(DAG.getMachineFunction(), VA.getLocReg(), RC);
SDValue ArgValue = DAG.getCopyFromReg(Root, dl, Reg, RegVT);
// If this is an 8 or 16-bit value, it is really passed promoted
// If this is an 8 or 16-bit value, it has been passed promoted
// to 32 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,
if (VA.getLocInfo() != CCValAssign::Full) {
unsigned Opcode;
if (VA.getLocInfo() == CCValAssign::SExt)
Opcode = ISD::AssertSext;
else if (VA.getLocInfo() == CCValAssign::ZExt)
Opcode = ISD::AssertZext;
ArgValue = DAG.getNode(Opcode, 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);
}
// Handle O32 ABI cases: i32->f32 and (i32,i32)->f64
if (Subtarget->isABI_O32()) {
if (RegVT == MVT::i32 && VA.getValVT() == MVT::f32)
ArgValue = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, ArgValue);
if (RegVT == MVT::i32 && VA.getValVT() == MVT::f64) {
unsigned Reg2 = AddLiveIn(DAG.getMachineFunction(),
VA.getLocReg()+1, RC);
SDValue ArgValue2 = DAG.getCopyFromReg(Root, dl, Reg2, RegVT);
SDValue Hi = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, ArgValue);
SDValue Lo = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, ArgValue2);
ArgValue = DAG.getNode(ISD::BUILD_PAIR, dl, MVT::f64, Lo, Hi);
}
}
ArgValues.push_back(ArgValue);