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Implement the full V8 ABI for incoming arguments.

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llvm-svn: 24825
This commit is contained in:
Chris Lattner 2005-12-18 13:33:06 +00:00
parent 21ae63ceb9
commit b82f4641c4
2 changed files with 144 additions and 29 deletions
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171
lib/Target/SparcV8/SparcV8ISelDAGToDAG.cpp
View File

@ -13,6 +13,7 @@
#include "SparcV8.h"
#include "SparcV8TargetMachine.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
@ -129,56 +130,170 @@ SparcV8TargetLowering::SparcV8TargetLowering(TargetMachine &TM)
computeRegisterProperties();
}
/// LowerArguments - V8 uses a very simple ABI, where all values are passed in
/// either one or two GPRs, including FP values. TODO: we should pass FP values
/// in FP registers for fastcc functions.
std::vector<SDOperand>
SparcV8TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
MachineFunction &MF = DAG.getMachineFunction();
SSARegMap *RegMap = MF.getSSARegMap();
std::vector<SDOperand> ArgValues;
static const unsigned GPR[] = {
static const unsigned ArgRegs[] = {
V8::I0, V8::I1, V8::I2, V8::I3, V8::I4, V8::I5
};
unsigned ArgNo = 0;
const unsigned *CurArgReg = ArgRegs, *ArgRegEnd = ArgRegs+6;
unsigned ArgOffset = 68;
SDOperand Root = DAG.getRoot();
std::vector<SDOperand> OutChains;
for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) {
MVT::ValueType ObjectVT = getValueType(I->getType());
assert(ArgNo < 6 && "Only args in regs for now");
switch (ObjectVT) {
default: assert(0 && "Unhandled argument type!");
// TODO: MVT::i64 & FP
// TODO: FP
case MVT::i1:
case MVT::i8:
case MVT::i16:
case MVT::i32: {
unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
MF.addLiveIn(GPR[ArgNo++], VReg);
SDOperand Arg = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
DAG.setRoot(Arg.getValue(1));
if (ObjectVT != MVT::i32) {
unsigned AssertOp = I->getType()->isSigned() ? ISD::AssertSext
: ISD::AssertZext;
Arg = DAG.getNode(AssertOp, MVT::i32, Arg,
DAG.getValueType(ObjectVT));
Arg = DAG.getNode(ISD::TRUNCATE, ObjectVT, Arg);
case MVT::i32:
if (I->use_empty()) { // Argument is dead.
if (CurArgReg < ArgRegEnd) ++CurArgReg;
ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
} else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
MF.addLiveIn(*CurArgReg++, VReg);
SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32);
if (ObjectVT != MVT::i32) {
unsigned AssertOp = I->getType()->isSigned() ? ISD::AssertSext
: ISD::AssertZext;
Arg = DAG.getNode(AssertOp, MVT::i32, Arg,
DAG.getValueType(ObjectVT));
Arg = DAG.getNode(ISD::TRUNCATE, ObjectVT, Arg);
}
ArgValues.push_back(Arg);
} else {
int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
SDOperand Load;
if (ObjectVT == MVT::i32) {
Load = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0));
} else {
unsigned LoadOp =
I->getType()->isSigned() ? ISD::SEXTLOAD : ISD::ZEXTLOAD;
Load = DAG.getExtLoad(LoadOp, MVT::i32, Root, FIPtr,
DAG.getSrcValue(0), ObjectVT);
}
ArgValues.push_back(Load);
}
ArgValues.push_back(Arg);
ArgOffset += 4;
break;
}
case MVT::i64: {
unsigned VRegHi = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
MF.addLiveIn(GPR[ArgNo++], VRegHi);
unsigned VRegLo = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
MF.addLiveIn(GPR[ArgNo++], VRegLo);
SDOperand ArgLo = DAG.getCopyFromReg(DAG.getRoot(), VRegLo, MVT::i32);
SDOperand ArgHi = DAG.getCopyFromReg(ArgLo.getValue(1), VRegHi, MVT::i32);
DAG.setRoot(ArgHi.getValue(1));
ArgValues.push_back(DAG.getNode(ISD::BUILD_PAIR, MVT::i64, ArgLo, ArgHi));
case MVT::f32:
if (I->use_empty()) { // Argument is dead.
if (CurArgReg < ArgRegEnd) ++CurArgReg;
ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
} else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
// FP value is passed in an integer register.
unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
MF.addLiveIn(*CurArgReg++, VReg);
SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32);
// We use the stack space that is already reserved for this reg.
int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
SDOperand SV = DAG.getSrcValue(0);
SDOperand Store = DAG.getNode(ISD::STORE, MVT::Other, Root,
Arg, FIPtr, SV);
ArgValues.push_back(DAG.getLoad(MVT::f32, Store, FIPtr, SV));
}
ArgOffset += 4;
break;
case MVT::i64:
case MVT::f64:
if (I->use_empty()) { // Argument is dead.
if (CurArgReg < ArgRegEnd) ++CurArgReg;
if (CurArgReg < ArgRegEnd) ++CurArgReg;
ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
} else if (CurArgReg == ArgRegEnd && ObjectVT == MVT::f64 &&
((CurArgReg-ArgRegs) & 1) == 0) {
// If this is a double argument and the whole thing lives on the stack,
// and the argument is aligned, load the double straight from the stack.
// We can't do a load in cases like void foo([6ints], int,double),
// because the double wouldn't be aligned!
int FrameIdx = MF.getFrameInfo()->CreateFixedObject(8, ArgOffset);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
ArgValues.push_back(DAG.getLoad(MVT::f64, Root, FIPtr,
DAG.getSrcValue(0)));
} else {
SDOperand HiVal;
if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
unsigned VRegHi = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
MF.addLiveIn(*CurArgReg++, VRegHi);
HiVal = DAG.getCopyFromReg(Root, VRegHi, MVT::i32);
} else {
int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
HiVal = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0));
}
SDOperand LoVal;
if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
unsigned VRegLo = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
MF.addLiveIn(*CurArgReg++, VRegLo);
LoVal = DAG.getCopyFromReg(Root, VRegLo, MVT::i32);
} else {
int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset+4);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
LoVal = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0));
}
// Compose the two halves together into an i64 unit.
SDOperand WholeValue =
DAG.getNode(ISD::BUILD_PAIR, MVT::i64, LoVal, HiVal);
if (ObjectVT == MVT::i64) {
// If we are emitting an i64, this is what we want.
ArgValues.push_back(WholeValue);
} else {
assert(ObjectVT == MVT::f64);
// Otherwise, emit a store to the stack and reload into FPR.
int FrameIdx = MF.getFrameInfo()->CreateStackObject(8, 8);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
SDOperand SV = DAG.getSrcValue(0);
SDOperand Store = DAG.getNode(ISD::STORE, MVT::Other, Root,
WholeValue, FIPtr, SV);
ArgValues.push_back(DAG.getLoad(MVT::f64, Store, FIPtr, SV));
}
}
ArgOffset += 8;
break;
}
}
}
assert(!F.isVarArg() && "Unimp");
// Store remaining ArgRegs to the stack if this is a varargs function.
if (F.getFunctionType()->isVarArg()) {
for (; CurArgReg != ArgRegEnd; ++CurArgReg) {
unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
MF.addLiveIn(*CurArgReg, VReg);
SDOperand Arg = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
OutChains.push_back(DAG.getNode(ISD::STORE, MVT::Other, DAG.getRoot(),
Arg, FIPtr, DAG.getSrcValue(0)));
ArgOffset += 4;
}
}
if (!OutChains.empty())
DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, OutChains));
// Finally, inform the code generator which regs we return values in.
switch (getValueType(F.getReturnType())) {

2
lib/Target/SparcV8/SparcV8ISelSimple.cpp
View File

@ -367,7 +367,7 @@ void V8ISel::LoadArgumentsToVirtualRegs (Function *LF) {
// FIXME: We could avoid storing any args onto the stack that don't
// need to be in memory, because they come before the ellipsis in the
// parameter list (and thus could never be accessed through va_arg).
if (LF->getFunctionType ()->isVarArg ()) {
if (LF->getFunctionType()->isVarArg()) {
for (unsigned i = 0; i < 6; ++i) {
int FI = F->getFrameInfo()->CreateFixedObject(4, ArgOffset);
assert (IAR != IAREnd