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Implement llvm.(frame|return)address(0) correctly. They are used by the LLVM JIT, among other

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applications


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11459 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-02-15 01:04:03 +00:00
parent b929bca027
commit 0e5b79c174
2 changed files with 50 additions and 0 deletions
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25
lib/Target/X86/InstSelectSimple.cpp
View File

@ -62,6 +62,7 @@ namespace {
MachineFunction *F; // The function we are compiling into
MachineBasicBlock *BB; // The current MBB we are compiling
int VarArgsFrameIndex; // FrameIndex for start of varargs area
int ReturnAddressIndex; // FrameIndex for the return address
std::map<Value*, unsigned> RegMap; // Mapping between Val's and SSA Regs
@ -86,6 +87,10 @@ namespace {
BB = &F->front();
// Set up a frame object for the return address. This is used by the
// llvm.returnaddress & llvm.frameaddress intrinisics.
ReturnAddressIndex = F->getFrameInfo()->CreateFixedObject(4, -4);
// Copy incoming arguments off of the stack...
LoadArgumentsToVirtualRegs(Fn);
@ -1157,6 +1162,8 @@ void ISel::LowerUnknownIntrinsicFunctionCalls(Function &F) {
case Intrinsic::va_start:
case Intrinsic::va_copy:
case Intrinsic::va_end:
case Intrinsic::returnaddress:
case Intrinsic::frameaddress:
case Intrinsic::memcpy:
case Intrinsic::memset:
// We directly implement these intrinsics
@ -1190,6 +1197,24 @@ void ISel::visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI) {
return;
case Intrinsic::va_end: return; // Noop on X86
case Intrinsic::returnaddress:
case Intrinsic::frameaddress:
TmpReg1 = getReg(CI);
if (cast<Constant>(CI.getOperand(1))->isNullValue()) {
if (ID == Intrinsic::returnaddress) {
// Just load the return address
addFrameReference(BuildMI(BB, X86::MOVmr32, 4, TmpReg1),
ReturnAddressIndex);
} else {
addFrameReference(BuildMI(BB, X86::LEAr32, 4, TmpReg1),
ReturnAddressIndex, -4);
}
} else {
// Values other than zero are not implemented yet.
BuildMI(BB, X86::MOVir32, 1, TmpReg1).addZImm(0);
}
return;
case Intrinsic::memcpy: {
assert(CI.getNumOperands() == 5 && "Illegal llvm.memcpy call!");
unsigned Align = 1;

25
lib/Target/X86/X86ISelSimple.cpp
View File

@ -62,6 +62,7 @@ namespace {
MachineFunction *F; // The function we are compiling into
MachineBasicBlock *BB; // The current MBB we are compiling
int VarArgsFrameIndex; // FrameIndex for start of varargs area
int ReturnAddressIndex; // FrameIndex for the return address
std::map<Value*, unsigned> RegMap; // Mapping between Val's and SSA Regs
@ -86,6 +87,10 @@ namespace {
BB = &F->front();
// Set up a frame object for the return address. This is used by the
// llvm.returnaddress & llvm.frameaddress intrinisics.
ReturnAddressIndex = F->getFrameInfo()->CreateFixedObject(4, -4);
// Copy incoming arguments off of the stack...
LoadArgumentsToVirtualRegs(Fn);
@ -1157,6 +1162,8 @@ void ISel::LowerUnknownIntrinsicFunctionCalls(Function &F) {
case Intrinsic::va_start:
case Intrinsic::va_copy:
case Intrinsic::va_end:
case Intrinsic::returnaddress:
case Intrinsic::frameaddress:
case Intrinsic::memcpy:
case Intrinsic::memset:
// We directly implement these intrinsics
@ -1190,6 +1197,24 @@ void ISel::visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI) {
return;
case Intrinsic::va_end: return; // Noop on X86
case Intrinsic::returnaddress:
case Intrinsic::frameaddress:
TmpReg1 = getReg(CI);
if (cast<Constant>(CI.getOperand(1))->isNullValue()) {
if (ID == Intrinsic::returnaddress) {
// Just load the return address
addFrameReference(BuildMI(BB, X86::MOVmr32, 4, TmpReg1),
ReturnAddressIndex);
} else {
addFrameReference(BuildMI(BB, X86::LEAr32, 4, TmpReg1),
ReturnAddressIndex, -4);
}
} else {
// Values other than zero are not implemented yet.
BuildMI(BB, X86::MOVir32, 1, TmpReg1).addZImm(0);
}
return;
case Intrinsic::memcpy: {
assert(CI.getNumOperands() == 5 && "Illegal llvm.memcpy call!");
unsigned Align = 1;