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Cygwin support. Patch by Anton Korobeynikov!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28672 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-06-02 22:38:37 +00:00
parent 936cd541b6
commit 3649b0efa5
2 changed files with 28 additions and 4 deletions
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9
lib/Target/X86/X86ISelDAGToDAG.cpp
View File

@ -129,6 +129,8 @@ namespace {
SDOperand &Base, SDOperand &Scale,
SDOperand &Index, SDOperand &Disp);
void EmitSpecialCodeForMain(MachineBasicBlock *BB, MachineFrameInfo *MFI);
inline void getAddressOperands(X86ISelAddressMode &AM, SDOperand &Base,
SDOperand &Scale, SDOperand &Index,
SDOperand &Disp) {
@ -250,8 +252,11 @@ void X86DAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
/// EmitSpecialCodeForMain - Emit any code that needs to be executed only in
/// the main function.
static void EmitSpecialCodeForMain(MachineBasicBlock *BB,
MachineFrameInfo *MFI) {
void X86DAGToDAGISel::EmitSpecialCodeForMain(MachineBasicBlock *BB,
MachineFrameInfo *MFI) {
if (Subtarget->TargetType == X86Subtarget::isCygwin)
BuildMI(BB, X86::CALLpcrel32, 1).addExternalSymbol("__main");
// Switch the FPU to 64-bit precision mode for better compatibility and speed.
int CWFrameIdx = MFI->CreateStackObject(2, 2);
addFrameReference(BuildMI(BB, X86::FNSTCW16m, 4), CWFrameIdx);

23
lib/Target/X86/X86RegisterInfo.cpp
View File

@ -14,9 +14,12 @@
#include "X86.h"
#include "X86RegisterInfo.h"
#include "X86Subtarget.h"
#include "X86TargetMachine.h"
#include "X86InstrBuilder.h"
#include "llvm/Constants.h"
#include "llvm/Type.h"
#include "llvm/Function.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineFunction.h"
@ -635,7 +638,14 @@ X86RegisterInfo::getCalleeSaveRegClasses() const {
// if frame pointer elimination is disabled.
//
static bool hasFP(MachineFunction &MF) {
return NoFramePointerElim || MF.getFrameInfo()->hasVarSizedObjects();
const Function* Fn = MF.getFunction();
const X86Subtarget* Subtarget = &MF.getTarget().getSubtarget<X86Subtarget>();
return (NoFramePointerElim ||
MF.getFrameInfo()->hasVarSizedObjects() ||
(Fn->hasExternalLinkage() &&
Fn->getName() == "main" &&
Subtarget->TargetType == X86Subtarget::isCygwin));
}
void X86RegisterInfo::
@ -730,6 +740,9 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
MachineBasicBlock::iterator MBBI = MBB.begin();
MachineFrameInfo *MFI = MF.getFrameInfo();
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
const Function* Fn = MF.getFunction();
const X86Subtarget* Subtarget = &MF.getTarget().getSubtarget<X86Subtarget>();
MachineInstr *MI;
// Get the number of bytes to allocate from the FrameInfo
@ -744,7 +757,6 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
// Round the size to a multiple of the alignment (don't forget the 4 byte
// offset though).
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
NumBytes = ((NumBytes+4)+Align-1)/Align*Align - 4;
}
@ -775,6 +787,13 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
MBB.insert(MBBI, MI);
}
// If it's main() on Cygwin\Mingw32 we should align stack as well
if (Fn->hasExternalLinkage() && Fn->getName() == "main" &&
Subtarget->TargetType == X86Subtarget::isCygwin) {
MI = BuildMI(X86::AND32ri, 2, X86::ESP).addImm(-Align);
MBB.insert(MBBI, MI);
}
}
void X86RegisterInfo::emitEpilogue(MachineFunction &MF,