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The base pointer save offset can be computed at initialization time,

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do so and fix up the calls.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229169 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher 2015-02-13 22:48:53 +00:00
parent f7f32530e0
commit 40ccb77781
2 changed files with 20 additions and 23 deletions
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32
lib/Target/PowerPC/PPCFrameLowering.cpp
View File

@ -16,6 +16,7 @@
#include "PPCInstrInfo.h"
#include "PPCMachineFunctionInfo.h"
#include "PPCSubtarget.h"
#include "PPCTargetMachine.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
@ -68,13 +69,26 @@ static unsigned computeLinkageSize(const PPCSubtarget &STI) {
return 8;
}
static unsigned computeBasePointerSaveOffset(const PPCSubtarget &STI) {
if (STI.isDarwinABI())
return STI.isPPC64() ? -16U : -8U;
// SVR4 ABI: First slot in the general register save area.
return STI.isPPC64()
? -16U
: (STI.getTargetMachine().getRelocationModel() == Reloc::PIC_)
? -12U
: -8U;
}
PPCFrameLowering::PPCFrameLowering(const PPCSubtarget &STI)
: TargetFrameLowering(TargetFrameLowering::StackGrowsDown,
(STI.hasQPX() || STI.isBGQ()) ? 32 : 16, 0),
Subtarget(STI), ReturnSaveOffset(computeReturnSaveOffset(Subtarget)),
TOCSaveOffset(computeTOCSaveOffset(Subtarget)),
FramePointerSaveOffset(computeFramePointerSaveOffset(Subtarget)),
LinkageSize(computeLinkageSize(Subtarget)) {}
LinkageSize(computeLinkageSize(Subtarget)),
BasePointerSaveOffset(computeBasePointerSaveOffset(STI)) {}
// With the SVR4 ABI, callee-saved registers have fixed offsets on the stack.
const PPCFrameLowering::SpillSlot *PPCFrameLowering::getCalleeSavedSpillSlots(
@ -557,7 +571,6 @@ void PPCFrameLowering::emitPrologue(MachineFunction &MF) const {
DebugLoc dl;
bool needsCFI = MMI.hasDebugInfo() ||
MF.getFunction()->needsUnwindTableEntry();
bool isPIC = MF.getTarget().getRelocationModel() == Reloc::PIC_;
// Get processor type.
bool isPPC64 = Subtarget.isPPC64();
@ -653,10 +666,7 @@ void PPCFrameLowering::emitPrologue(MachineFunction &MF) const {
assert(BPIndex && "No Base Pointer Save Slot!");
BPOffset = FFI->getObjectOffset(BPIndex);
} else {
BPOffset =
PPCFrameLowering::getBasePointerSaveOffset(isPPC64,
isDarwinABI,
isPIC);
BPOffset = getBasePointerSaveOffset();
}
}
@ -938,9 +948,7 @@ void PPCFrameLowering::emitEpilogue(MachineFunction &MF,
// Get processor type.
bool isPPC64 = Subtarget.isPPC64();
// Get the ABI.
bool isDarwinABI = Subtarget.isDarwinABI();
bool isSVR4ABI = Subtarget.isSVR4ABI();
bool isPIC = MF.getTarget().getRelocationModel() == Reloc::PIC_;
// Check if the link register (LR) has been saved.
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
@ -990,10 +998,7 @@ void PPCFrameLowering::emitEpilogue(MachineFunction &MF,
assert(BPIndex && "No Base Pointer Save Slot!");
BPOffset = FFI->getObjectOffset(BPIndex);
} else {
BPOffset =
PPCFrameLowering::getBasePointerSaveOffset(isPPC64,
isDarwinABI,
isPIC);
BPOffset = getBasePointerSaveOffset();
}
}
@ -1172,7 +1177,6 @@ PPCFrameLowering::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
int FPSI = FI->getFramePointerSaveIndex();
bool isPPC64 = Subtarget.isPPC64();
bool isDarwinABI = Subtarget.isDarwinABI();
bool isPIC = MF.getTarget().getRelocationModel() == Reloc::PIC_;
MachineFrameInfo *MFI = MF.getFrameInfo();
// If the frame pointer save index hasn't been defined yet.
@ -1187,7 +1191,7 @@ PPCFrameLowering::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
int BPSI = FI->getBasePointerSaveIndex();
if (!BPSI && RegInfo->hasBasePointer(MF)) {
int BPOffset = getBasePointerSaveOffset(isPPC64, isDarwinABI, isPIC);
int BPOffset = getBasePointerSaveOffset();
// Allocate the frame index for the base pointer save area.
BPSI = MFI->CreateFixedObject(isPPC64? 8 : 4, BPOffset, true);
// Save the result.

11
lib/Target/PowerPC/PPCFrameLowering.h
View File

@ -27,6 +27,7 @@ class PPCFrameLowering: public TargetFrameLowering {
const unsigned TOCSaveOffset;
const unsigned FramePointerSaveOffset;
const unsigned LinkageSize;
const unsigned BasePointerSaveOffset;
public:
PPCFrameLowering(const PPCSubtarget &STI);
@ -83,15 +84,7 @@ public:
/// getBasePointerSaveOffset - Return the previous frame offset to save the
/// base pointer.
static unsigned getBasePointerSaveOffset(bool isPPC64,
bool isDarwinABI,
bool isPIC) {
if (isDarwinABI)
return isPPC64 ? -16U : -8U;
// SVR4 ABI: First slot in the general register save area.
return isPPC64 ? -16U : isPIC ? -12U : -8U;
}
unsigned getBasePointerSaveOffset() const { return BasePointerSaveOffset; }
/// getLinkageSize - Return the size of the PowerPC ABI linkage area.
///