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Improve Mips back-end's handling of DBG_VALUE.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134224 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka
2011-07-01 01:04:43 +00:00
parent 68c0dbc14f
commit c4f24eb584
5 changed files with 72 additions and 25 deletions
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57
lib/Target/Mips/MipsRegisterInfo.cpp
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@@ -35,6 +35,7 @@
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Analysis/DebugInfo.h"
#define GET_REGINFO_MC_DESC
#define GET_REGINFO_TARGET_DESC
@@ -179,30 +180,6 @@ eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
<< "spOffset : " << spOffset << "\n"
<< "stackSize : " << stackSize << "\n");
int Offset;
// Calculate final offset.
// - There is no need to change the offset if the frame object is one of the
// following: an outgoing argument, pointer to a dynamically allocated
// stack space or a $gp restore location,
// - If the frame object is any of the following, its offset must be adjusted
// by adding the size of the stack:
// incoming argument, callee-saved register location or local variable.
if (MipsFI->isOutArgFI(FrameIndex) || MipsFI->isGPFI(FrameIndex) ||
MipsFI->isDynAllocFI(FrameIndex))
Offset = spOffset;
else
Offset = spOffset + stackSize;
Offset += MI.getOperand(i-1).getImm();
DEBUG(errs() << "Offset : " << Offset << "\n" << "<--------->\n");
unsigned NewReg = 0;
int NewImm = 0;
MachineBasicBlock &MBB = *MI.getParent();
bool ATUsed;
unsigned FrameReg;
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
int MinCSFI = 0;
int MaxCSFI = -1;
@@ -218,12 +195,44 @@ eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
// 3. Locations for callee-saved registers.
// Everything else is referenced relative to whatever register
// getFrameRegister() returns.
unsigned FrameReg;
if (MipsFI->isOutArgFI(FrameIndex) || MipsFI->isDynAllocFI(FrameIndex) ||
(FrameIndex >= MinCSFI && FrameIndex <= MaxCSFI))
FrameReg = Mips::SP;
else
FrameReg = getFrameRegister(MF);
// Calculate final offset.
// - There is no need to change the offset if the frame object is one of the
// following: an outgoing argument, pointer to a dynamically allocated
// stack space or a $gp restore location,
// - If the frame object is any of the following, its offset must be adjusted
// by adding the size of the stack:
// incoming argument, callee-saved register location or local variable.
int Offset;
if (MipsFI->isOutArgFI(FrameIndex) || MipsFI->isGPFI(FrameIndex) ||
MipsFI->isDynAllocFI(FrameIndex))
Offset = spOffset;
else
Offset = spOffset + stackSize;
if (MI.isDebugValue()) {
MI.getOperand(i).ChangeToRegister(FrameReg, false /*isDef*/);
MI.getOperand(i+1).ChangeToImmediate(Offset);
return;
}
Offset += MI.getOperand(i-1).getImm();
DEBUG(errs() << "Offset : " << Offset << "\n" << "<--------->\n");
unsigned NewReg = 0;
int NewImm = 0;
MachineBasicBlock &MBB = *MI.getParent();
bool ATUsed;
// Offset fits in the 16-bit field
if (Offset < 0x8000 && Offset >= -0x8000) {
NewReg = FrameReg;