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switch a private implementation of GetFunctionSizeInBytes. 

This is probably not the best way to implement "Force LR to 
be spilled if the Thumb function size is > 2048." do this, 
it should use the branch shortening infrastructure, but I'm
just preserving functionality here.

llvm-svn: 109165
This commit is contained in:
Chris Lattner 2010-07-22 21:14:33 +00:00
parent e3befc7f4a
commit dab6888bb1
1 changed files with 14 additions and 1 deletions
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15
llvm/lib/Target/ARM/ARMBaseRegisterInfo.cpp
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@ -723,6 +723,19 @@ ARMBaseRegisterInfo::estimateRSStackSizeLimit(MachineFunction &MF) const {
return Limit; return Limit;
} }
static unsigned GetFunctionSizeInBytes(const MachineFunction &MF,
const ARMBaseInstrInfo &TII) {
unsigned FnSize = 0;
for (MachineFunction::const_iterator MBBI = MF.begin(), E = MF.end();
MBBI != E; ++MBBI) {
const MachineBasicBlock &MBB = *MBBI;
for (MachineBasicBlock::const_iterator I = MBB.begin(),E = MBB.end();
I != E; ++I)
FnSize += TII.GetInstSizeInBytes(I);
}
return FnSize;
}
void void
ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF, ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS) const { RegScavenger *RS) const {
@ -820,7 +833,7 @@ ARMBaseRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
bool ForceLRSpill = false; bool ForceLRSpill = false;
if (!LRSpilled && AFI->isThumb1OnlyFunction()) { if (!LRSpilled && AFI->isThumb1OnlyFunction()) {
unsigned FnSize = TII.GetFunctionSizeInBytes(MF); unsigned FnSize = GetFunctionSizeInBytes(MF, TII);
// Force LR to be spilled if the Thumb function size is > 2048. This enables // Force LR to be spilled if the Thumb function size is > 2048. This enables
// use of BL to implement far jump. If it turns out that it's not needed // use of BL to implement far jump. If it turns out that it's not needed
// then the branch fix up path will undo it. // then the branch fix up path will undo it.