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ReMat of load from stub in pic mode extends the life of pic base. Currently spiller doesn't do a good job of estimating the impact. Disable for now.

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llvm-svn: 49059
This commit is contained in:
Evan Cheng 2008-04-01 23:26:12 +00:00
parent f322cc7462
commit e1eee9570f
1 changed files with 6 additions and 0 deletions
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6
lib/Target/X86/X86InstrInfo.cpp
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@ -37,6 +37,10 @@ namespace {
cl::desc("Print instructions that the allocator wants to"
" fuse, but the X86 backend currently can't"),
cl::Hidden);
cl::opt<bool>
ReMatPICStubLoad("remat-pic-stub-load",
cl::desc("Re-materialize load from stub in PIC mode"),
cl::init(false), cl::Hidden);
}
X86InstrInfo::X86InstrInfo(X86TargetMachine &tm)
@ -782,6 +786,8 @@ bool X86InstrInfo::isReallyTriviallyReMaterializable(MachineInstr *MI) const {
if (BaseReg == 0)
return true;
// Allow re-materialization of PIC load.
if (!ReMatPICStubLoad && MI->getOperand(4).isGlobal())
return false;
MachineRegisterInfo &MRI = MI->getParent()->getParent()->getRegInfo();
bool isPICBase = false;
for (MachineRegisterInfo::def_iterator I = MRI.def_begin(BaseReg),