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Avoid relocations in a common case. 

llvm-svn: 114229
This commit is contained in:
Rafael Espindola 2010-09-17 22:34:41 +00:00
parent b330786d1f
commit 0ecde03e9f
1 changed files with 10 additions and 1 deletions
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11
llvm/lib/MC/ELFObjectWriter.cpp
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@ -470,12 +470,22 @@ void ELFObjectWriterImpl::RecordRelocation(const MCAssembler &Asm,
unsigned Index = 0;
int64_t Value = Target.getConstant();
bool IsPCRel = isFixupKindX86PCRel(Fixup.getKind());
if (!Target.isAbsolute()) {
const MCSymbol *Symbol = &Target.getSymA()->getSymbol();
MCSymbolData &SD = Asm.getSymbolData(*Symbol);
const MCSymbolData *Base = Asm.getAtom(Layout, &SD);
MCFragment *F = SD.getFragment();
// Avoid relocations for cases like jumps and calls in the same file.
if (Symbol->isDefined() && !SD.isExternal() &&
IsPCRel &&
&Fragment->getParent()->getSection() == &Symbol->getSection()) {
uint64_t FixupAddr = Layout.getFragmentAddress(Fragment) + Fixup.getOffset();
FixedValue = Layout.getSymbolAddress(&SD) + Target.getConstant() - FixupAddr;
return;
}
if (Base) {
if (F && (!Symbol->isInSection() || SD.isCommon()) && !SD.isExternal()) {
Index = F->getParent()->getOrdinal() + LocalSymbolData.size() + 1;
@ -507,7 +517,6 @@ void ELFObjectWriterImpl::RecordRelocation(const MCAssembler &Asm,
FixedValue = Value;
// determine the type of the relocation
bool IsPCRel = isFixupKindX86PCRel(Fixup.getKind());
unsigned Type;
if (Is64Bit) {
if (IsPCRel) {