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Disable external stubs for X86-32 and X86-64

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Instruction selection for X86 now can choose an instruction
sequence that will fit any address of any symbol, no matter
the pointer width. X86-64 uses a mov+call-via-reg sequence
for this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95323 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Phoenix 2010-02-04 19:56:59 +00:00
parent 6fdce65902
commit 85bb54f964
2 changed files with 11 additions and 3 deletions
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5
include/llvm/CodeGen/MachineRelocation.h
View File

@ -138,14 +138,15 @@ public:
///
static MachineRelocation getExtSym(uintptr_t offset, unsigned RelocationType,
const char *ES, intptr_t cst = 0,
bool GOTrelative = 0) {
bool GOTrelative = 0,
bool NeedStub = true) {
assert((RelocationType & ~63) == 0 && "Relocation type too large!");
MachineRelocation Result;
Result.Offset = offset;
Result.ConstantVal = cst;
Result.TargetReloType = RelocationType;
Result.AddrType = isExtSym;
Result.MayNeedFarStub = true;
Result.MayNeedFarStub = NeedStub;
Result.GOTRelative = GOTrelative;
Result.TargetResolve = false;
Result.Target.ExtSym = ES;

9
lib/Target/X86/X86CodeEmitter.cpp
View File

@ -191,8 +191,15 @@ template<class CodeEmitter>
void Emitter<CodeEmitter>::emitExternalSymbolAddress(const char *ES,
unsigned Reloc) {
intptr_t RelocCST = (Reloc == X86::reloc_picrel_word) ? PICBaseOffset : 0;
// X86 never needs stubs because instruction selection will always pick
// an instruction sequence that is large enough to hold any address
// to a symbol.
// (see X86ISelLowering.cpp, near 2039: X86TargetLowering::LowerCall)
bool NeedStub = false;
MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
Reloc, ES, RelocCST));
Reloc, ES, RelocCST,
0, NeedStub));
if (Reloc == X86::reloc_absolute_dword)
MCE.emitDWordLE(0);
else