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Use rip-rel addressing on win64 by default. For this we just

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defaults to small pic code model.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111741 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2010-08-21 17:21:11 +00:00
parent 9dd3e92e1d
commit 699647cabc
2 changed files with 19 additions and 15 deletions
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2
lib/Target/X86/X86Subtarget.cpp
View File

@ -73,7 +73,7 @@ ClassifyGlobalReference(const GlobalValue *GV, const TargetMachine &TM) const {
if (GV->hasDefaultVisibility() &&
(isDecl || GV->isWeakForLinker()))
return X86II::MO_GOTPCREL;
} else {
} else if (!isTargetWin64()) {
assert(isTargetELF() && "Unknown rip-relative target");
// Extra load is needed for all externally visible.

32
lib/Target/X86/X86TargetMachine.cpp
View File

@ -112,15 +112,21 @@ X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT,
InstrInfo(*this), JITInfo(*this), TLInfo(*this), TSInfo(*this),
ELFWriterInfo(*this) {
DefRelocModel = getRelocationModel();
// If no relocation model was picked, default as appropriate for the target.
if (getRelocationModel() == Reloc::Default) {
if (!Subtarget.isTargetDarwin())
setRelocationModel(Reloc::Static);
else if (Subtarget.is64Bit())
// Darwin defaults to PIC in 64 bit mode and dynamic-no-pic in 32 bit mode.
// Win64 requires rip-rel addressing, thus we force it to PIC. Otherwise we
// use static relocation model by default.
if (Subtarget.isTargetDarwin()) {
if (Subtarget.is64Bit())
setRelocationModel(Reloc::PIC_);
else
setRelocationModel(Reloc::DynamicNoPIC);
} else if (Subtarget.isTargetWin64())
setRelocationModel(Reloc::PIC_);
else
setRelocationModel(Reloc::DynamicNoPIC);
setRelocationModel(Reloc::Static);
}
assert(getRelocationModel() != Reloc::Default &&
@ -143,29 +149,27 @@ X86TargetMachine::X86TargetMachine(const Target &T, const std::string &TT,
Subtarget.isTargetDarwin() &&
is64Bit)
setRelocationModel(Reloc::PIC_);
// Determine the PICStyle based on the target selected.
if (getRelocationModel() == Reloc::Static) {
// Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
Subtarget.setPICStyle(PICStyles::None);
} else if (Subtarget.is64Bit()) {
// PIC in 64 bit mode is always rip-rel.
Subtarget.setPICStyle(PICStyles::RIPRel);
} else if (Subtarget.isTargetCygMing()) {
Subtarget.setPICStyle(PICStyles::None);
} else if (Subtarget.isTargetDarwin()) {
if (Subtarget.is64Bit())
Subtarget.setPICStyle(PICStyles::RIPRel);
else if (getRelocationModel() == Reloc::PIC_)
if (getRelocationModel() == Reloc::PIC_)
Subtarget.setPICStyle(PICStyles::StubPIC);
else {
assert(getRelocationModel() == Reloc::DynamicNoPIC);
Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
}
} else if (Subtarget.isTargetELF()) {
if (Subtarget.is64Bit())
Subtarget.setPICStyle(PICStyles::RIPRel);
else
Subtarget.setPICStyle(PICStyles::GOT);
Subtarget.setPICStyle(PICStyles::GOT);
}
// Finally, if we have "none" as our PIC style, force to static mode.
if (Subtarget.getPICStyle() == PICStyles::None)
setRelocationModel(Reloc::Static);