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enhance codegen to put 16-bit character strings into the

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__TEXT,__ustring section on darwin.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78068 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-08-04 16:27:13 +00:00
parent 7e88a50428
commit ec409759e9
3 changed files with 18 additions and 19 deletions
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32
lib/Target/TargetLoweringObjectFile.cpp
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@ -593,11 +593,13 @@ void TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx,
SectionKind::getDataRel());
CStringSection = getOrCreateSection("\t.cstring", true,
SectionKind::getMergeable1ByteCString());
SectionKind::getMergeable1ByteCString());
UStringSection = getOrCreateSection("__TEXT,__ustring", false,
SectionKind::getMergeable2ByteCString());
FourByteConstantSection = getOrCreateSection("\t.literal4\n", true,
SectionKind::getMergeableConst4());
SectionKind::getMergeableConst4());
EightByteConstantSection = getOrCreateSection("\t.literal8\n", true,
SectionKind::getMergeableConst8());
SectionKind::getMergeableConst8());
// ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back
// to using it in -static mode.
@ -704,18 +706,15 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
}
// FIXME: Alignment check should be handled by section classifier.
if (Kind.isMergeable1ByteCString()) {
Constant *C = cast<GlobalVariable>(GV)->getInitializer();
const Type *Ty = cast<ArrayType>(C->getType())->getElementType();
const TargetData &TD = *TM.getTargetData();
unsigned Size = TD.getTypeAllocSize(Ty);
if (Size) {
unsigned Align = TD.getPreferredAlignment(cast<GlobalVariable>(GV));
if (Align <= 32)
if (Kind.isMergeable1ByteCString() ||
Kind.isMergeable2ByteCString()) {
if (TM.getTargetData()->getPreferredAlignment(
cast<GlobalVariable>(GV)) < 32) {
if (Kind.isMergeable1ByteCString())
return CStringSection;
assert(Kind.isMergeable2ByteCString());
return UStringSection;
}
return ReadOnlySection;
}
if (Kind.isMergeableConst()) {
@ -725,11 +724,10 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
return EightByteConstantSection;
if (Kind.isMergeableConst16() && SixteenByteConstantSection)
return SixteenByteConstantSection;
return ReadOnlySection; // .const
}
// FIXME: ROData -> const in -static mode that is relocatable but they happen
// by the static linker. Why not mergeable?
// Otherwise, if it is readonly, but not something we can specially optimize,
// just drop it in .const.
if (Kind.isReadOnly())
return ReadOnlySection;