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enhance codegen to put 16-bit character strings into the

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__TEXT,__ustring section on darwin.

llvm-svn: 78068
This commit is contained in:
Chris Lattner 2009-08-04 16:27:13 +00:00
parent ec75250455
commit 8f9a2d3c85
3 changed files with 18 additions and 19 deletions
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1
include/llvm/Target/TargetLoweringObjectFile.h
View File

@ -224,6 +224,7 @@ public:
class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
const MCSection *CStringSection;
const MCSection *UStringSection;
const MCSection *TextCoalSection;
const MCSection *ConstTextCoalSection;
const MCSection *ConstDataCoalSection;

32
lib/Target/TargetLoweringObjectFile.cpp
View File

@ -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;

4
test/CodeGen/X86/global-sections.ll
View File

@ -101,7 +101,7 @@
@G8 = constant [4 x i16] [ i16 1, i16 2, i16 3, i16 0 ]
; DARWIN: .const
; DARWIN: .section __TEXT,__ustring
; DARWIN: .globl _G8
; DARWIN: _G8:
@ -111,7 +111,7 @@
@G9 = constant [4 x i32] [ i32 1, i32 2, i32 3, i32 0 ]
; ARWIN: .const [[ already in const section]]
; DARWIN: .const
; DARWIN: .globl _G9
; DARWIN: _G9: