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XCore target: Add large code model

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When using large code model:
Global objects larger than 'CodeModelLargeSize' bytes are placed in sections named with a trailing ".large"
The folded global address of such objects are lowered into the const pool.

During inspection it was noted that LowerConstantPool() was using a default offset of zero.
A fix was made, but due to only offsets of zero being generated, testing only verifies the change is not detrimental.

Correct the flags emitted for explicitly specified sections.

We assume the size of the object queried by getSectionForConstant() is never greater than CodeModelLargeSize.
To handle greater than CodeModelLargeSize, changes to AsmPrinter would be required.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196087 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Robert Lytton
2013-12-02 10:18:31 +00:00
parent 7112fa0523
commit 883abacb5b
6 changed files with 240 additions and 30 deletions
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15
lib/Target/XCore/XCoreTargetObjectFile.h
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@@ -14,11 +14,24 @@
namespace llvm {
static const unsigned CodeModelLargeSize = 256;
class XCoreTargetObjectFile : public TargetLoweringObjectFileELF {
const MCSection *BSSSectionLarge;
const MCSection *DataSectionLarge;
const MCSection *ReadOnlySectionLarge;
public:
void Initialize(MCContext &Ctx, const TargetMachine &TM);
// TODO: Classify globals as xcore wishes.
virtual const MCSection *
getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const;
virtual const MCSection *
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const;
virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
};
} // end namespace llvm