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CodeGen: Stick constant pool entries in COMDAT sections for WinCOFF

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COFF lacks a feature that other object file formats support: mergeable
sections.

To work around this, MSVC sticks constant pool entries in special COMDAT
sections so that each constant is in it's own section.  This permits
unused constants to be dropped and it also allows duplicate constants in
different translation units to get merged together.

This fixes PR20262.

Differential Revision: http://reviews.llvm.org/D4482

llvm-svn: 213006
This commit is contained in:
David Majnemer
2014-07-14 22:57:27 +00:00
parent 2034ac8181
commit 8bce66b093
16 changed files with 191 additions and 27 deletions
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5
llvm/lib/Target/XCore/XCoreTargetObjectFile.cpp
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@@ -165,8 +165,9 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, Mangler &Mang,
report_fatal_error("Target does not support TLS or Common sections");
}
const MCSection *XCoreTargetObjectFile::
getSectionForConstant(SectionKind Kind) const {
const MCSection *
XCoreTargetObjectFile::getSectionForConstant(SectionKind Kind,
const Constant *C) const {
if (Kind.isMergeableConst4()) return MergeableConst4Section;
if (Kind.isMergeableConst8()) return MergeableConst8Section;
if (Kind.isMergeableConst16()) return MergeableConst16Section;