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On MachO, don't put non-private constants in mergeable sections.

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On MachO, putting a symbol that doesn't start with a 'L' or 'l' in one of the
__TEXT,__literal* sections prevents the linker from merging the context of the
section.

Since private GVs are the ones the get mangled to start with 'L' or 'l', we now
only put those on the __TEXT,__literal* sections.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216682 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2014-08-28 20:13:31 +00:00
parent 8317095e97
commit 4bb535027e
2 changed files with 27 additions and 6 deletions
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4
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
View File

@ -626,7 +626,9 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
cast<GlobalVariable>(GV)) < 32)
return UStringSection;
if (Kind.isMergeableConst()) {
// With MachO only variables whose corresponding symbol starts with 'l' or
// 'L' can be merged, so we only try merging GVs with private linkage.
if (GV->hasPrivateLinkage() && Kind.isMergeableConst()) {
if (Kind.isMergeableConst4())
return FourByteConstantSection;
if (Kind.isMergeableConst8())

29
test/CodeGen/X86/global-sections.ll
View File

@ -53,21 +53,20 @@ define void @F1() {
; _Complex long long const G4 = 34;
@G4 = unnamed_addr constant {i64,i64} { i64 34, i64 0 }
@G4 = private unnamed_addr constant {i64,i64} { i64 34, i64 0 }
; DARWIN: .section __TEXT,__literal16,16byte_literals
; DARWIN: _G4:
; DARWIN: L_G4:
; DARWIN: .long 34
; DARWIN-STATIC: .section __TEXT,__literal16,16byte_literals
; DARWIN-STATIC: _G4:
; DARWIN-STATIC: L_G4:
; DARWIN-STATIC: .long 34
; DARWIN64: .section __TEXT,__literal16,16byte_literals
; DARWIN64: _G4:
; DARWIN64: L_G4:
; DARWIN64: .quad 34
; int G5 = 47;
@G5 = global i32 47
@ -194,3 +193,23 @@ define void @F1() {
; WIN32-SECTIONS: L_G14:
; WIN32-SECTIONS: .asciz "foo"
; cannot be merged on MachO, but can on other formats.
@G15 = unnamed_addr constant i64 0
; LINUX: .section .rodata.cst8,"aM",@progbits,8
; LINUX: G15:
; DARWIN: .section __TEXT,__const
; DARWIN: _G15:
; DARWIN-STATIC: .section __TEXT,__const
; DARWIN-STATIC: _G15:
; DARWIN64: .section __TEXT,__const
; DARWIN64: _G15:
; LINUX-SECTIONS: .section .rodata.G15,"aM",@progbits,8
; LINUX-SECTIONS: G15:
; WIN32-SECTIONS: .section .rdata,"rd",one_only,_G15
; WIN32-SECTIONS: _G15: