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round zero-byte .zerofill directives up to 1 byte. This

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should fix some "g++.dg-struct-layout-1" failures, 
rdar://7886017

llvm-svn: 102421
This commit is contained in:
Chris Lattner 2010-04-27 07:41:44 +00:00
parent eee2e72653
commit a9c1328501
2 changed files with 16 additions and 0 deletions
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2
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
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@ -283,6 +283,8 @@ void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
// Handle the zerofill directive on darwin, which is a special form of BSS
// emission.
if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
if (Size == 0) Size = 1; // zerofill of 0 bytes is undefined.
// .globl _foo
OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
// .zerofill __DATA, __common, _foo, 400, 5

14
test/CodeGen/X86/global-sections.ll
View File

@ -144,3 +144,17 @@
; LINUX: G10:
; LINUX: .zero 400
;; Zero sized objects should round up to 1 byte in zerofill directives.
; rdar://7886017
@G11 = global [0 x i32] zeroinitializer
@G12 = global {} zeroinitializer
@G13 = global { [0 x {}] } zeroinitializer
; DARWIN: .globl _G11
; DARWIN: .zerofill __DATA,__common,_G11,1,2
; DARWIN: .globl _G12
; DARWIN: .zerofill __DATA,__common,_G12,1,3
; DARWIN: .globl _G13
; DARWIN: .zerofill __DATA,__common,_G13,1,3