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If a global variable has a specified alignment that is less than the preferred

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alignment for its type, use the minimum of the specified alignment and the ABI
alignment. This fixes <rdar://problem/9275290>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129428 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron Zwarich 2011-04-13 06:03:16 +00:00
parent 8a7f4ecbc1
commit d8b88d8558
2 changed files with 15 additions and 2 deletions
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8
lib/Target/TargetData.cpp
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@ -617,8 +617,12 @@ uint64_t TargetData::getIndexedOffset(const Type *ptrTy, Value* const* Indices,
unsigned TargetData::getPreferredAlignment(const GlobalVariable *GV) const {
const Type *ElemType = GV->getType()->getElementType();
unsigned Alignment = getPrefTypeAlignment(ElemType);
if (GV->getAlignment() > Alignment)
Alignment = GV->getAlignment();
unsigned GVAlignment = GV->getAlignment();
if (GVAlignment >= Alignment) {
Alignment = GVAlignment;
} else if (GVAlignment != 0) {
Alignment = std::min(GVAlignment, getABITypeAlignment(ElemType));
}
if (GV->hasInitializer()) {
if (Alignment < 16) {

9
test/CodeGen/ARM/2011-04-12-AlignBug.ll Normal file
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@ -0,0 +1,9 @@
; RUN: llc < %s | FileCheck %s
target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:32:64-v128:32:128-a0:0:32-n32"
target triple = "thumbv7-apple-darwin10.0.0"
; CHECK: align 2
@.strA = linker_private unnamed_addr constant [4 x i8] c"bar\00"
; CHECK-NOT: align
@.strB = linker_private unnamed_addr constant [4 x i8] c"foo\00", align 1
@.strC = linker_private unnamed_addr constant [4 x i8] c"baz\00", section "__TEXT,__cstring,cstring_literals", align 1