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[IR] Allow increasing the alignment of dso-local globals.

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I think this is the actual important property; the previous visibility
check was an approximation.

Differential Revision: https://reviews.llvm.org/D53852

llvm-svn: 345790
This commit is contained in:
Eli Friedman 2018-10-31 23:03:58 +00:00
parent 723b57711f
commit 9d0e97f324
2 changed files with 8 additions and 2 deletions
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2
lib/IR/Globals.cpp
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@ -252,7 +252,7 @@ bool GlobalValue::canIncreaseAlignment() const {
// Conservatively assume ELF if there's no parent pointer.
bool isELF =
(!Parent || Triple(Parent->getTargetTriple()).isOSBinFormatELF());
if (isELF && hasDefaultVisibility() && !hasLocalLinkage())
if (isELF && !isDSOLocal())
return false;
return true;

8
test/CodeGen/ARM/memfunc.ll
View File

@ -388,6 +388,7 @@ entry:
@arr7 = external global [7 x i8], align 1
@arr8 = internal global [128 x i8] undef
@arr9 = weak_odr global [128 x i8] undef
@arr10 = dso_local global [8 x i8] c"\01\02\03\04\05\06\07\08", align 1
define void @f9(i8* %dest, i32 %n) "no-frame-pointer-elim"="true" {
entry:
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @arr1, i32 0, i32 0), i32 %n, i1 false)
@ -399,7 +400,7 @@ entry:
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* getelementptr inbounds ([7 x i8], [7 x i8]* @arr7, i32 0, i32 0), i32 %n, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* getelementptr inbounds ([128 x i8], [128 x i8]* @arr8, i32 0, i32 0), i32 %n, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* getelementptr inbounds ([128 x i8], [128 x i8]* @arr9, i32 0, i32 0), i32 %n, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* getelementptr inbounds ([8 x i8], [8 x i8]* @arr10, i32 0, i32 0), i32 %n, i1 false)
unreachable
}
@ -427,6 +428,11 @@ entry:
; CHECK-GNUEABI: arr8,128,16
; CHECK: .p2align 4
; CHECK: arr9:
; CHECK-IOS: .p2align 3
; CHECK-DARWIN: .p2align 2
; CHECK-EABI: .p2align 2
; CHECK-GNUEABI: .p2align 2
; CHECK: arr10:
; CHECK-NOT: arr7: