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557ccbef5f
Other objects can never reference the MergedGlobals symbol so external linkage is never needed. Using private instead of internal linkage means the object is more similar to what it looks like when global merging is not enabled, with the only difference being that the merged variables are addressed indirectly relative to the start of the section they are in. Also add aliases for merged variables with internal linkage, as this also makes the object be more like what it is when they are not merged. Differential Revision: http://reviews.llvm.org/D11942 llvm-svn: 244615
75 lines
2.2 KiB
LLVM
75 lines
2.2 KiB
LLVM
; RUN: llc -mtriple=aarch64-apple-ios -asm-verbose=false -aarch64-collect-loh=false \
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; RUN: -O1 -global-merge-group-by-use -global-merge-ignore-single-use \
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; RUN: %s -o - | FileCheck %s
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; Check that, at -O1, we only merge globals used in minsize functions.
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; We assume that globals of the same size aren't reordered inside a set.
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; We use -global-merge-ignore-single-use, and thus only expect one merged set.
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@m1 = internal global i32 0, align 4
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@n1 = internal global i32 0, align 4
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; CHECK-LABEL: f1:
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define void @f1(i32 %a1, i32 %a2) minsize nounwind {
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; CHECK-NEXT: adrp x8, [[SET:l__MergedGlobals]]@PAGE
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; CHECK-NEXT: add x8, x8, [[SET]]@PAGEOFF
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; CHECK-NEXT: stp w0, w1, [x8]
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; CHECK-NEXT: ret
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store i32 %a1, i32* @m1, align 4
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store i32 %a2, i32* @n1, align 4
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ret void
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}
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@m2 = internal global i32 0, align 4
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@n2 = internal global i32 0, align 4
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; CHECK-LABEL: f2:
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define void @f2(i32 %a1, i32 %a2) nounwind {
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; CHECK-NEXT: adrp x8, _m2@PAGE
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; CHECK-NEXT: adrp x9, _n2@PAGE
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; CHECK-NEXT: str w0, [x8, _m2@PAGEOFF]
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; CHECK-NEXT: str w1, [x9, _n2@PAGEOFF]
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; CHECK-NEXT: ret
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store i32 %a1, i32* @m2, align 4
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store i32 %a2, i32* @n2, align 4
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ret void
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}
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; If we have use sets partially overlapping between a minsize and a non-minsize
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; function, explicitly check that we only consider the globals used in the
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; minsize function for merging.
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@m3 = internal global i32 0, align 4
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@n3 = internal global i32 0, align 4
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; CHECK-LABEL: f3:
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define void @f3(i32 %a1, i32 %a2) minsize nounwind {
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; CHECK-NEXT: adrp x8, [[SET]]@PAGE
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; CHECK-NEXT: add x8, x8, [[SET]]@PAGEOFF
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; CHECK-NEXT: stp w0, w1, [x8, #8]
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; CHECK-NEXT: ret
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store i32 %a1, i32* @m3, align 4
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store i32 %a2, i32* @n3, align 4
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ret void
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}
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@n4 = internal global i32 0, align 4
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; CHECK-LABEL: f4:
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define void @f4(i32 %a1, i32 %a2) nounwind {
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; CHECK-NEXT: adrp x8, [[SET]]@PAGE
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; CHECK-NEXT: add x8, x8, [[SET]]@PAGEOFF
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; CHECK-NEXT: adrp x9, _n4@PAGE
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; CHECK-NEXT: str w0, [x8, #8]
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; CHECK-NEXT: str w1, [x9, _n4@PAGEOFF]
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; CHECK-NEXT: ret
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store i32 %a1, i32* @m3, align 4
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store i32 %a2, i32* @n4, align 4
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ret void
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}
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; CHECK-DAG: .zerofill __DATA,__bss,[[SET]],16,3
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; CHECK-DAG: .zerofill __DATA,__bss,_m2,4,2
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; CHECK-DAG: .zerofill __DATA,__bss,_n2,4,2
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; CHECK-DAG: .zerofill __DATA,__bss,_n4,4,2
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