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35e8055393
Instead of merging everything together, look at the users of GlobalVariables, and try to group them by function, to create sets of globals used "together". Using that information, a less-aggressive alternative is to keep merging everything together *except* globals that are only ever used alone, that is, those for which it's clearly non-profitable to merge with others. In my testing, grouping by Function is too aggressive, but grouping by BasicBlock is too conservative. Anything in-between isn't trivially available, so stick with Function grouping for now. cl::opts are added for testing; both enabled by default. A few of the testcases aren't testing the merging proper, but just various edge cases when merging does occur. Update them to use the previous grouping behavior. Also, one of the tests is unrelated to GlobalMerge; change it accordingly. While there, switch to r234666' flags rather than the brutal -O3. Differential Revision: http://reviews.llvm.org/D8070 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235249 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
2.7 KiB
LLVM
95 lines
2.7 KiB
LLVM
; RUN: llc -mtriple=aarch64-apple-ios -asm-verbose=false -aarch64-collect-loh=false \
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; RUN: -aarch64-global-merge -global-merge-group-by-use -global-merge-ignore-single-use=false \
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; RUN: %s -o - | FileCheck %s
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; We assume that globals of the same size aren't reordered inside a set.
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; Check that we create two MergedGlobal instances for two functions using
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; disjoint sets of globals
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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) #0 {
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; CHECK-NEXT: adrp x8, [[SET1:__MergedGlobals[0-9]*]]@PAGE
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; CHECK-NEXT: add x8, x8, [[SET1]]@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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@o2 = internal global i32 0, align 4
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; CHECK-LABEL: f2:
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define void @f2(i32 %a1, i32 %a2, i32 %a3) #0 {
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; CHECK-NEXT: adrp x8, [[SET2:__MergedGlobals[0-9]*]]@PAGE
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; CHECK-NEXT: add x8, x8, [[SET2]]@PAGEOFF
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; CHECK-NEXT: stp w0, w1, [x8]
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; CHECK-NEXT: str w2, [x8, #8]
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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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store i32 %a3, i32* @o2, align 4
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ret void
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}
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; Sanity-check (don't worry about cost models) that we pick the biggest subset
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; of all global used "together" directly or indirectly. Here, that means
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; merging n3, m4, and n4 together, but ignoring m3.
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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) #0 {
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; CHECK-NEXT: adrp x8, _m3@PAGE
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; CHECK-NEXT: adrp x9, [[SET3:__MergedGlobals[0-9]*]]@PAGE
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; CHECK-NEXT: str w0, [x8, _m3@PAGEOFF]
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; CHECK-NEXT: str w1, [x9, [[SET3]]@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* @n3, align 4
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ret void
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}
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@m4 = internal global i32 0, align 4
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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, i32 %a3) #0 {
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; CHECK-NEXT: adrp x8, [[SET3]]@PAGE
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; CHECK-NEXT: add x8, x8, [[SET3]]@PAGEOFF
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; CHECK-NEXT: stp w0, w1, [x8, #4]
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; CHECK-NEXT: str w2, [x8]
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; CHECK-NEXT: ret
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store i32 %a1, i32* @m4, align 4
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store i32 %a2, i32* @n4, align 4
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store i32 %a3, i32* @n3, align 4
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ret void
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}
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; Finally, check that we don't do anything with one-element global sets.
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@o5 = internal global i32 0, align 4
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; CHECK-LABEL: f5:
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define void @f5(i32 %a1) #0 {
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; CHECK-NEXT: adrp x8, _o5@PAGE
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; CHECK-NEXT: str w0, [x8, _o5@PAGEOFF]
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; CHECK-NEXT: ret
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store i32 %a1, i32* @o5, align 4
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ret void
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}
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; CHECK-DAG: .zerofill __DATA,__bss,_o5,4,2
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; CHECK-DAG: .zerofill __DATA,__bss,[[SET1]],8,3
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; CHECK-DAG: .zerofill __DATA,__bss,[[SET2]],12,3
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; CHECK-DAG: .zerofill __DATA,__bss,[[SET3]],12,3
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attributes #0 = { nounwind }
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