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fa8edc9a41
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 llvm-svn: 235249
131 lines
7.3 KiB
LLVM
131 lines
7.3 KiB
LLVM
; RUN: llc -arm-global-merge -global-merge-group-by-use=false -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:32-n32"
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target triple = "thumbv7-apple-darwin10"
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@x1 = internal global i8 1, align 1
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@x2 = internal global i8 1, align 1
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@x3 = internal global i8 1, align 1
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@x4 = internal global i8 1, align 1
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@x5 = global i8 1, align 1
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; Check debug info output for merged global.
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; DW_AT_location
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; 0x03 DW_OP_addr
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; 0x.. .long __MergedGlobals
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; 0x10 DW_OP_constu
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; 0x.. offset
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; 0x22 DW_OP_plus
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; CHECK: DW_TAG_variable
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "x1"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_AT_location [DW_FORM_exprloc] (<0x8> 03 [[ADDR:.. .. .. ..]] 10 00 22 )
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; CHECK: DW_TAG_variable
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "x2"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_AT_location [DW_FORM_exprloc] (<0x8> 03 [[ADDR]] 10 01 22 )
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define zeroext i8 @get1(i8 zeroext %a) nounwind optsize {
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entry:
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tail call void @llvm.dbg.value(metadata i8 %a, i64 0, metadata !10, metadata !MDExpression()), !dbg !30
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%0 = load i8, i8* @x1, align 4, !dbg !30
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tail call void @llvm.dbg.value(metadata i8 %0, i64 0, metadata !11, metadata !MDExpression()), !dbg !30
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store i8 %a, i8* @x1, align 4, !dbg !30
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ret i8 %0, !dbg !31
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}
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
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define zeroext i8 @get2(i8 zeroext %a) nounwind optsize {
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entry:
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tail call void @llvm.dbg.value(metadata i8 %a, i64 0, metadata !18, metadata !MDExpression()), !dbg !32
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%0 = load i8, i8* @x2, align 4, !dbg !32
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tail call void @llvm.dbg.value(metadata i8 %0, i64 0, metadata !19, metadata !MDExpression()), !dbg !32
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store i8 %a, i8* @x2, align 4, !dbg !32
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ret i8 %0, !dbg !33
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}
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define zeroext i8 @get3(i8 zeroext %a) nounwind optsize {
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entry:
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tail call void @llvm.dbg.value(metadata i8 %a, i64 0, metadata !21, metadata !MDExpression()), !dbg !34
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%0 = load i8, i8* @x3, align 4, !dbg !34
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tail call void @llvm.dbg.value(metadata i8 %0, i64 0, metadata !22, metadata !MDExpression()), !dbg !34
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store i8 %a, i8* @x3, align 4, !dbg !34
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ret i8 %0, !dbg !35
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}
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define zeroext i8 @get4(i8 zeroext %a) nounwind optsize {
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entry:
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tail call void @llvm.dbg.value(metadata i8 %a, i64 0, metadata !24, metadata !MDExpression()), !dbg !36
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%0 = load i8, i8* @x4, align 4, !dbg !36
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tail call void @llvm.dbg.value(metadata i8 %0, i64 0, metadata !25, metadata !MDExpression()), !dbg !36
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store i8 %a, i8* @x4, align 4, !dbg !36
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ret i8 %0, !dbg !37
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}
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define zeroext i8 @get5(i8 zeroext %a) nounwind optsize {
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entry:
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tail call void @llvm.dbg.value(metadata i8 %a, i64 0, metadata !27, metadata !MDExpression()), !dbg !38
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%0 = load i8, i8* @x5, align 4, !dbg !38
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tail call void @llvm.dbg.value(metadata i8 %0, i64 0, metadata !28, metadata !MDExpression()), !dbg !38
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store i8 %a, i8* @x5, align 4, !dbg !38
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ret i8 %0, !dbg !39
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}
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!49}
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!0 = !MDSubprogram(name: "get1", linkageName: "get1", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 4, file: !47, scope: !1, type: !3, function: i8 (i8)* @get1, variables: !42)
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!1 = !MDFile(filename: "foo.c", directory: "/tmp/")
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!2 = !MDCompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2369.8)", isOptimized: true, emissionKind: 0, file: !47, enums: !48, retainedTypes: !48, subprograms: !40, globals: !41, imports: !48)
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!3 = !MDSubroutineType(types: !4)
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!4 = !{!5, !5}
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!5 = !MDBasicType(tag: DW_TAG_base_type, name: "_Bool", size: 8, align: 8, encoding: DW_ATE_boolean)
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!6 = !MDSubprogram(name: "get2", linkageName: "get2", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 7, file: !47, scope: !1, type: !3, function: i8 (i8)* @get2, variables: !43)
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!7 = !MDSubprogram(name: "get3", linkageName: "get3", line: 10, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 10, file: !47, scope: !1, type: !3, function: i8 (i8)* @get3, variables: !44)
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!8 = !MDSubprogram(name: "get4", linkageName: "get4", line: 13, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 13, file: !47, scope: !1, type: !3, function: i8 (i8)* @get4, variables: !45)
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!9 = !MDSubprogram(name: "get5", linkageName: "get5", line: 16, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 16, file: !47, scope: !1, type: !3, function: i8 (i8)* @get5, variables: !46)
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!10 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "a", line: 4, arg: 0, scope: !0, file: !1, type: !5)
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!11 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "b", line: 4, scope: !12, file: !1, type: !5)
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!12 = distinct !MDLexicalBlock(line: 4, column: 0, file: !47, scope: !0)
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!13 = !MDGlobalVariable(name: "x1", line: 3, isLocal: true, isDefinition: true, scope: !1, file: !1, type: !5, variable: i8* @x1)
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!14 = !MDGlobalVariable(name: "x2", line: 6, isLocal: true, isDefinition: true, scope: !1, file: !1, type: !5, variable: i8* @x2)
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!15 = !MDGlobalVariable(name: "x3", line: 9, isLocal: true, isDefinition: true, scope: !1, file: !1, type: !5, variable: i8* @x3)
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!16 = !MDGlobalVariable(name: "x4", line: 12, isLocal: true, isDefinition: true, scope: !1, file: !1, type: !5, variable: i8* @x4)
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!17 = !MDGlobalVariable(name: "x5", line: 15, isLocal: false, isDefinition: true, scope: !1, file: !1, type: !5, variable: i8* @x5)
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!18 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "a", line: 7, arg: 0, scope: !6, file: !1, type: !5)
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!19 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "b", line: 7, scope: !20, file: !1, type: !5)
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!20 = distinct !MDLexicalBlock(line: 7, column: 0, file: !47, scope: !6)
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!21 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "a", line: 10, arg: 0, scope: !7, file: !1, type: !5)
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!22 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "b", line: 10, scope: !23, file: !1, type: !5)
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!23 = distinct !MDLexicalBlock(line: 10, column: 0, file: !47, scope: !7)
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!24 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "a", line: 13, arg: 0, scope: !8, file: !1, type: !5)
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!25 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "b", line: 13, scope: !26, file: !1, type: !5)
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!26 = distinct !MDLexicalBlock(line: 13, column: 0, file: !47, scope: !8)
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!27 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "a", line: 16, arg: 0, scope: !9, file: !1, type: !5)
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!28 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "b", line: 16, scope: !29, file: !1, type: !5)
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!29 = distinct !MDLexicalBlock(line: 16, column: 0, file: !47, scope: !9)
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!30 = !MDLocation(line: 4, scope: !0)
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!31 = !MDLocation(line: 4, scope: !12)
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!32 = !MDLocation(line: 7, scope: !6)
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!33 = !MDLocation(line: 7, scope: !20)
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!34 = !MDLocation(line: 10, scope: !7)
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!35 = !MDLocation(line: 10, scope: !23)
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!36 = !MDLocation(line: 13, scope: !8)
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!37 = !MDLocation(line: 13, scope: !26)
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!38 = !MDLocation(line: 16, scope: !9)
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!39 = !MDLocation(line: 16, scope: !29)
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!40 = !{!0, !6, !7, !8, !9}
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!41 = !{!13, !14, !15, !16, !17}
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!42 = !{!10, !11}
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!43 = !{!18, !19}
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!44 = !{!21, !22}
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!45 = !{!24, !25}
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!46 = !{!27, !28}
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!47 = !MDFile(filename: "foo.c", directory: "/tmp/")
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!48 = !{}
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!49 = !{i32 1, !"Debug Info Version", i32 3}
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