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https://github.com/c64scene-ar/llvm-6502.git
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c9ad3ab624
The pass used to be enabled by default with CodeGenOpt::Less (-O1). This is too aggressive, considering the pass indiscriminately merges all globals together. Currently, performance doesn't always improve, and, on code that uses few globals (e.g., the odd file- or function- static), more often than not is degraded by the optimization. Lengthy discussion can be found on llvmdev (AArch64-focused; ARM has similar problems): http://lists.cs.uiuc.edu/pipermail/llvmdev/2015-February/082800.html Also, it makes tooling and debuggers less useful when dealing with globals and data sections. GlobalMerge needs to better identify those cases that benefit, and this will be done separately. In the meantime, move the pass to run with -O3 rather than -O1, on both ARM and AArch64. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233024 91177308-0d34-0410-b5e6-96231b3b80d8
123 lines
6.9 KiB
LLVM
123 lines
6.9 KiB
LLVM
; RUN: llc -O3 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
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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 04 22 )
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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-macosx10.7.0"
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@x1 = internal unnamed_addr global i32 1, align 4
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@x2 = internal unnamed_addr global i32 2, align 4
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@x3 = internal unnamed_addr global i32 3, align 4
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@x4 = internal unnamed_addr global i32 4, align 4
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@x5 = global i32 0, align 4
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define i32 @get1(i32 %a) nounwind optsize ssp {
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tail call void @llvm.dbg.value(metadata i32 %a, i64 0, metadata !10, metadata !MDExpression()), !dbg !30
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%1 = load i32, i32* @x1, align 4, !dbg !31
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tail call void @llvm.dbg.value(metadata i32 %1, i64 0, metadata !11, metadata !MDExpression()), !dbg !31
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store i32 %a, i32* @x1, align 4, !dbg !31
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ret i32 %1, !dbg !31
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}
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define i32 @get2(i32 %a) nounwind optsize ssp {
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tail call void @llvm.dbg.value(metadata i32 %a, i64 0, metadata !13, metadata !MDExpression()), !dbg !32
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%1 = load i32, i32* @x2, align 4, !dbg !33
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tail call void @llvm.dbg.value(metadata i32 %1, i64 0, metadata !14, metadata !MDExpression()), !dbg !33
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store i32 %a, i32* @x2, align 4, !dbg !33
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ret i32 %1, !dbg !33
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}
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define i32 @get3(i32 %a) nounwind optsize ssp {
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tail call void @llvm.dbg.value(metadata i32 %a, i64 0, metadata !16, metadata !MDExpression()), !dbg !34
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%1 = load i32, i32* @x3, align 4, !dbg !35
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tail call void @llvm.dbg.value(metadata i32 %1, i64 0, metadata !17, metadata !MDExpression()), !dbg !35
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store i32 %a, i32* @x3, align 4, !dbg !35
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ret i32 %1, !dbg !35
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}
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define i32 @get4(i32 %a) nounwind optsize ssp {
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tail call void @llvm.dbg.value(metadata i32 %a, i64 0, metadata !19, metadata !MDExpression()), !dbg !36
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%1 = load i32, i32* @x4, align 4, !dbg !37
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tail call void @llvm.dbg.value(metadata i32 %1, i64 0, metadata !20, metadata !MDExpression()), !dbg !37
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store i32 %a, i32* @x4, align 4, !dbg !37
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ret i32 %1, !dbg !37
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}
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define i32 @get5(i32 %a) nounwind optsize ssp {
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tail call void @llvm.dbg.value(metadata i32 %a, i64 0, metadata !27, metadata !MDExpression()), !dbg !38
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%1 = load i32, i32* @x5, align 4, !dbg !39
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tail call void @llvm.dbg.value(metadata i32 %1, i64 0, metadata !28, metadata !MDExpression()), !dbg !39
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store i32 %a, i32* @x5, align 4, !dbg !39
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ret i32 %1, !dbg !39
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}
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!49}
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!0 = !MDCompileUnit(language: DW_LANG_C99, producer: "clang", isOptimized: true, emissionKind: 1, file: !47, enums: !48, retainedTypes: !48, subprograms: !40, globals: !41, imports: !48)
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!1 = !MDSubprogram(name: "get1", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 5, file: !47, scope: !2, type: !3, function: i32 (i32)* @get1, variables: !42)
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!2 = !MDFile(filename: "ss3.c", directory: "/private/tmp")
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!3 = !MDSubroutineType(types: !4)
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!4 = !{!5}
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!5 = !MDBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!6 = !MDSubprogram(name: "get2", line: 8, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 8, file: !47, scope: !2, type: !3, function: i32 (i32)* @get2, variables: !43)
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!7 = !MDSubprogram(name: "get3", line: 11, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 11, file: !47, scope: !2, type: !3, function: i32 (i32)* @get3, variables: !44)
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!8 = !MDSubprogram(name: "get4", line: 14, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 14, file: !47, scope: !2, type: !3, function: i32 (i32)* @get4, variables: !45)
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!9 = !MDSubprogram(name: "get5", line: 17, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 17, file: !47, scope: !2, type: !3, function: i32 (i32)* @get5, variables: !46)
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!10 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "a", line: 5, arg: 1, scope: !1, file: !2, type: !5)
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!11 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "b", line: 5, scope: !12, file: !2, type: !5)
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!12 = distinct !MDLexicalBlock(line: 5, column: 19, file: !47, scope: !1)
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!13 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "a", line: 8, arg: 1, scope: !6, file: !2, type: !5)
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!14 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "b", line: 8, scope: !15, file: !2, type: !5)
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!15 = distinct !MDLexicalBlock(line: 8, column: 17, file: !47, scope: !6)
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!16 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "a", line: 11, arg: 1, scope: !7, file: !2, type: !5)
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!17 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "b", line: 11, scope: !18, file: !2, type: !5)
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!18 = distinct !MDLexicalBlock(line: 11, column: 19, file: !47, scope: !7)
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!19 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "a", line: 14, arg: 1, scope: !8, file: !2, type: !5)
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!20 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "b", line: 14, scope: !21, file: !2, type: !5)
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!21 = distinct !MDLexicalBlock(line: 14, column: 19, file: !47, scope: !8)
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!25 = !MDGlobalVariable(name: "x1", line: 4, isLocal: true, isDefinition: true, scope: !0, file: !2, type: !5, variable: i32* @x1)
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!26 = !MDGlobalVariable(name: "x2", line: 7, isLocal: true, isDefinition: true, scope: !0, file: !2, type: !5, variable: i32* @x2)
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!27 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "a", line: 17, arg: 1, scope: !9, file: !2, type: !5)
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!28 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "b", line: 17, scope: !29, file: !2, type: !5)
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!29 = distinct !MDLexicalBlock(line: 17, column: 19, file: !47, scope: !9)
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!30 = !MDLocation(line: 5, column: 16, scope: !1)
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!31 = !MDLocation(line: 5, column: 32, scope: !12)
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!32 = !MDLocation(line: 8, column: 14, scope: !6)
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!33 = !MDLocation(line: 8, column: 29, scope: !15)
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!34 = !MDLocation(line: 11, column: 16, scope: !7)
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!35 = !MDLocation(line: 11, column: 32, scope: !18)
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!36 = !MDLocation(line: 14, column: 16, scope: !8)
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!37 = !MDLocation(line: 14, column: 32, scope: !21)
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!38 = !MDLocation(line: 17, column: 16, scope: !9)
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!39 = !MDLocation(line: 17, column: 32, scope: !29)
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!40 = !{!1, !6, !7, !8, !9}
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!41 = !{!25, !26}
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!42 = !{!10, !11}
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!43 = !{!13, !14}
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!44 = !{!16, !17}
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!45 = !{!19, !20}
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!46 = !{!27, !28}
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!47 = !MDFile(filename: "ss3.c", directory: "/private/tmp")
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!48 = !{}
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!49 = !{i32 1, !"Debug Info Version", i32 3}
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