4796b4ae7b
Currently global SRA uses the GEP structure to determine how to split the global. This patch instead analyses the loads and stores that are performed on the global, and collects which types are used at which offset, and then splits the global according to those. This is both more general, and works fine with opaque pointers. This is also closer to how ordinary SROA is performed. Differential Revision: https://reviews.llvm.org/D117223
128 lines
6.3 KiB
LLVM
128 lines
6.3 KiB
LLVM
; RUN: opt -S -globalopt < %s | FileCheck %s
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source_filename = "test.c"
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.12.0"
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%struct.mystruct = type { i32, i64 }
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; Generated at -Os from:
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;
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; static struct { int a; char b; } array[2];
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; void __attribute__((nodebug)) foo(int in) { array[0].a = in; }
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; void __attribute__((nodebug)) bar(int in) { array[1].a = in; }
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; int main(int argc, char **argv)
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; {
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; foo(argv[0][1]);
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; bar(argv[0][1]);
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; return array[0].a + array[1].a;
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; }
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%struct.anon = type { i32, i8 }
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; This array is first split into two struct, which are then split into their
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; elements, of which only .a survives.
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@array = internal global [2 x %struct.anon] zeroinitializer, align 16, !dbg !0
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; CHECK: @array.0 = internal unnamed_addr global i32 0, align 16, !dbg ![[EL0:.*]]
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; CHECK: @array.1 = internal unnamed_addr global i32 0, align 8, !dbg ![[EL1:.*]]
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; CHECK: ![[EL0]] = !DIGlobalVariableExpression(var: ![[VAR:.*]], expr: !DIExpression(DW_OP_LLVM_fragment, 0, 32))
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; CHECK: ![[VAR]] = distinct !DIGlobalVariable(name: "array"
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; CHECK: ![[EL1]] = !DIGlobalVariableExpression(var: ![[VAR]], expr: !DIExpression(DW_OP_LLVM_fragment, 64, 32))
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; Function Attrs: nounwind optsize ssp uwtable
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define void @foo(i32 %in) #0 {
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entry:
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store i32 %in, i32* getelementptr inbounds ([2 x %struct.anon], [2 x %struct.anon]* @array, i64 0, i64 0, i32 0), align 16, !tbaa !20
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ret void
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}
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; Function Attrs: nounwind optsize ssp uwtable
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define void @bar(i32 %in) #0 {
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entry:
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store i32 %in, i32* getelementptr inbounds ([2 x %struct.anon], [2 x %struct.anon]* @array, i64 0, i64 1, i32 0), align 8, !tbaa !20
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ret void
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}
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; Function Attrs: nounwind optsize ssp uwtable
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define i32 @main(i32 %argc, i8** %argv) #0 !dbg !25 {
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entry:
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call void @llvm.dbg.value(metadata i32 %argc, metadata !31, metadata !33), !dbg !34
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call void @llvm.dbg.value(metadata i8** %argv, metadata !32, metadata !33), !dbg !35
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%0 = load i8*, i8** %argv, align 8, !dbg !36, !tbaa !37
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%arrayidx1 = getelementptr inbounds i8, i8* %0, i64 1, !dbg !36
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%1 = load i8, i8* %arrayidx1, align 1, !dbg !36, !tbaa !39
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%conv = sext i8 %1 to i32, !dbg !36
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call void @foo(i32 %conv) #2, !dbg !40
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%2 = load i8*, i8** %argv, align 8, !dbg !41, !tbaa !37
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%arrayidx3 = getelementptr inbounds i8, i8* %2, i64 1, !dbg !41
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%3 = load i8, i8* %arrayidx3, align 1, !dbg !41, !tbaa !39
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%conv4 = sext i8 %3 to i32, !dbg !41
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call void @bar(i32 %conv4) #2, !dbg !42
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%4 = load i32, i32* getelementptr inbounds ([2 x %struct.anon], [2 x %struct.anon]* @array, i64 0, i64 0, i32 0), align 16, !dbg !43, !tbaa !20
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%5 = load i32, i32* getelementptr inbounds ([2 x %struct.anon], [2 x %struct.anon]* @array, i64 0, i64 1, i32 0), align 8, !dbg !44, !tbaa !20
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%add = add nsw i32 %4, %5, !dbg !45
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ret i32 %add, !dbg !46
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { nounwind optsize ssp uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="penryn" "target-features"="+cx16,+fxsr,+mmx,+sse,+sse2,+sse3,+sse4.1,+ssse3,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone speculatable }
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attributes #2 = { optsize }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!15, !16, !17, !18}
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!llvm.ident = !{!19}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "array", scope: !2, file: !3, line: 1, type: !6, isLocal: true, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 6.0.0 (trunk 309960) (llvm/trunk 309961)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
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!3 = !DIFile(filename: "test.c", directory: "/")
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!4 = !{}
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!5 = !{!0}
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!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 128, elements: !13)
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!7 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !3, line: 1, size: 64, elements: !8)
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!8 = !{!9, !11}
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!9 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !7, file: !3, line: 1, baseType: !10, size: 32)
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !7, file: !3, line: 1, baseType: !12, size: 8, offset: 32)
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!12 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
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!13 = !{!14}
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!14 = !DISubrange(count: 2)
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!15 = !{i32 2, !"Dwarf Version", i32 4}
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!16 = !{i32 2, !"Debug Info Version", i32 3}
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!17 = !{i32 1, !"wchar_size", i32 4}
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!18 = !{i32 7, !"PIC Level", i32 2}
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!19 = !{!"clang version 6.0.0 (trunk 309960) (llvm/trunk 309961)"}
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!20 = !{!21, !22, i64 0}
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!21 = !{!"", !22, i64 0, !23, i64 4}
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!22 = !{!"int", !23, i64 0}
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!23 = !{!"omnipotent char", !24, i64 0}
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!24 = !{!"Simple C/C++ TBAA"}
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!25 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 4, type: !26, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !30)
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!26 = !DISubroutineType(types: !27)
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!27 = !{!10, !10, !28}
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!28 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !29, size: 64)
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!29 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
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!30 = !{!31, !32}
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!31 = !DILocalVariable(name: "argc", arg: 1, scope: !25, file: !3, line: 4, type: !10)
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!32 = !DILocalVariable(name: "argv", arg: 2, scope: !25, file: !3, line: 4, type: !28)
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!33 = !DIExpression()
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!34 = !DILocation(line: 4, column: 14, scope: !25)
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!35 = !DILocation(line: 4, column: 27, scope: !25)
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!36 = !DILocation(line: 6, column: 7, scope: !25)
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!37 = !{!38, !38, i64 0}
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!38 = !{!"any pointer", !23, i64 0}
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!39 = !{!23, !23, i64 0}
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!40 = !DILocation(line: 6, column: 3, scope: !25)
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!41 = !DILocation(line: 7, column: 7, scope: !25)
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!42 = !DILocation(line: 7, column: 3, scope: !25)
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!43 = !DILocation(line: 8, column: 19, scope: !25)
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!44 = !DILocation(line: 8, column: 32, scope: !25)
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!45 = !DILocation(line: 8, column: 21, scope: !25)
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!46 = !DILocation(line: 8, column: 3, scope: !25)
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