105 lines
5.3 KiB
LLVM
105 lines
5.3 KiB
LLVM
; REQUIRES: object-emission
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; RUN: llc -mtriple=x86_64-apple-macosx10.10.0 -o %t %s
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; Testcase generated from:
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; #include <stdint.h>
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; int foo(int a) {
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; int b = (int16_t)a + 8;
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; int c = (int16_t)b + 8;
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; int d = (int16_t)c + 8;
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; int e = (int16_t)d + 8;
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; int f = (int16_t)e + 8;
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; return f;
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; }
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; by emitting the IR and then manually applying mem2reg to it.
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; This testcase would trigger the assert commited along with it if the
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; fix of r221709 isn't applied. There is no other check except the successful
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; run of llc.
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; What happened before r221709, is that SDDbgInfo (the data structure helping
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; SelectionDAG to keep track of dbg.values) kept a map keyed by SDNode pointers.
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; This map was never purged when the SDNodes were deallocated and thus if a new
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; SDNode was allocated in the same memory, it would have an entry in the SDDbgInfo
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; map upon creation (Reallocation in the same memory can happen easily as
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; SelectionDAG uses a Recycling allocator). This behavior could turn into a
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; pathological memory consumption explosion if the DAG combiner hit the 'right'
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; allocation patterns as could be seen in PR20893.
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; By nature, this test could bitrot quite easily. If it doesn't trigger an assert
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; when run with r221709 reverted, then it really doesn't test anything anymore.
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; Function Attrs: nounwind ssp uwtable
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define i32 @foo(i32 %a) #0 !dbg !8 {
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entry:
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call void @llvm.dbg.value(metadata i32 %a, i64 0, metadata !16, metadata !17), !dbg !18
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%conv = trunc i32 %a to i16, !dbg !19
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%conv1 = sext i16 %conv to i32, !dbg !19
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%add = add nsw i32 %conv1, 8, !dbg !19
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call void @llvm.dbg.value(metadata i32 %add, i64 0, metadata !20, metadata !17), !dbg !21
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%conv2 = trunc i32 %add to i16, !dbg !22
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%conv3 = sext i16 %conv2 to i32, !dbg !22
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%add4 = add nsw i32 %conv3, 8, !dbg !22
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call void @llvm.dbg.value(metadata i32 %add4, i64 0, metadata !23, metadata !17), !dbg !24
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%conv5 = trunc i32 %add4 to i16, !dbg !25
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%conv6 = sext i16 %conv5 to i32, !dbg !25
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%add7 = add nsw i32 %conv6, 8, !dbg !25
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call void @llvm.dbg.value(metadata i32 %add7, i64 0, metadata !26, metadata !17), !dbg !27
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%conv8 = trunc i32 %add7 to i16, !dbg !28
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%conv9 = sext i16 %conv8 to i32, !dbg !28
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%add10 = add nsw i32 %conv9, 8, !dbg !28
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call void @llvm.dbg.value(metadata i32 %add10, i64 0, metadata !29, metadata !17), !dbg !30
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%conv11 = trunc i32 %add10 to i16, !dbg !31
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%conv12 = sext i16 %conv11 to i32, !dbg !31
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%add13 = add nsw i32 %conv12, 8, !dbg !31
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call void @llvm.dbg.value(metadata i32 %add13, i64 0, metadata !32, metadata !17), !dbg !33
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ret i32 %add13, !dbg !34
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
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attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!13, !14}
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!llvm.ident = !{!15}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !3, globals: !2, imports: !2)
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!1 = !DIFile(filename: "ghost-sdnode-dbgvalues.c", directory: "/tmp")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIDerivedType(tag: DW_TAG_typedef, name: "int16_t", line: 30, file: !5, baseType: !6)
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!5 = !DIFile(filename: "/usr/include/sys/_types/_int16_t.h", directory: "/tmp")
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "short", size: 16, align: 16, encoding: DW_ATE_signed)
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!8 = distinct !DISubprogram(name: "foo", line: 3, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 3, file: !1, scope: !9, type: !10, variables: !2)
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!9 = !DIFile(filename: "ghost-sdnode-dbgvalues.c", directory: "/tmp")
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!10 = !DISubroutineType(types: !11)
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!11 = !{!12, !12}
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!12 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!13 = !{i32 2, !"Dwarf Version", i32 2}
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!14 = !{i32 2, !"Debug Info Version", i32 3}
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!15 = !{!"clang version 3.6.0 "}
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!16 = !DILocalVariable(name: "a", line: 3, arg: 1, scope: !8, file: !9, type: !12)
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!17 = !DIExpression()
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!18 = !DILocation(line: 3, column: 13, scope: !8)
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!19 = !DILocation(line: 4, column: 5, scope: !8)
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!20 = !DILocalVariable(name: "b", line: 4, scope: !8, file: !9, type: !12)
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!21 = !DILocation(line: 4, column: 9, scope: !8)
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!22 = !DILocation(line: 5, column: 5, scope: !8)
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!23 = !DILocalVariable(name: "c", line: 5, scope: !8, file: !9, type: !12)
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!24 = !DILocation(line: 5, column: 9, scope: !8)
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!25 = !DILocation(line: 6, column: 5, scope: !8)
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!26 = !DILocalVariable(name: "d", line: 6, scope: !8, file: !9, type: !12)
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!27 = !DILocation(line: 6, column: 9, scope: !8)
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!28 = !DILocation(line: 7, column: 5, scope: !8)
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!29 = !DILocalVariable(name: "e", line: 7, scope: !8, file: !9, type: !12)
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!30 = !DILocation(line: 7, column: 9, scope: !8)
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!31 = !DILocation(line: 8, column: 5, scope: !8)
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!32 = !DILocalVariable(name: "f", line: 8, scope: !8, file: !9, type: !12)
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!33 = !DILocation(line: 8, column: 9, scope: !8)
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!34 = !DILocation(line: 9, column: 5, scope: !8)
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