1 ; REQUIRES: object-emission 2 3 ; RUN: llc -mtriple=x86_64-apple-macosx10.10.0 -o %t %s 4 5 ; Testcase generated from: 6 ; #include <stdint.h> 7 ; int foo(int a) { 8 ; int b = (int16_t)a + 8; 9 ; int c = (int16_t)b + 8; 10 ; int d = (int16_t)c + 8; 11 ; int e = (int16_t)d + 8; 12 ; int f = (int16_t)e + 8; 13 ; return f; 14 ; } 15 ; by emitting the IR and then manually applying mem2reg to it. 16 17 ; This testcase would trigger the assert commited along with it if the 18 ; fix of r221709 isn't applied. There is no other check except the successful 19 ; run of llc. 20 ; What happened before r221709, is that SDDbgInfo (the data structure helping 21 ; SelectionDAG to keep track of dbg.values) kept a map keyed by SDNode pointers. 22 ; This map was never purged when the SDNodes were deallocated and thus if a new 23 ; SDNode was allocated in the same memory, it would have an entry in the SDDbgInfo 24 ; map upon creation (Reallocation in the same memory can happen easily as 25 ; SelectionDAG uses a Recycling allocator). This behavior could turn into a 26 ; pathological memory consumption explosion if the DAG combiner hit the 'right' 27 ; allocation patterns as could be seen in PR20893. 28 ; By nature, this test could bitrot quite easily. If it doesn't trigger an assert 29 ; when run with r221709 reverted, then it really doesn't test anything anymore. 30 31 ; Function Attrs: nounwind ssp uwtable 32 define i32 @foo(i32 %a) #0 !dbg !8 { 33 entry: 34 call void @llvm.dbg.value(metadata i32 %a, i64 0, metadata !16, metadata !17), !dbg !18 35 %conv = trunc i32 %a to i16, !dbg !19 36 %conv1 = sext i16 %conv to i32, !dbg !19 37 %add = add nsw i32 %conv1, 8, !dbg !19 38 call void @llvm.dbg.value(metadata i32 %add, i64 0, metadata !20, metadata !17), !dbg !21 39 %conv2 = trunc i32 %add to i16, !dbg !22 40 %conv3 = sext i16 %conv2 to i32, !dbg !22 41 %add4 = add nsw i32 %conv3, 8, !dbg !22 42 call void @llvm.dbg.value(metadata i32 %add4, i64 0, metadata !23, metadata !17), !dbg !24 43 %conv5 = trunc i32 %add4 to i16, !dbg !25 44 %conv6 = sext i16 %conv5 to i32, !dbg !25 45 %add7 = add nsw i32 %conv6, 8, !dbg !25 46 call void @llvm.dbg.value(metadata i32 %add7, i64 0, metadata !26, metadata !17), !dbg !27 47 %conv8 = trunc i32 %add7 to i16, !dbg !28 48 %conv9 = sext i16 %conv8 to i32, !dbg !28 49 %add10 = add nsw i32 %conv9, 8, !dbg !28 50 call void @llvm.dbg.value(metadata i32 %add10, i64 0, metadata !29, metadata !17), !dbg !30 51 %conv11 = trunc i32 %add10 to i16, !dbg !31 52 %conv12 = sext i16 %conv11 to i32, !dbg !31 53 %add13 = add nsw i32 %conv12, 8, !dbg !31 54 call void @llvm.dbg.value(metadata i32 %add13, i64 0, metadata !32, metadata !17), !dbg !33 55 ret i32 %add13, !dbg !34 56 } 57 58 ; Function Attrs: nounwind readnone 59 declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 60 61 ; Function Attrs: nounwind readnone 62 declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1 63 64 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" } 65 attributes #1 = { nounwind readnone } 66 67 !llvm.dbg.cu = !{!0} 68 !llvm.module.flags = !{!13, !14} 69 !llvm.ident = !{!15} 70 71 !0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !7, globals: !2, imports: !2) 72 !1 = !DIFile(filename: "ghost-sdnode-dbgvalues.c", directory: "/tmp") 73 !2 = !{} 74 !3 = !{!4} 75 !4 = !DIDerivedType(tag: DW_TAG_typedef, name: "int16_t", line: 30, file: !5, baseType: !6) 76 !5 = !DIFile(filename: "/usr/include/sys/_types/_int16_t.h", directory: "/tmp") 77 !6 = !DIBasicType(tag: DW_TAG_base_type, name: "short", size: 16, align: 16, encoding: DW_ATE_signed) 78 !7 = !{!8} 79 !8 = distinct !DISubprogram(name: "foo", line: 3, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 3, file: !1, scope: !9, type: !10, variables: !2) 80 !9 = !DIFile(filename: "ghost-sdnode-dbgvalues.c", directory: "/tmp") 81 !10 = !DISubroutineType(types: !11) 82 !11 = !{!12, !12} 83 !12 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 84 !13 = !{i32 2, !"Dwarf Version", i32 2} 85 !14 = !{i32 2, !"Debug Info Version", i32 3} 86 !15 = !{!"clang version 3.6.0 "} 87 !16 = !DILocalVariable(name: "a", line: 3, arg: 1, scope: !8, file: !9, type: !12) 88 !17 = !DIExpression() 89 !18 = !DILocation(line: 3, column: 13, scope: !8) 90 !19 = !DILocation(line: 4, column: 5, scope: !8) 91 !20 = !DILocalVariable(name: "b", line: 4, scope: !8, file: !9, type: !12) 92 !21 = !DILocation(line: 4, column: 9, scope: !8) 93 !22 = !DILocation(line: 5, column: 5, scope: !8) 94 !23 = !DILocalVariable(name: "c", line: 5, scope: !8, file: !9, type: !12) 95 !24 = !DILocation(line: 5, column: 9, scope: !8) 96 !25 = !DILocation(line: 6, column: 5, scope: !8) 97 !26 = !DILocalVariable(name: "d", line: 6, scope: !8, file: !9, type: !12) 98 !27 = !DILocation(line: 6, column: 9, scope: !8) 99 !28 = !DILocation(line: 7, column: 5, scope: !8) 100 !29 = !DILocalVariable(name: "e", line: 7, scope: !8, file: !9, type: !12) 101 !30 = !DILocation(line: 7, column: 9, scope: !8) 102 !31 = !DILocation(line: 8, column: 5, scope: !8) 103 !32 = !DILocalVariable(name: "f", line: 8, scope: !8, file: !9, type: !12) 104 !33 = !DILocation(line: 8, column: 9, scope: !8) 105 !34 = !DILocation(line: 9, column: 5, scope: !8) 106
