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