b9f1e7b16e
Incorrect Debug Variable Range was calculated while "COMPUTING LIVE DEBUG VARIABLES" stage.
Range for Debug Variable("i") computed according to current state of instructions
inside of basic block. But Register Allocator creates new instructions which were not taken
into account when Live Debug Variables computed. In the result DBG_VALUE instruction for
the "i" variable was put after these newly inserted instructions. This is incorrect.
Debug Value for the loop counter should be inserted before any loop instruction.
Differential Revision: https://reviews.llvm.org/D62650
llvm-svn: 362750
82 lines
3.8 KiB
LLVM
82 lines
3.8 KiB
LLVM
; RUN: llc -mtriple=x86_64-linux-gnu -filetype=obj -o - %s | llvm-dwarfdump -debug-loc - | FileCheck %s
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; The test inlines the function F four times, with each inlined variable for
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; "i4" sharing the same virtual register. This means the live interval of the
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; register spans all of the inlined callsites, extending beyond the lexical
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; scope of each. Later during register allocation the live interval is split
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; into multiple intervals. Check that this does not generate multiple entries
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; within the debug location (see PR33730).
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;
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; Generated from:
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;
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; extern int foobar(int, int, int, int, int);
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;
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; int F(int i1, int i2, int i3, int i4, int i5) {
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; return foobar(i1, i2, i3, i4, i5);
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; }
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;
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; int foo(int a, int b, int c, int d, int e) {
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; return F(a,b,c,d,e) +
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; F(a,b,c,d,e) +
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; F(a,b,c,d,e) +
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; F(a,b,c,d,e);
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; }
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; CHECK: .debug_loc contents:
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; CHECK-NEXT: 0x00000000:
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; We currently emit an entry for the function prologue, too, which could be optimized away.
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; CHECK: [0x0000000000000010, 0x0000000000000072): DW_OP_reg3 RBX
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; We should only have one entry inside the function.
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; CHECK-NOT: :
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declare i32 @foobar(i32, i32, i32, i32, i32)
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define i32 @foo(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) !dbg !25 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 %d, i64 0, metadata !15, metadata !17) #3, !dbg !41
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%call.i = tail call i32 @foobar(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) #3, !dbg !43
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%call.i21 = tail call i32 @foobar(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) #3, !dbg !50
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%add = add nsw i32 %call.i21, %call.i, !dbg !51
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%call.i22 = tail call i32 @foobar(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) #3, !dbg !58
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%add3 = add nsw i32 %add, %call.i22, !dbg !59
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%call.i23 = tail call i32 @foobar(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) #3, !dbg !66
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%add5 = add nsw i32 %add3, %call.i23, !dbg !67
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ret i32 %add5, !dbg !68
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}
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 (trunk 308976)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "foo.c", directory: "")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 6.0.0 (trunk 308976)"}
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!7 = distinct !DISubprogram(name: "F", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !10, !10, !10, !10, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!15}
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!15 = !DILocalVariable(name: "i4", arg: 4, scope: !7, file: !1, line: 3, type: !10)
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!17 = !DIExpression()
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!25 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 7, type: !8, isLocal: false, isDefinition: true, scopeLine: 7, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !26)
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!26 = !{}
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!38 = distinct !DILocation(line: 8, column: 10, scope: !25)
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!41 = !DILocation(line: 3, column: 35, scope: !7, inlinedAt: !38)
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!43 = !DILocation(line: 4, column: 10, scope: !7, inlinedAt: !38)
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!45 = distinct !DILocation(line: 9, column: 10, scope: !25)
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!50 = !DILocation(line: 4, column: 10, scope: !7, inlinedAt: !45)
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!51 = !DILocation(line: 8, column: 23, scope: !25)
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!53 = distinct !DILocation(line: 10, column: 10, scope: !25)
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!58 = !DILocation(line: 4, column: 10, scope: !7, inlinedAt: !53)
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!59 = !DILocation(line: 9, column: 23, scope: !25)
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!61 = distinct !DILocation(line: 11, column: 10, scope: !25)
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!66 = !DILocation(line: 4, column: 10, scope: !7, inlinedAt: !61)
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!67 = !DILocation(line: 10, column: 23, scope: !25)
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!68 = !DILocation(line: 8, column: 3, scope: !25)
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