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llvm-project/llvm/test/DebugInfo/Generic/licm-hoist-debug-loc.ll

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[DWARF] Null out the debug locs of (loop invariant) instructions hoisted by LICM in order to avoid jumpy line tables. Calls are left alone because they may be inlined. Differential Revision: https://reviews.llvm.org/D28390 llvm-svn: 291258
2017-01-07 02:38:57 +08:00
; RUN: opt -S -licm %s | FileCheck %s
;
; LICM should null out debug locations when it hoists instructions out of a loop.
;
; Generated with
; clang -O0 -S -emit-llvm test.cpp -g -gline-tables-only -o t.ll
; opt -S -sroa -adce -simplifycfg -reassociate -domtree -loops \
; -loop-simplify -lcssa -basicaa -aa -scalar-evolution -loop-rotate t.ll > test.ll
;
; void bar(int *);
; void foo(int k, int p)
; {
; for (int i = 0; i < k; i++) {
; bar(&p + 4);
; }
; }
;
; We make sure that the instruction that is hoisted into the preheader
; does not have a debug location.
; CHECK: for.body.lr.ph:
; CHECK: getelementptr{{.*}}%p.addr, i64 4{{$}}
; CHECK: for.body:
;
; ModuleID = 't.ll'
source_filename = "test.c"
; Function Attrs: nounwind sspstrong uwtable
define void @foo(i32 %k, i32 %p) !dbg !7 {
entry:
%p.addr = alloca i32, align 4
store i32 %p, i32* %p.addr, align 4
%cmp2 = icmp slt i32 0, %k, !dbg !9
br i1 %cmp2, label %for.body.lr.ph, label %for.end, !dbg !9
for.body.lr.ph: ; preds = %entry
br label %for.body, !dbg !9
for.body: ; preds = %for.body.lr.ph, %for.body
%i.03 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%add.ptr = getelementptr inbounds i32, i32* %p.addr, i64 4, !dbg !11
call void @bar(i32* %add.ptr), !dbg !11
%inc = add nsw i32 %i.03, 1, !dbg !12
%cmp = icmp slt i32 %inc, %k, !dbg !9
br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge, !dbg !9, !llvm.loop !14
for.cond.for.end_crit_edge: ; preds = %for.body
br label %for.end, !dbg !9
for.end: ; preds = %for.cond.for.end_crit_edge, %entry
ret void, !dbg !16
}
declare void @bar(i32*)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.1 (PS4 clang version 4.50.0.249 7e7cd823 checking)", isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2)
!1 = !DIFile(filename: "test.c", directory: "D:\test")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"PIC Level", i32 2}
!6 = !{!"clang version 3.9.1 (PS4 clang version 4.50.0.249 7e7cd823 checking)"}
[DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. In order to set breakpoints on labels and list source code around labels, we need collect debug information for labels, i.e., label name, the function label belong, line number in the file, and the address label located. In order to keep these information in LLVM IR and to allow backend to generate debug information correctly. We create a new kind of metadata for labels, DILabel. The format of DILabel is !DILabel(scope: !1, name: "foo", file: !2, line: 3) We hope to keep debug information as much as possible even the code is optimized. So, we create a new kind of intrinsic for label metadata to avoid the metadata is eliminated with basic block. The intrinsic will keep existing if we keep it from optimized out. The format of the intrinsic is llvm.dbg.label(metadata !1) It has only one argument, that is the DILabel metadata. The intrinsic will follow the label immediately. Backend could get the label metadata through the intrinsic's parameter. We also create DIBuilder API for labels to be used by Frontend. Frontend could use createLabel() to allocate DILabel objects, and use insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR. Differential Revision: https://reviews.llvm.org/D45024 Patch by Hsiangkai Wang. llvm-svn: 331841
2018-05-09 10:40:45 +08:00
!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
[DWARF] Null out the debug locs of (loop invariant) instructions hoisted by LICM in order to avoid jumpy line tables. Calls are left alone because they may be inlined. Differential Revision: https://reviews.llvm.org/D28390 llvm-svn: 291258
2017-01-07 02:38:57 +08:00
!8 = !DISubroutineType(types: !2)
!9 = !DILocation(line: 4, scope: !10)
!10 = !DILexicalBlockFile(scope: !7, file: !1, discriminator: 1)
!11 = !DILocation(line: 5, scope: !7)
!12 = !DILocation(line: 4, scope: !13)
!13 = !DILexicalBlockFile(scope: !7, file: !1, discriminator: 2)
!14 = distinct !{!14, !15}
!15 = !DILocation(line: 4, scope: !7)
!16 = !DILocation(line: 7, scope: !7)