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clang-p2996/llvm/test/DebugInfo/Generic/assignment-tracking/licm/multi-exit.ll
Stephen Tozer 094572701d [RemoveDIs] Print IR with debug records by default (#91724) 
This patch makes the final major change of the RemoveDIs project, changing the
default IR output from debug intrinsics to debug records. This is expected to
break a large number of tests: every single one that tests for uses or
declarations of debug intrinsics and does not explicitly disable writing
records. 

If this patch has broken your downstream tests (or upstream tests on a
configuration I wasn't able to run):
1. If you need to immediately unblock a build, pass
`--write-experimental-debuginfo=false` to LLVM's option processing for all
failing tests (remember to use `-mllvm` for clang/flang to forward arguments to
LLVM).
2. For most test failures, the changes are trivial and mechanical, enough that
they can be done by script; see the migration guide for a guide on how to do
this: https://llvm.org/docs/RemoveDIsDebugInfo.html#test-updates
3. If any tests fail for reasons other than FileCheck check lines that need
updating, such as assertion failures, that is most likely a real bug with this
patch and should be reported as such.

For more information, see the recent PSA:
https://discourse.llvm.org/t/psa-ir-output-changing-from-debug-intrinsics-to-debug-records/79578
2024-06-14 15:07:27 +01:00

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; RUN: opt %s -S -passes=licm -o - | FileCheck %s
; RUN: opt --try-experimental-debuginfo-iterators %s -S -passes=licm -o - | FileCheck %s
;; $ cat test.c
;; int b, c, d;
;; void e();
;; void f(int *g) { *g = b; }
;; void i() {
;; int h, a;
;; for (;;) {
;; e();
;; a = 1;
;; if (h) {
;; if (d)
;; continue;
;; h = c;
;; }
;; f(&a);
;; }
;; }
;; Generated by getting the IR before LICM in:
;; $ clang -c -O2 -g test.c -fno-unroll-loops -fno-vectorize -fno-inline -Xclang -fexperimental-assignment-tracking -o -
;; entry
;; |
;; v
;; *---->for.cond.outer
;; | |
;; | v
;; | +->for.cond-----+
;; | | | |
;; | | v |
;; | +--if.then |
;; | | |
;; | v v
;; | if.end if.end3.loopexit
;; | | |
;; | v |
;; +-----if.end3 <----+
;;
;; The store in for.cond is sunk into the inner-loop exits if.end and if.end3.loopexit.
;;
;; Check that a store sunk into multiple exits retains its (their) dbg.assign,
;; and that the new stores share the same DIAssignID.
; CHECK-LABEL: for.cond:
; CHECK: #dbg_assign(i32 1, ![[var:[0-9]+]], !DIExpression(), ![[id:[0-9]+]], ptr %a, !DIExpression(),
; CHECK-LABEL: if.end:
; CHECK-NEXT: store i32 1, ptr %a, align 1,{{.*}}!DIAssignID ![[id]]
; CHECK-LABEL: if.end3.loopexit:
; CHECK-NEXT: store i32 1, ptr %a, align 1,{{.*}}!DIAssignID ![[id]]
; CHECK-DAG: ![[var]] = !DILocalVariable(name: "a",
@b = dso_local local_unnamed_addr global i32 0, align 4, !dbg !0
@d = dso_local local_unnamed_addr global i32 0, align 4, !dbg !9
@c = dso_local local_unnamed_addr global i32 0, align 4, !dbg !6
define dso_local void @f(ptr nocapture %g) local_unnamed_addr #0 !dbg !15 {
entry:
call void @llvm.dbg.assign(metadata i1 undef, metadata !20, metadata !DIExpression(), metadata !21, metadata ptr undef, metadata !DIExpression()), !dbg !22
call void @llvm.dbg.assign(metadata ptr %g, metadata !20, metadata !DIExpression(), metadata !23, metadata ptr undef, metadata !DIExpression()), !dbg !22
%0 = load i32, ptr @b, align 4, !dbg !24
store i32 %0, ptr %g, align 4, !dbg !29
ret void, !dbg !30
}
define dso_local void @i() local_unnamed_addr #2 !dbg !31 {
entry:
call void @llvm.dbg.assign(metadata i1 undef, metadata !35, metadata !DIExpression(), metadata !37, metadata ptr undef, metadata !DIExpression()), !dbg !38
%a = alloca i32, align 4, !DIAssignID !39
call void @llvm.dbg.assign(metadata i1 undef, metadata !36, metadata !DIExpression(), metadata !39, metadata ptr %a, metadata !DIExpression()), !dbg !38
call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %a) #5, !dbg !40
br label %for.cond.outer, !dbg !41
for.cond.outer: ; preds = %if.end3, %entry
%h.0.ph = phi i32 [ %h.1, %if.end3 ], [ undef, %entry ]
br label %for.cond, !dbg !42
for.cond: ; preds = %for.cond.outer, %if.then
call void @llvm.dbg.value(metadata i32 %h.0.ph, metadata !35, metadata !DIExpression()), !dbg !38
tail call void (...) @e() #5, !dbg !44
store i32 1, ptr %a, align 4, !dbg !47, !DIAssignID !48
call void @llvm.dbg.assign(metadata i32 1, metadata !36, metadata !DIExpression(), metadata !48, metadata ptr %a, metadata !DIExpression()), !dbg !38
%tobool.not = icmp eq i32 %h.0.ph, 0, !dbg !49
br i1 %tobool.not, label %if.end3.loopexit, label %if.then, !dbg !51
if.then: ; preds = %for.cond
%0 = load i32, ptr @d, align 4, !dbg !52
%tobool1.not = icmp eq i32 %0, 0, !dbg !52
br i1 %tobool1.not, label %if.end, label %for.cond, !dbg !55, !llvm.loop !56
if.end: ; preds = %if.then
%1 = load i32, ptr @c, align 4, !dbg !59
call void @llvm.dbg.assign(metadata i32 %1, metadata !35, metadata !DIExpression(), metadata !60, metadata ptr undef, metadata !DIExpression()), !dbg !38
br label %if.end3, !dbg !61
if.end3.loopexit: ; preds = %for.cond
br label %if.end3, !dbg !62
if.end3: ; preds = %if.end3.loopexit, %if.end
%h.1 = phi i32 [ %1, %if.end ], [ 0, %if.end3.loopexit ]
call void @llvm.dbg.value(metadata i32 %h.1, metadata !35, metadata !DIExpression()), !dbg !38
call void @f(ptr nonnull %a), !dbg !62
br label %for.cond.outer, !dbg !63, !llvm.loop !56
}
declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #1
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #3
declare !dbg !64 dso_local void @e(...) local_unnamed_addr #4
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!11, !12, !13, !1000}
!llvm.ident = !{!14}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "b", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
!3 = !DIFile(filename: "test.c", directory: "/")
!4 = !{}
!5 = !{!0, !6, !9}
!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
!7 = distinct !DIGlobalVariable(name: "c", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!9 = !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
!10 = distinct !DIGlobalVariable(name: "d", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
!11 = !{i32 7, !"Dwarf Version", i32 4}
!12 = !{i32 2, !"Debug Info Version", i32 3}
!13 = !{i32 1, !"wchar_size", i32 4}
!14 = !{!"clang version 12.0.0"}
!15 = distinct !DISubprogram(name: "f", scope: !3, file: !3, line: 3, type: !16, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !19)
!16 = !DISubroutineType(types: !17)
!17 = !{null, !18}
!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64)
!19 = !{!20}
!20 = !DILocalVariable(name: "g", arg: 1, scope: !15, file: !3, line: 3, type: !18)
!21 = distinct !DIAssignID()
!22 = !DILocation(line: 0, scope: !15)
!23 = distinct !DIAssignID()
!24 = !DILocation(line: 3, column: 23, scope: !15)
!29 = !DILocation(line: 3, column: 21, scope: !15)
!30 = !DILocation(line: 3, column: 26, scope: !15)
!31 = distinct !DISubprogram(name: "i", scope: !3, file: !3, line: 4, type: !32, scopeLine: 4, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !34)
!32 = !DISubroutineType(types: !33)
!33 = !{null}
!34 = !{!35, !36}
!35 = !DILocalVariable(name: "h", scope: !31, file: !3, line: 5, type: !8)
!36 = !DILocalVariable(name: "a", scope: !31, file: !3, line: 5, type: !8)
!37 = distinct !DIAssignID()
!38 = !DILocation(line: 0, scope: !31)
!39 = distinct !DIAssignID()
!40 = !DILocation(line: 5, column: 3, scope: !31)
!41 = !DILocation(line: 6, column: 3, scope: !31)
!42 = !DILocation(line: 6, column: 3, scope: !43)
!43 = distinct !DILexicalBlock(scope: !31, file: !3, line: 6, column: 3)
!44 = !DILocation(line: 7, column: 5, scope: !45)
!45 = distinct !DILexicalBlock(scope: !46, file: !3, line: 6, column: 12)
!46 = distinct !DILexicalBlock(scope: !43, file: !3, line: 6, column: 3)
!47 = !DILocation(line: 8, column: 7, scope: !45)
!48 = distinct !DIAssignID()
!49 = !DILocation(line: 9, column: 9, scope: !50)
!50 = distinct !DILexicalBlock(scope: !45, file: !3, line: 9, column: 9)
!51 = !DILocation(line: 9, column: 9, scope: !45)
!52 = !DILocation(line: 10, column: 11, scope: !53)
!53 = distinct !DILexicalBlock(scope: !54, file: !3, line: 10, column: 11)
!54 = distinct !DILexicalBlock(scope: !50, file: !3, line: 9, column: 12)
!55 = !DILocation(line: 10, column: 11, scope: !54)
!56 = distinct !{!56, !42, !57, !58}
!57 = !DILocation(line: 15, column: 3, scope: !43)
!58 = !{!"llvm.loop.unroll.disable"}
!59 = !DILocation(line: 12, column: 11, scope: !54)
!60 = distinct !DIAssignID()
!61 = !DILocation(line: 13, column: 5, scope: !54)
!62 = !DILocation(line: 14, column: 5, scope: !45)
!63 = !DILocation(line: 6, column: 3, scope: !46)
!64 = !DISubprogram(name: "e", scope: !3, file: !3, line: 2, type: !65, spFlags: DISPFlagOptimized, retainedNodes: !4)
!65 = !DISubroutineType(types: !66)
!66 = !{null, null}
!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
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