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clang-p2996/llvm/test/DebugInfo/Generic/assignment-tracking/licm/multi-exit.ll
OCHyams 2da67e8053 [Assignment Tracking][18/*] Account for assignment tracking in LICM 
The Assignment Tracking debug-info feature is outlined in this RFC:

https://discourse.llvm.org/t/
rfc-assignment-tracking-a-better-way-of-specifying-variable-locations-in-ir

Merge DIAssignID attachments on stores that are merged and sunk out of
loops. The store may be sunk into multiple exit blocks, and in this case all
the copies of the store get the same DIAssignID.

Reviewed By: jmorse

Differential Revision: https://reviews.llvm.org/D133313
2022-11-15 12:24:16 +00:00

181 lines
8.4 KiB
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; RUN: opt %s -S -licm -o - -experimental-assignment-tracking | 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: call void @llvm.dbg.assign(metadata i32 1, metadata ![[var:[0-9]+]], metadata !DIExpression(), metadata ![[id:[0-9]+]], metadata ptr %a, metadata !DIExpression()), !dbg
; 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.p0i8(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.p0i8(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}
!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}
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