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clang-p2996/llvm/test/Transforms/InstCombine/debuginfo-dce.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 -passes=instcombine %s -S -o - | FileCheck %s
; RUN: opt -passes=instcombine %s -S -o - --try-experimental-debuginfo-iterators | FileCheck %s
; Verify that the eliminated instructions (bitcast, gep, load) are salvaged into
; a DIExpression.
;
; Originally created from the following C source and then heavily isolated/reduced.
;
; struct entry {
; struct entry *next;
; };
; void scan(struct entry *queue, struct entry *end)
; {
; struct entry *entry;
; for (entry = (struct entry *)((char *)(queue->next) - 8);
; &entry->next == end;
; entry = (struct entry *)((char *)(entry->next) - 8)) {
; }
; }
; ModuleID = '<stdin>'
source_filename = "test.c"
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.12.0"
%struct.entry = type { ptr }
; This salvage can't currently occur safely (PR40628), however if/when that's
; ever fixed, then this is definitely a piece of test coverage that should
; be maintained.
define void @salvage_load(ptr %queue) local_unnamed_addr #0 !dbg !14 {
entry:
%im_not_dead = alloca ptr
%0 = load ptr, ptr %queue, align 8, !dbg !19
%1 = load ptr, ptr %queue, align 8, !dbg !19
call void @llvm.dbg.value(metadata ptr %1, metadata !18, metadata !20), !dbg !19
; CHECK: define void @salvage_load
; CHECK-NEXT: entry:
; CHECK-NEXT: #dbg_value(ptr poison
store ptr %1, ptr %im_not_dead, align 8
ret void, !dbg !21
}
define void @salvage_bitcast(ptr %queue) local_unnamed_addr #0 !dbg !22 {
entry:
%im_not_dead = alloca ptr
call void @llvm.dbg.value(metadata ptr %queue, metadata !24, metadata !20), !dbg !23
; CHECK: define void @salvage_bitcast
; CHECK-NEXT: entry:
; CHECK-NEXT: #dbg_value(ptr %queue,
; CHECK-SAME: !DIExpression(DW_OP_plus_uconst, 0),
store ptr %queue, ptr %im_not_dead, align 8
ret void, !dbg !23
}
define void @salvage_gep0(ptr %queue, ptr %end) local_unnamed_addr #0 !dbg !25 {
entry:
%im_not_dead = alloca ptr
%0 = getelementptr inbounds %struct.entry, ptr %queue, i32 -1, i32 0, !dbg !26
%1 = getelementptr inbounds %struct.entry, ptr %queue, i32 -1, i32 0, !dbg !26
call void @llvm.dbg.value(metadata ptr %1, metadata !27, metadata !20), !dbg !26
; CHECK: define void @salvage_gep0
; CHECK-NEXT: entry:
; CHECK-NEXT: #dbg_value(ptr %queue,
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_stack_value),
store ptr %1, ptr %im_not_dead, align 8
ret void, !dbg !26
}
define void @salvage_gep1(ptr %queue, ptr %end) local_unnamed_addr #0 !dbg !28 {
entry:
%im_not_dead = alloca ptr
%0 = getelementptr inbounds %struct.entry, ptr %queue, i32 -1, i32 0, !dbg !29
%1 = getelementptr inbounds %struct.entry, ptr %queue, i32 -1, i32 0, !dbg !29
call void @llvm.dbg.value(metadata ptr %1, metadata !30, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32)), !dbg !29
; CHECK: define void @salvage_gep1
; CHECK-NEXT: entry:
; CHECK-NEXT: #dbg_value(ptr %queue,
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_stack_value, DW_OP_LLVM_fragment, 0, 32),
store ptr %1, ptr %im_not_dead, align 8
ret void, !dbg !29
}
define void @salvage_gep2(ptr %queue, ptr %end) local_unnamed_addr #0 !dbg !31 {
entry:
%im_not_dead = alloca ptr
%0 = getelementptr inbounds %struct.entry, ptr %queue, i32 -1, i32 0, !dbg !32
%1 = getelementptr inbounds %struct.entry, ptr %queue, i32 -1, i32 0, !dbg !32
call void @llvm.dbg.value(metadata ptr %1, metadata !33, metadata !DIExpression(DW_OP_stack_value)), !dbg !32
; CHECK: define void @salvage_gep2
; CHECK-NEXT: entry:
; CHECK-NEXT: #dbg_value(ptr %queue,
; CHECK-SAME: !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_stack_value),
store ptr %1, ptr %im_not_dead, align 8
ret void, !dbg !32
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
attributes #0 = { nounwind ssp uwtable }
attributes #1 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!10, !11, !12}
!llvm.ident = !{!13}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 5.0.0 (trunk 297628) (llvm/trunk 297643)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3)
!1 = !DIFile(filename: "test.c", directory: "/")
!2 = !{}
!3 = !{!4, !8}
!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64)
!5 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "entry", file: !1, line: 1, size: 64, elements: !6)
!6 = !{!7}
!7 = !DIDerivedType(tag: DW_TAG_member, name: "next", scope: !5, file: !1, line: 2, baseType: !4, size: 64)
!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64)
!9 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!10 = !{i32 2, !"Dwarf Version", i32 4}
!11 = !{i32 2, !"Debug Info Version", i32 3}
!12 = !{i32 1, !"PIC Level", i32 2}
!13 = !{!"clang version 5.0.0 (trunk 297628) (llvm/trunk 297643)"}
!14 = distinct !DISubprogram(name: "scan", scope: !1, file: !1, line: 4, type: !15, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !17)
!15 = !DISubroutineType(types: !16)
!16 = !{null, !4, !4}
!17 = !{!18}
!18 = !DILocalVariable(name: "entry", scope: !14, file: !1, line: 6, type: !4)
!19 = !DILocation(line: 6, column: 17, scope: !14)
!20 = !DIExpression(DW_OP_plus_uconst, 0)
!21 = !DILocation(line: 11, column: 1, scope: !14)
!22 = distinct !DISubprogram(name: "scan", scope: !1, file: !1, line: 4, type: !15, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !17)
!23 = !DILocation(line: 6, column: 17, scope: !22)
!24 = !DILocalVariable(name: "entry", scope: !22, file: !1, line: 6, type: !4)
!25 = distinct !DISubprogram(name: "scan", scope: !1, file: !1, line: 4, type: !15, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !17)
!26 = !DILocation(line: 6, column: 17, scope: !25)
!27 = !DILocalVariable(name: "entry", scope: !25, file: !1, line: 6, type: !4)
!28 = distinct !DISubprogram(name: "scan", scope: !1, file: !1, line: 4, type: !15, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !17)
!29 = !DILocation(line: 6, column: 17, scope: !28)
!30 = !DILocalVariable(name: "entry", scope: !28, file: !1, line: 6, type: !4)
!31 = distinct !DISubprogram(name: "scan", scope: !1, file: !1, line: 4, type: !15, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !17)
!32 = !DILocation(line: 6, column: 17, scope: !31)
!33 = !DILocalVariable(name: "entry", scope: !31, file: !1, line: 6, type: !4)
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