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llvm-project/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/store.ll
OCHyams 5d17ae2d5d [Assignment Tracking] Downgrade dbg.assigns to dbg.values in mem2reg 
For fully promoted variables dbg.assigns and dbg.values convey the same
information and can be used interchangeably. This patch converts dbg.assigns to
dbg.values for variables promoted by mem2reg. This reduces resource usage by
reducing the amount of unnecessary function local metadata. The compile time
tracker reports that CTMark projects build with LTO-O3-g with 0.4% fewer
instructions retired and peak memory usage is reduced by 2.2%.

Reviewed By: jryans

Differential Revision: https://reviews.llvm.org/D145511
2023-03-21 09:50:36 +00:00

139 lines
8.2 KiB
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; RUN: opt -passes=sroa,verify -S %s -o - \
; RUN: | FileCheck %s --implicit-check-not="call void @llvm.dbg"
; Check that the new slices of an alloca and memset intructions get dbg.assign
; intrinsics with the correct fragment info. Ensure that only the
; value-expression gets fragment info; that the address-expression remains
; untouched.
;; $ cat test.cpp
;; void do_something();
;; struct LargeStruct {
;; int A, B, C;
;; int Var;
;; int D, E, F;
;; };
;; int Glob;
;; bool Cond;
;; int use(LargeStruct);
;; int example() {
;; LargeStruct S = {0};
;; S.Var = Glob;
;; use(S);
;; return S.Var;
;; }
;; $ clang test.cpp -Xclang -disable-llvm-passes -O2 -g -c -S -emit-llvm -o - \
;; | opt -passes=declare-to-assign -S -o -
; CHECK: entry:
; CHECK-NEXT: %S.sroa.0 = alloca { i32, i32, i32 }, align 8, !DIAssignID ![[ID_1:[0-9]+]]
; CHECK-NEXT: call void @llvm.dbg.assign(metadata i1 undef, metadata ![[VAR:[0-9]+]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 96), metadata ![[ID_1]], metadata ptr %S.sroa.0, metadata !DIExpression()), !dbg
; CHECK-NEXT: %S.sroa.4 = alloca { i32, i32, i32 }, align 8, !DIAssignID ![[ID_3:[0-9]+]]
; CHECK-NEXT: call void @llvm.dbg.assign(metadata i1 undef, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 128, 96), metadata ![[ID_3]], metadata ptr %S.sroa.4, metadata !DIExpression()), !dbg
;; The memset has been split into [0, 96)[96, 128)[128, 224) bit slices. The
;; memset for the middle slice has been removed.
; CHECK: call void @llvm.memset{{.*}}(ptr align 8 %S.sroa.0, i8 0, i64 12, i1 false), !dbg !{{.+}}, !DIAssignID ![[ID_4:[0-9]+]]
; CHECK-NEXT: call void @llvm.memset{{.*}}(ptr align 8 %S.sroa.4, i8 0, i64 12, i1 false), !dbg !{{.+}}, !DIAssignID ![[ID_5:[0-9]+]]
; CHECK-NEXT: call void @llvm.dbg.assign(metadata i8 0, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 0, 96), metadata ![[ID_4]], metadata ptr %S.sroa.0, metadata !DIExpression()), !dbg
;; This is the one we care about most in this test: check that a memset->store
;; gets a correct dbg.assign.
; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 0, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 96, 32))
; CHECK-NEXT: call void @llvm.dbg.assign(metadata i8 0, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 128, 96), metadata ![[ID_5]], metadata ptr %S.sroa.4, metadata !DIExpression()), !dbg
;; The load from global+store becomes a load.
;; FIXME: In reality it is actually stored again later on.
; CHECK-NEXT: %0 = load i32, ptr @Glob, align 4, !dbg !{{.+}}
; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 %0, metadata ![[VAR]], metadata !DIExpression(DW_OP_LLVM_fragment, 96, 32))
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
%struct.LargeStruct = type { i32, i32, i32, i32, i32, i32, i32 }
@Glob = dso_local global i32 0, align 4, !dbg !0
@Cond = dso_local global i8 0, align 1, !dbg !6
; Function Attrs: uwtable mustprogress
define dso_local i32 @_Z7examplev() #0 !dbg !14 {
entry:
%S = alloca %struct.LargeStruct, align 4, !DIAssignID !28
call void @llvm.dbg.assign(metadata i1 undef, metadata !18, metadata !DIExpression(), metadata !28, metadata ptr %S, metadata !DIExpression()), !dbg !29
%agg.tmp = alloca %struct.LargeStruct, align 8
%0 = bitcast ptr %S to ptr, !dbg !30
%1 = bitcast ptr %S to ptr, !dbg !31
call void @llvm.memset.p0i8.i64(ptr align 4 %1, i8 0, i64 28, i1 false), !dbg !31, !DIAssignID !32
call void @llvm.dbg.assign(metadata i8 0, metadata !18, metadata !DIExpression(), metadata !32, metadata ptr %1, metadata !DIExpression()), !dbg !31
%2 = load i32, ptr @Glob, align 4, !dbg !33
%Var = getelementptr inbounds %struct.LargeStruct, ptr %S, i32 0, i32 3, !dbg !38
store i32 %2, ptr %Var, align 4, !dbg !39, !DIAssignID !42
call void @llvm.dbg.assign(metadata i32 %2, metadata !18, metadata !DIExpression(DW_OP_LLVM_fragment, 96, 32), metadata !42, metadata ptr %Var, metadata !DIExpression()), !dbg !39
%3 = bitcast ptr %agg.tmp to ptr, !dbg !43
%4 = bitcast ptr %S to ptr, !dbg !43
call void @llvm.memcpy.p0i8.p0i8.i64(ptr align 4 %3, ptr align 4 %4, i64 28, i1 false), !dbg !43
%call = call i32 @_Z3use11LargeStruct(ptr byval(%struct.LargeStruct) align 8 %agg.tmp), !dbg !45
%Var1 = getelementptr inbounds %struct.LargeStruct, ptr %S, i32 0, i32 3, !dbg !46
%5 = load i32, ptr %Var1, align 4, !dbg !46
%6 = bitcast ptr %S to ptr, !dbg !47
ret i32 %5, !dbg !48
}
declare void @llvm.memset.p0i8.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2
declare !dbg !49 dso_local i32 @_Z3use11LargeStruct(ptr byval(%struct.LargeStruct) align 8) #3
declare void @llvm.memcpy.p0i8.p0i8.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1
declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #4
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!10, !11, !12, !1000}
!llvm.ident = !{!13}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "Glob", scope: !2, file: !3, line: 7, type: !9, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, 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.cpp", directory: "/")
!4 = !{}
!5 = !{!0, !6}
!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
!7 = distinct !DIGlobalVariable(name: "Cond", scope: !2, file: !3, line: 8, type: !8, isLocal: false, isDefinition: true)
!8 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!10 = !{i32 7, !"Dwarf Version", i32 4}
!11 = !{i32 2, !"Debug Info Version", i32 3}
!12 = !{i32 1, !"wchar_size", i32 4}
!13 = !{!"clang version 12.0.0"}
!14 = distinct !DISubprogram(name: "example", linkageName: "_Z7examplev", scope: !3, file: !3, line: 10, type: !15, scopeLine: 10, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !17)
!15 = !DISubroutineType(types: !16)
!16 = !{!9}
!17 = !{!18}
!18 = !DILocalVariable(name: "S", scope: !14, file: !3, line: 11, type: !19)
!19 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "LargeStruct", file: !3, line: 2, size: 224, flags: DIFlagTypePassByValue, elements: !20, identifier: "_ZTS11LargeStruct")
!20 = !{!21, !22, !23, !24, !25, !26, !27}
!21 = !DIDerivedType(tag: DW_TAG_member, name: "A", scope: !19, file: !3, line: 3, baseType: !9, size: 32)
!22 = !DIDerivedType(tag: DW_TAG_member, name: "B", scope: !19, file: !3, line: 3, baseType: !9, size: 32, offset: 32)
!23 = !DIDerivedType(tag: DW_TAG_member, name: "C", scope: !19, file: !3, line: 3, baseType: !9, size: 32, offset: 64)
!24 = !DIDerivedType(tag: DW_TAG_member, name: "Var", scope: !19, file: !3, line: 4, baseType: !9, size: 32, offset: 96)
!25 = !DIDerivedType(tag: DW_TAG_member, name: "D", scope: !19, file: !3, line: 5, baseType: !9, size: 32, offset: 128)
!26 = !DIDerivedType(tag: DW_TAG_member, name: "E", scope: !19, file: !3, line: 5, baseType: !9, size: 32, offset: 160)
!27 = !DIDerivedType(tag: DW_TAG_member, name: "F", scope: !19, file: !3, line: 5, baseType: !9, size: 32, offset: 192)
!28 = distinct !DIAssignID()
!29 = !DILocation(line: 0, scope: !14)
!30 = !DILocation(line: 11, column: 3, scope: !14)
!31 = !DILocation(line: 11, column: 15, scope: !14)
!32 = distinct !DIAssignID()
!33 = !DILocation(line: 12, column: 11, scope: !14)
!38 = !DILocation(line: 12, column: 5, scope: !14)
!39 = !DILocation(line: 12, column: 9, scope: !14)
!42 = distinct !DIAssignID()
!43 = !DILocation(line: 13, column: 7, scope: !14)
!45 = !DILocation(line: 13, column: 3, scope: !14)
!46 = !DILocation(line: 14, column: 12, scope: !14)
!47 = !DILocation(line: 15, column: 1, scope: !14)
!48 = !DILocation(line: 14, column: 3, scope: !14)
!49 = !DISubprogram(name: "use", linkageName: "_Z3use11LargeStruct", scope: !3, file: !3, line: 9, type: !50, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !4)
!50 = !DISubroutineType(types: !51)
!51 = !{!9, !19}
!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
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