c383f4d655
Prior to this patch, variadic DIExpressions (i.e. ones that contain DW_OP_LLVM_arg) could only be created by salvaging debug values to create stack value expressions, resulting in a DBG_VALUE_LIST being created. As of the previous patch in this patch stack, DBG_INSTR_REF's syntax has been changed to match DBG_VALUE_LIST in preparation for supporting variadic expressions. This patch adds some minor changes needed to allow variadic expressions that aren't stack values to exist, and allows variadic expressions that are trivially reduceable to non-variadic expressions to be handled similarly to non-variadic expressions. Reviewed by: jmorse Differential Revision: https://reviews.llvm.org/D133926
115 lines
5.3 KiB
LLVM
115 lines
5.3 KiB
LLVM
; RUN: llc %s -stop-after=finalize-isel -o - -experimental-assignment-tracking \
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; RUN: | FileCheck %s --implicit-check-not=DBG
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;; Tiny loop with a store sunk out of it:
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;; void e();
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;; void es(int*);
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;; int *g;
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;; int getInt();
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;; int f(int a, int b) {
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;; int z = getInt();
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;; while (g) {
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;; e();
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;; a = z;
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;; }
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;; es(&a);
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;; return a;
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;; }
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;;
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;; Store to `a` has been sunk out the loop - there's a dbg.assign left in the
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;; loop that is linked the store that is now outside it. Check that the memory
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;; location is not used inside the loop and is reinstated after the sunk store.
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; CHECK-DAG: ![[A:[0-9]+]] = !DILocalVariable(name: "a",
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; CHECK-LABEL: bb.0.entry:
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; CHECK: DBG_VALUE $edi, $noreg, ![[A]], !DIExpression()
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; CHECK: CALL64pcrel32 @getInt{{.*}}debug-instr-number 1
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; CHECK-LABEL: bb.2.while.body:
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; CHECK: DBG_INSTR_REF ![[A]], !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 6)
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; CHECK-LABEL: bb.3.while.end:
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; CHECK: MOV32mr %stack.0.a.addr, 1, $noreg, 0, $noreg, %1
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; CHECK-NEXT: DBG_VALUE %stack.0.a.addr, $noreg, ![[A]], !DIExpression(DW_OP_deref)
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target triple = "x86_64-unknown-linux-gnu"
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@g = dso_local local_unnamed_addr global ptr null, align 8, !dbg !0
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; Function Attrs: mustprogress uwtable
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define dso_local noundef i32 @_Z1fii(i32 noundef %a, i32 noundef %b) local_unnamed_addr #0 !dbg !12 {
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entry:
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%a.addr = alloca i32, align 4, !DIAssignID !18
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call void @llvm.dbg.assign(metadata i1 undef, metadata !16, metadata !DIExpression(), metadata !18, metadata ptr %a.addr, metadata !DIExpression()), !dbg !19
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call void @llvm.dbg.assign(metadata i32 %a, metadata !16, metadata !DIExpression(), metadata !20, metadata ptr %a.addr, metadata !DIExpression()), !dbg !19
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%z = call i32 @getInt()
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%0 = load ptr, ptr @g, align 8, !dbg !22
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%tobool.not1 = icmp eq ptr %0, null, !dbg !22
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br i1 %tobool.not1, label %while.end, label %while.body, !dbg !27
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while.body: ; preds = %entry, %while.body
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tail call void @_Z1ev(), !dbg !28
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call void @llvm.dbg.assign(metadata i32 %z, metadata !16, metadata !DIExpression(), metadata !20, metadata ptr %a.addr, metadata !DIExpression()), !dbg !19
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%1 = load ptr, ptr @g, align 8, !dbg !22
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%tobool.not = icmp eq ptr %1, null, !dbg !22
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br i1 %tobool.not, label %while.end, label %while.body, !dbg !27, !llvm.loop !30
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while.end: ; preds = %while.body, %entry
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%storemerge.lcssa = phi i32 [ %a, %entry ], [ %b, %while.body ]
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store i32 %storemerge.lcssa, ptr %a.addr, align 4, !DIAssignID !20
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call void @_Z2esPi(ptr noundef nonnull %a.addr), !dbg !35
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%2 = load i32, ptr %a.addr, align 4, !dbg !36
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%r = add i32 %2, %z
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ret i32 %r, !dbg !37
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}
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declare !dbg !38 dso_local void @_Z1ev() local_unnamed_addr #1
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declare !dbg !42 dso_local void @_Z2esPi(ptr noundef) local_unnamed_addr #1
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declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #2
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declare dso_local i32 @getInt()
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!7, !8, !9, !10}
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!llvm.ident = !{!11}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "g", scope: !2, file: !3, line: 4, type: !5, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !3, producer: "clang version 14.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, globals: !4, splitDebugInlining: false, nameTableKind: None)
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!3 = !DIFile(filename: "test.cpp", directory: "/")
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!4 = !{!0}
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!5 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !6, size: 64)
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!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!7 = !{i32 7, !"Dwarf Version", i32 5}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{i32 1, !"wchar_size", i32 4}
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!10 = !{i32 7, !"uwtable", i32 1}
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!11 = !{!"clang version 14.0.0"}
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!12 = distinct !DISubprogram(name: "f", linkageName: "_Z1fii", scope: !3, file: !3, line: 5, type: !13, scopeLine: 5, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !15)
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!13 = !DISubroutineType(types: !14)
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!14 = !{!6, !6, !6}
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!15 = !{!16, !17}
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!16 = !DILocalVariable(name: "a", arg: 1, scope: !12, file: !3, line: 5, type: !6)
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!17 = !DILocalVariable(name: "b", arg: 2, scope: !12, file: !3, line: 5, type: !6)
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!18 = distinct !DIAssignID()
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!19 = !DILocation(line: 0, scope: !12)
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!20 = distinct !DIAssignID()
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!21 = distinct !DIAssignID()
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!22 = !DILocation(line: 6, column: 10, scope: !12)
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!27 = !DILocation(line: 6, column: 3, scope: !12)
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!28 = !DILocation(line: 7, column: 5, scope: !29)
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!29 = distinct !DILexicalBlock(scope: !12, file: !3, line: 6, column: 13)
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!30 = distinct !{!30, !27, !31, !32}
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!31 = !DILocation(line: 9, column: 3, scope: !12)
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!32 = !{!"llvm.loop.mustprogress"}
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!35 = !DILocation(line: 10, column: 3, scope: !12)
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!36 = !DILocation(line: 11, column: 10, scope: !12)
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!37 = !DILocation(line: 11, column: 3, scope: !12)
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!38 = !DISubprogram(name: "e", linkageName: "_Z1ev", scope: !3, file: !3, line: 2, type: !39, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !41)
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!39 = !DISubroutineType(types: !40)
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!40 = !{null}
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!41 = !{}
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!42 = !DISubprogram(name: "es", linkageName: "_Z2esPi", scope: !3, file: !3, line: 3, type: !43, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !41)
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!43 = !DISubroutineType(types: !44)
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!44 = !{null, !5}
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