9d172c8e9c
This switches to using DSE + MemorySSA by default again, after fixing the issues reported after the first commit. Notable fixes fc8200633122, a0017c2bc258. This reverts commit 3a59628f3cc26eb085acfc9cbdc97243ef71a6c5.
95 lines
4.2 KiB
LLVM
95 lines
4.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Test that the getelementptr generated when the dse pass determines that
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; a memset can be shortened has the debugloc carried over from the memset.
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; RUN: opt -S -march=native -dse < %s| FileCheck %s
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; CHECK: bitcast [5 x i64]* %{{[a-zA-Z_][a-zA-Z0-9_]*}} to i8*, !dbg
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; CHECK-NEXT: %{{[0-9]+}} = getelementptr inbounds i8, i8* %0, i64 32, !dbg ![[DBG:[0-9]+]]
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 16 %1, i8 0, i64 8, i1 false), !dbg ![[DBG:[0-9]+]]
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; CHECK: ![[DBG]] = !DILocation(line: 2,
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; The test IR is generated by running:
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;
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; clang Debugify_Dead_Store_Elimination.cpp -Wno-c++11-narrowing -S \
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; -emit-llvm -O0 -w -Xclang -disable-O0-optnone -march=native -fdeclspec \
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; --target=x86_64-gnu-linux-unknown -Werror=unreachable-code -o -
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;
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; Where Debugify_Dead_Store_Elimination.cpp contains:
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;
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; int a() {
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; long b[]{2, 2, 2, 2, 0};
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; if (a())
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; ;
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; }
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declare void @use([5 x i64]*)
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define dso_local i32 @_Z1av() !dbg !7 {
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entry:
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%retval = alloca i32, align 4
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%b = alloca [5 x i64], align 16
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call void @llvm.dbg.declare(metadata [5 x i64]* %b, metadata !11, metadata !DIExpression()), !dbg !16
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%0 = bitcast [5 x i64]* %b to i8*, !dbg !16
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call void @llvm.memset.p0i8.i64(i8* align 16 %0, i8 0, i64 40, i1 false), !dbg !16
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%1 = bitcast i8* %0 to [5 x i64]*, !dbg !16
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%2 = getelementptr inbounds [5 x i64], [5 x i64]* %1, i32 0, i32 0, !dbg !16
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store i64 2, i64* %2, align 16, !dbg !16
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%3 = getelementptr inbounds [5 x i64], [5 x i64]* %1, i32 0, i32 1, !dbg !16
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store i64 2, i64* %3, align 8, !dbg !16
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%4 = getelementptr inbounds [5 x i64], [5 x i64]* %1, i32 0, i32 2, !dbg !16
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store i64 2, i64* %4, align 16, !dbg !16
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%5 = getelementptr inbounds [5 x i64], [5 x i64]* %1, i32 0, i32 3, !dbg !16
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store i64 2, i64* %5, align 8, !dbg !16
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call void @use([5 x i64]* %b)
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%call = call i32 @_Z1av(), !dbg !17
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%tobool = icmp ne i32 %call, 0, !dbg !17
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br i1 %tobool, label %if.then, label %if.end, !dbg !19
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if.then: ; preds = %entry
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br label %if.end, !dbg !19
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if.end: ; preds = %if.then, %entry
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call void @llvm.trap(), !dbg !20
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unreachable, !dbg !20
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return: ; No predecessors!
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%6 = load i32, i32* %retval, align 4, !dbg !21
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ret i32 %6, !dbg !21
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.declare(metadata, metadata, metadata)
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; Function Attrs: argmemonly nounwind
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declare void @llvm.memset.p0i8.i64(i8* nocapture writeonly, i8, i64, i1 immarg)
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; Function Attrs: cold noreturn nounwind
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declare void @llvm.trap()
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 9.0.0 (https://github.com/llvm/llvm-project.git eb1a156d7f7ba56ea8f9a26da36e6a93d1e98bda)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "Debugify_Dead_Store_Elimination.cpp", directory: "")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 9.0.0 (https://github.com/llvm/llvm-project.git eb1a156d7f7ba56ea8f9a26da36e6a93d1e98bda)"}
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!7 = distinct !DISubprogram(name: "a", linkageName: "_Z1av", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DILocalVariable(name: "b", scope: !7, file: !1, line: 2, type: !12)
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!12 = !DICompositeType(tag: DW_TAG_array_type, baseType: !13, size: 320, elements: !14)
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!13 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
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!14 = !{!15}
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!15 = !DISubrange(count: 5)
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!16 = !DILocation(line: 2, column: 8, scope: !7)
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!17 = !DILocation(line: 3, column: 7, scope: !18)
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!18 = distinct !DILexicalBlock(scope: !7, file: !1, line: 3, column: 7)
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!19 = !DILocation(line: 3, column: 7, scope: !7)
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!20 = !DILocation(line: 3, column: 9, scope: !18)
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!21 = !DILocation(line: 5, column: 1, scope: !7)
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