103 lines
4.3 KiB
LLVM
103 lines
4.3 KiB
LLVM
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; Confirm that the line number for the for.body.preheader block
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; branch is the the start of the loop.
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; RUN: opt -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -loop-simplify -S <%s | FileCheck %s
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;
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; CHECK: for.body.preheader:
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; CHECK-NEXT: br label %for.body, !dbg ![[DL:[0-9]+]]
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; CHECK: ![[DL]] = !DILocation(line: 8,
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; This IR can be generated by running:
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; clang src.cpp -O0 -g -S -emit-llvm -Xclang -disable-O0-optnone -o - | \
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; opt -O2 -S -opt-bisect-limit=27 -o -
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;
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; Where src.cpp contains:
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; int foo(int count, int *bar)
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; {
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; if (count + 1 > 256)
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; return 0;
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;
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; int ret = count;
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; int tmp;
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; for (int j = 0; j < count; j++) {
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; tmp = bar[j];
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; ret += tmp;
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; }
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;
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; return ret;
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; }
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define dso_local i32 @"foo"(i32 %count, i32* nocapture readonly %bar) local_unnamed_addr !dbg !8 {
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entry:
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%cmp = icmp sgt i32 %count, 255, !dbg !16
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br i1 %cmp, label %return, label %for.cond.preheader, !dbg !16
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for.cond.preheader: ; preds = %entry
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%cmp16 = icmp slt i32 0, %count, !dbg !19
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br i1 %cmp16, label %for.body.lr.ph, label %return.loopexit, !dbg !19
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for.body.lr.ph: ; preds = %for.cond.preheader
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br label %for.body, !dbg !19
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for.body: ; preds = %for.body.lr.ph, %for.body
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%j.08 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
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%ret.07 = phi i32 [ %count, %for.body.lr.ph ], [ %add2, %for.body ]
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%0 = zext i32 %j.08 to i64, !dbg !22
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%arrayidx = getelementptr inbounds i32, i32* %bar, i64 %0, !dbg !22
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%1 = load i32, i32* %arrayidx, align 4, !dbg !22
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%add2 = add nsw i32 %1, %ret.07, !dbg !27
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%inc = add nuw nsw i32 %j.08, 1, !dbg !28
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%cmp1 = icmp slt i32 %inc, %count, !dbg !19
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br i1 %cmp1, label %for.body, label %for.cond.return.loopexit_crit_edge, !dbg !19, !llvm.loop !29
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for.cond.return.loopexit_crit_edge: ; preds = %for.body
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%split = phi i32 [ %add2, %for.body ]
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br label %return.loopexit, !dbg !19
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return.loopexit: ; preds = %for.cond.return.loopexit_crit_edge, %for.cond.preheader
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%ret.0.lcssa = phi i32 [ %split, %for.cond.return.loopexit_crit_edge ], [ %count, %for.cond.preheader ], !dbg !31
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br label %return, !dbg !32
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return: ; preds = %return.loopexit, %entry
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%retval.0 = phi i32 [ 0, %entry ], [ %ret.0.lcssa, %return.loopexit ], !dbg !31
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ret i32 %retval.0, !dbg !32
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "src.cpp", directory: "")
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!2 = !{}
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!3 = !{i32 2, !"CodeView", i32 1}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 2}
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!6 = !{i32 7, !"PIC Level", i32 2}
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!7 = !{!""}
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!8 = distinct !DISubprogram(name: "foo", linkageName: "?foo@@YAHHPEAH@Z", scope: !1, file: !1, line: 1, type: !9, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!9 = !DISubroutineType(types: !10)
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!10 = !{!11, !11, !12}
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!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
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!13 = !DILocalVariable(name: "bar", arg: 2, scope: !8, file: !1, line: 1, type: !12)
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!14 = !DILocation(line: 1, scope: !8)
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!15 = !DILocalVariable(name: "count", arg: 1, scope: !8, file: !1, line: 1, type: !11)
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!16 = !DILocation(line: 3, scope: !8)
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!17 = !DILocalVariable(name: "j", scope: !18, file: !1, line: 8, type: !11)
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!18 = distinct !DILexicalBlock(scope: !8, file: !1, line: 8)
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!19 = !DILocation(line: 8, scope: !18)
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!20 = !DILocalVariable(name: "ret", scope: !8, file: !1, line: 6, type: !11)
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!21 = !DILocation(line: 6, scope: !8)
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!22 = !DILocation(line: 9, scope: !23)
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!23 = distinct !DILexicalBlock(scope: !24, file: !1, line: 8)
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!24 = distinct !DILexicalBlock(scope: !18, file: !1, line: 8)
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!25 = !DILocalVariable(name: "tmp", scope: !8, file: !1, line: 7, type: !11)
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!26 = !DILocation(line: 7, scope: !8)
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!27 = !DILocation(line: 10, scope: !23)
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!28 = !DILocation(line: 8, scope: !24)
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!29 = distinct !{!29, !19, !30}
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!30 = !DILocation(line: 11, scope: !18)
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!31 = !DILocation(line: 0, scope: !8)
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!32 = !DILocation(line: 14, scope: !8)
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