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1; RUN: opt %s -S -o - -passes=loop-unroll | FileCheck %s2; generated at -O3 from:3; void f() {4; for (int i = 1; i <=32; i <<=2 )5; bar(i>>1);6; }7source_filename = "/tmp/loop.c"8target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"9target triple = "x86_64-apple-macosx10.13.0"10 11; Function Attrs: nounwind ssp uwtable12define void @f() local_unnamed_addr #0 !dbg !8 {13entry:14 tail call void @llvm.dbg.value(metadata i32 1, metadata !12, metadata !DIExpression()), !dbg !1515 br label %for.body, !dbg !1616 17for.cond.cleanup: ; preds = %for.body18 ret void, !dbg !1719 20for.body: ; preds = %entry, %for.body21 %i.04 = phi i32 [ 1, %entry ], [ %shl, %for.body ]22 tail call void @llvm.dbg.value(metadata i32 %i.04, metadata !12, metadata !DIExpression()), !dbg !1523 %shr = ashr i32 %i.04, 1, !dbg !1824 25 ; The loop gets unrolled entirely.26 ; CHECK: #dbg_value(i32 1, !12, !DIExpression(), !1527 ; CHECK: #dbg_value(i32 4, !12, !DIExpression(), !1528 ; CHECK: #dbg_value(i32 16, !12, !DIExpression(), !1529 ; CHECK: #dbg_value(i32 64, !12, !DIExpression(), !1530 31 %call = tail call i32 (i32, ...) @bar(i32 %shr) #3, !dbg !2032 %shl = shl i32 %i.04, 2, !dbg !2133 tail call void @llvm.dbg.value(metadata i32 %shl, metadata !12, metadata !DIExpression()), !dbg !1534 %cmp = icmp slt i32 %shl, 33, !dbg !2235 br i1 %cmp, label %for.body, label %for.cond.cleanup, !dbg !16, !llvm.loop !2336}37 38declare i32 @bar(...) local_unnamed_addr39 40; Function Attrs: nounwind readnone speculatable41declare void @llvm.dbg.value(metadata, metadata, metadata) #242 43attributes #0 = { nounwind ssp uwtable }44attributes #2 = { nounwind readnone speculatable }45attributes #3 = { nounwind }46 47!llvm.dbg.cu = !{!0}48!llvm.module.flags = !{!3, !4, !5, !6}49!llvm.ident = !{!7}50 51!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 (trunk 317113) (llvm/trunk 317122)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)52!1 = !DIFile(filename: "/tmp/loop.c", directory: "/Data/llvm")53!2 = !{}54!3 = !{i32 2, !"Dwarf Version", i32 4}55!4 = !{i32 2, !"Debug Info Version", i32 3}56!5 = !{i32 1, !"wchar_size", i32 4}57!6 = !{i32 7, !"PIC Level", i32 2}58!7 = !{!"clang version 6.0.0 (trunk 317113) (llvm/trunk 317122)"}59!8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !9, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !11)60!9 = !DISubroutineType(types: !10)61!10 = !{null}62!11 = !{!12}63!12 = !DILocalVariable(name: "i", scope: !13, file: !1, line: 2, type: !14)64!13 = distinct !DILexicalBlock(scope: !8, file: !1, line: 2, column: 3)65!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)66!15 = !DILocation(line: 2, column: 12, scope: !13)67!16 = !DILocation(line: 2, column: 3, scope: !13)68!17 = !DILocation(line: 4, column: 1, scope: !8)69!18 = !DILocation(line: 3, column: 10, scope: !19)70!19 = distinct !DILexicalBlock(scope: !13, file: !1, line: 2, column: 3)71!20 = !DILocation(line: 3, column: 5, scope: !19)72!21 = !DILocation(line: 2, column: 29, scope: !19)73!22 = !DILocation(line: 2, column: 21, scope: !19)74!23 = distinct !{!23, !16, !24}75!24 = !DILocation(line: 3, column: 13, scope: !13)76