1 ; RUN: opt %s -S -o - -loop-unroll | FileCheck %s 2 ; generated at -O3 from: 3 ; void f() { 4 ; for (int i = 1; i <=32; i <<=2 ) 5 ; bar(i>>1); 6 ; } 7 source_filename = "/tmp/loop.c" 8 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" 9 target triple = "x86_64-apple-macosx10.13.0" 10 11 ; Function Attrs: nounwind ssp uwtable 12 define void @f() local_unnamed_addr #0 !dbg !8 { 13 entry: 14 tail call void @llvm.dbg.value(metadata i32 1, metadata !12, metadata !DIExpression()), !dbg !15 15 br label %for.body, !dbg !16 16 17 for.cond.cleanup: ; preds = %for.body 18 ret void, !dbg !17 19 20 for.body: ; preds = %entry, %for.body 21 %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 !15 23 %shr = ashr i32 %i.04, 1, !dbg !18 24 25 ; The loop gets unrolled entirely. 26 ; CHECK: call void @llvm.dbg.value(metadata i32 1, metadata !12, metadata !DIExpression()), !dbg !15 27 ; CHECK: call void @llvm.dbg.value(metadata i32 4, metadata !12, metadata !DIExpression()), !dbg !15 28 ; CHECK: call void @llvm.dbg.value(metadata i32 16, metadata !12, metadata !DIExpression()), !dbg !15 29 ; CHECK: call void @llvm.dbg.value(metadata i32 64, metadata !12, metadata !DIExpression()), !dbg !15 30 31 %call = tail call i32 (i32, ...) bitcast (i32 (...)* @bar to i32 (i32, ...)*)(i32 %shr) #3, !dbg !20 32 %shl = shl i32 %i.04, 2, !dbg !21 33 tail call void @llvm.dbg.value(metadata i32 %shl, metadata !12, metadata !DIExpression()), !dbg !15 34 %cmp = icmp slt i32 %shl, 33, !dbg !22 35 br i1 %cmp, label %for.body, label %for.cond.cleanup, !dbg !16, !llvm.loop !23 36 } 37 38 declare i32 @bar(...) local_unnamed_addr 39 40 ; Function Attrs: nounwind readnone speculatable 41 declare void @llvm.dbg.value(metadata, metadata, metadata) #2 42 43 attributes #0 = { nounwind ssp uwtable } 44 attributes #2 = { nounwind readnone speculatable } 45 attributes #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
