1 ; RUN: opt -instcombine %s -S | FileCheck %s 2 ; 3 ; Generate me from: 4 ; clang -cc1 -triple thumbv7-apple-ios7.0.0 -S -target-abi apcs-gnu -gdwarf-2 -Os test.c -o test.ll -emit-llvm 5 ; void run(float r) 6 ; { 7 ; int count = r; 8 ; float vla[count]; 9 ; vla[0] = r; 10 ; for (int i = 0; i < count; i++) 11 ; vla[i] /= r; 12 ; } 13 ; rdar://problem/15464571 14 ; 15 ; ModuleID = 'test.c' 16 target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:32-n32-S32" 17 target triple = "thumbv7-apple-ios8.0.0" 18 19 ; Function Attrs: nounwind optsize readnone 20 define void @run(float %r) #0 { 21 entry: 22 tail call void @llvm.dbg.declare(metadata float %r, metadata !11, metadata !MDExpression()), !dbg !22 23 %conv = fptosi float %r to i32, !dbg !23 24 tail call void @llvm.dbg.declare(metadata i32 %conv, metadata !12, metadata !MDExpression()), !dbg !23 25 %vla = alloca float, i32 %conv, align 4, !dbg !24 26 tail call void @llvm.dbg.declare(metadata float* %vla, metadata !14, metadata !MDExpression(DW_OP_deref)), !dbg !24 27 ; The VLA alloca should be described by a dbg.declare: 28 ; CHECK: call void @llvm.dbg.declare(metadata float* %vla, metadata ![[VLA:.*]], metadata {{.*}}) 29 ; The VLA alloca and following store into the array should not be lowered to like this: 30 ; CHECK-NOT: call void @llvm.dbg.value(metadata float %r, i64 0, metadata ![[VLA]]) 31 ; the backend interprets this as "vla has the location of %r". 32 store float %r, float* %vla, align 4, !dbg !25, !tbaa !26 33 tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !18, metadata !MDExpression()), !dbg !30 34 %cmp8 = icmp sgt i32 %conv, 0, !dbg !30 35 br i1 %cmp8, label %for.body, label %for.end, !dbg !30 36 37 for.body: ; preds = %entry, %for.body.for.body_crit_edge 38 %0 = phi float [ %.pre, %for.body.for.body_crit_edge ], [ %r, %entry ] 39 %i.09 = phi i32 [ %inc, %for.body.for.body_crit_edge ], [ 0, %entry ] 40 %arrayidx2 = getelementptr inbounds float, float* %vla, i32 %i.09, !dbg !31 41 %div = fdiv float %0, %r, !dbg !31 42 store float %div, float* %arrayidx2, align 4, !dbg !31, !tbaa !26 43 %inc = add nsw i32 %i.09, 1, !dbg !30 44 tail call void @llvm.dbg.value(metadata i32 %inc, i64 0, metadata !18, metadata !MDExpression()), !dbg !30 45 %exitcond = icmp eq i32 %inc, %conv, !dbg !30 46 br i1 %exitcond, label %for.end, label %for.body.for.body_crit_edge, !dbg !30 47 48 for.body.for.body_crit_edge: ; preds = %for.body 49 %arrayidx2.phi.trans.insert = getelementptr inbounds float, float* %vla, i32 %inc 50 %.pre = load float, float* %arrayidx2.phi.trans.insert, align 4, !dbg !31, !tbaa !26 51 br label %for.body, !dbg !30 52 53 for.end: ; preds = %for.body, %entry 54 ret void, !dbg !32 55 } 56 57 ; Function Attrs: nounwind readnone 58 declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 59 60 ; Function Attrs: nounwind readnone 61 declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1 62 63 attributes #0 = { nounwind optsize readnone "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } 64 attributes #1 = { nounwind readnone } 65 66 !llvm.dbg.cu = !{!0} 67 !llvm.module.flags = !{!20, !33} 68 !llvm.ident = !{!21} 69 70 !0 = !MDCompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 ", isOptimized: true, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2) 71 !1 = !MDFile(filename: "<unknown>", directory: "/Volumes/Data/radar/15464571") 72 !2 = !{} 73 !3 = !{!4} 74 !4 = !MDSubprogram(name: "run", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 2, file: !5, scope: !6, type: !7, function: void (float)* @run, variables: !10) 75 !5 = !MDFile(filename: "test.c", directory: "/Volumes/Data/radar/15464571") 76 !6 = !MDFile(filename: "test.c", directory: "/Volumes/Data/radar/15464571") 77 !7 = !MDSubroutineType(types: !8) 78 !8 = !{null, !9} 79 !9 = !MDBasicType(tag: DW_TAG_base_type, name: "float", size: 32, align: 32, encoding: DW_ATE_float) 80 !10 = !{!11, !12, !14, !18} 81 !11 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "r", line: 1, arg: 1, scope: !4, file: !6, type: !9) 82 !12 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "count", line: 3, scope: !4, file: !6, type: !13) 83 !13 = !MDBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 84 !14 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "vla", line: 4, scope: !4, file: !6, type: !15) 85 !15 = !MDCompositeType(tag: DW_TAG_array_type, align: 32, baseType: !9, elements: !16) 86 !16 = !{!17} 87 !17 = !MDSubrange(count: -1) 88 !18 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "i", line: 6, scope: !19, file: !6, type: !13) 89 !19 = distinct !MDLexicalBlock(line: 6, column: 0, file: !5, scope: !4) 90 !20 = !{i32 2, !"Dwarf Version", i32 2} 91 !21 = !{!"clang version 3.4 "} 92 !22 = !MDLocation(line: 1, scope: !4) 93 !23 = !MDLocation(line: 3, scope: !4) 94 !24 = !MDLocation(line: 4, scope: !4) 95 !25 = !MDLocation(line: 5, scope: !4) 96 !26 = !{!27, !27, i64 0} 97 !27 = !{!"float", !28, i64 0} 98 !28 = !{!"omnipotent char", !29, i64 0} 99 !29 = !{!"Simple C/C++ TBAA"} 100 !30 = !MDLocation(line: 6, scope: !19) 101 !31 = !MDLocation(line: 7, scope: !19) 102 !32 = !MDLocation(line: 8, scope: !4) 103 !33 = !{i32 1, !"Debug Info Version", i32 3} 104
