1; RUN: opt < %s -gvn -o /dev/null -pass-remarks-output=%t -S 2; RUN: cat %t | FileCheck %s 3 4; CHECK: --- !Missed 5; CHECK-NEXT: Pass: gvn 6; CHECK-NEXT: Name: LoadClobbered 7; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 2, Column: 2 } 8; CHECK-NEXT: Function: multipleUsers 9; CHECK-NEXT: Args: 10; CHECK-NEXT: - String: 'load of type ' 11; CHECK-NEXT: - Type: i32 12; CHECK-NEXT: - String: ' not eliminated' 13; CHECK-NEXT: - String: ' in favor of ' 14; CHECK-NEXT: - OtherAccess: store 15; CHECK-NEXT: - String: ' because it is clobbered by ' 16; CHECK-NEXT: - ClobberedBy: call 17; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 1, Column: 1 } 18; CHECK-NEXT: ... 19; CHECK: --- !Missed 20; CHECK-NEXT: Pass: gvn 21; CHECK-NEXT: Name: LoadClobbered 22; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 4, Column: 4 } 23; CHECK-NEXT: Function: multipleUsers 24; CHECK-NEXT: Args: 25; CHECK-NEXT: - String: 'load of type ' 26; CHECK-NEXT: - Type: i32 27; CHECK-NEXT: - String: ' not eliminated' 28; CHECK-NEXT: - String: ' in favor of ' 29; CHECK-NEXT: - OtherAccess: load 30; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 2, Column: 2 } 31; CHECK-NEXT: - String: ' because it is clobbered by ' 32; CHECK-NEXT: - ClobberedBy: call 33; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 3, Column: 3 } 34; CHECK-NEXT: ... 35 36; ModuleID = 'bugpoint-reduced-simplified.bc' 37source_filename = "gvn-test.c" 38target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" 39target triple = "x86_64-unknown-linux-gnu" 40 41; Tests that a last clobbering use can be determined even in the presence of 42; multiple users, given that one of them lies on a path between every other 43; potentially clobbering use and the load. 44 45define dso_local void @multipleUsers(i32* %a, i32 %b) local_unnamed_addr #0 { 46entry: 47 store i32 %b, i32* %a, align 4 48 tail call void @clobberingFunc() #1, !dbg !10 49 %0 = load i32, i32* %a, align 4, !dbg !11 50 tail call void @clobberingFunc() #1, !dbg !12 51 %1 = load i32, i32* %a, align 4, !dbg !13 52 %add2 = add nsw i32 %1, %0 53 ret void 54} 55 56; CHECK: --- !Missed 57; CHECK-NEXT: Pass: gvn 58; CHECK-NEXT: Name: LoadClobbered 59; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 2, Column: 2 } 60; CHECK-NEXT: Function: multipleUsers2 61; CHECK-NEXT: Args: 62; CHECK-NEXT: - String: 'load of type ' 63; CHECK-NEXT: - Type: i32 64; CHECK-NEXT: - String: ' not eliminated' 65; CHECK-NEXT: - String: ' in favor of ' 66; CHECK-NEXT: - OtherAccess: store 67; CHECK-NEXT: - String: ' because it is clobbered by ' 68; CHECK-NEXT: - ClobberedBy: call 69; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 1, Column: 1 } 70; CHECK-NEXT: ... 71; CHECK: --- !Missed 72; CHECK-NEXT: Pass: gvn 73; CHECK-NEXT: Name: LoadClobbered 74; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 4, Column: 4 } 75; CHECK-NEXT: Function: multipleUsers2 76; CHECK-NEXT: Args: 77; CHECK-NEXT: - String: 'load of type ' 78; CHECK-NEXT: - Type: i32 79; CHECK-NEXT: - String: ' not eliminated' 80; CHECK-NEXT: - String: ' in favor of ' 81; CHECK-NEXT: - OtherAccess: load 82; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 2, Column: 2 } 83; CHECK-NEXT: - String: ' because it is clobbered by ' 84; CHECK-NEXT: - ClobberedBy: call 85; CHECK-NEXT: DebugLoc: { File: '/tmp/s.c', Line: 3, Column: 3 } 86; CHECK-NEXT: ... 87 88; Ignore uses in other functions 89 90define dso_local void @multipleUsers2(i32 %b) local_unnamed_addr #0 { 91entry: 92 store i32 %b, i32* @g, align 4 93 tail call void @clobberingFunc() #1, !dbg !15 94 %0 = load i32, i32* @g, align 4, !dbg !16 95 tail call void @clobberingFunc() #1, !dbg !17 96 %1 = load i32, i32* @g, align 4, !dbg !18 97 %add3 = add nsw i32 %1, %0 98 ret void 99} 100 101declare dso_local void @clobberingFunc() local_unnamed_addr #0 102 103@g = external global i32 104 105define dso_local void @globalUser(i32 %b) local_unnamed_addr #0 { 106entry: 107 store i32 %b, i32* @g, align 4 108 ret void 109} 110 111 112attributes #0 = { "use-soft-float"="false" } 113attributes #1 = { nounwind } 114 115!llvm.dbg.cu = !{!1} 116!llvm.module.flags = !{!4, !5, !6} 117!llvm.ident = !{!0} 118 119!0 = !{!"clang version 10.0.0 (git@github.com:llvm/llvm-project.git a2f6ae9abffcba260c22bb235879f0576bf3b783)"} 120!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang version 4.0.0 (trunk 282540) (llvm/trunk 282542)", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !3) 121!2 = !DIFile(filename: "/tmp/s.c", directory: "/tmp") 122!3 = !{} 123!4 = !{i32 2, !"Dwarf Version", i32 4} 124!5 = !{i32 2, !"Debug Info Version", i32 3} 125!6 = !{i32 1, !"PIC Level", i32 2} 126!8 = distinct !DISubprogram(name: "multipleUsers", scope: !2, file: !2, line: 1, type: !9, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !1, retainedNodes: !3) 127!9 = !DISubroutineType(types: !3) 128!10 = !DILocation(line: 1, column: 1, scope: !8) 129!11 = !DILocation(line: 2, column: 2, scope: !8) 130!12 = !DILocation(line: 3, column: 3, scope: !8) 131!13 = !DILocation(line: 4, column: 4, scope: !8) 132!14 = distinct !DISubprogram(name: "multipleUsers2", scope: !2, file: !2, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !1, retainedNodes: !3) 133!15 = !DILocation(line: 1, column: 1, scope: !14) 134!16 = !DILocation(line: 2, column: 2, scope: !14) 135!17 = !DILocation(line: 3, column: 3, scope: !14) 136!18 = !DILocation(line: 4, column: 4, scope: !14) 137