1; RUN: opt -S -o - -basicaa -domtree -gvn %s | FileCheck %s 2 3target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" 4 5%struct.S1 = type { i32, i32 } 6 7@a2 = common global i32* null, align 8 8@a = common global i32* null, align 8 9@s1 = common global %struct.S1 zeroinitializer, align 8 10 11; Check that GVN doesn't determine %2 is partially redundant. 12 13; CHECK-LABEL: define i32 @volatile_load 14; CHECK: for.body: 15; CHECK: %2 = load i32, i32* 16; CHECK: %3 = load volatile i32, i32* 17; CHECK: for.cond.for.end_crit_edge: 18 19define i32 @volatile_load(i32 %n) { 20entry: 21 %cmp6 = icmp sgt i32 %n, 0 22 br i1 %cmp6, label %for.body.lr.ph, label %for.end 23 24for.body.lr.ph: 25 %0 = load i32*, i32** @a2, align 8, !tbaa !1 26 %1 = load i32*, i32** @a, align 8, !tbaa !1 27 br label %for.body 28 29for.body: 30 %indvars.iv = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next, %for.body ] 31 %s.09 = phi i32 [ 0, %for.body.lr.ph ], [ %add, %for.body ] 32 %p.08 = phi i32* [ %0, %for.body.lr.ph ], [ %incdec.ptr, %for.body ] 33 %2 = load i32, i32* %p.08, align 4, !tbaa !5 34 %arrayidx = getelementptr inbounds i32, i32* %1, i64 %indvars.iv 35 store i32 %2, i32* %arrayidx, align 4, !tbaa !5 36 %3 = load volatile i32, i32* %p.08, align 4, !tbaa !5 37 %add = add nsw i32 %3, %s.09 38 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 39 %incdec.ptr = getelementptr inbounds i32, i32* %p.08, i64 1 40 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 41 %exitcond = icmp ne i32 %lftr.wideiv, %n 42 br i1 %exitcond, label %for.body, label %for.cond.for.end_crit_edge 43 44for.cond.for.end_crit_edge: 45 %add.lcssa = phi i32 [ %add, %for.body ] 46 br label %for.end 47 48for.end: 49 %s.0.lcssa = phi i32 [ %add.lcssa, %for.cond.for.end_crit_edge ], [ 0, %entry ] 50 ret i32 %s.0.lcssa 51} 52 53; %1 is partially redundant if %0 can be widened to a 64-bit load. 54 55; CHECK-LABEL: define i32 @overaligned_load 56; CHECK: if.then: 57; CHECK: %0 = load i64 58; CHECK: [[LSHR:%[0-9]+]] = lshr i64 %0, 32, !dbg [[LSHR_LOC:![0-9]+]] 59; CHECK: trunc i64 [[LSHR]] to i32 60; CHECK: if.end: 61; CHECK-NOT: %1 = load i32, i32* 62; CHECK: [[LSHR_LOC]] = !DILocation(line: 101, column: 1, scope: !{{.*}}) 63 64define i32 @overaligned_load(i32 %a, i32* nocapture %b) !dbg !13 { 65entry: 66 %cmp = icmp sgt i32 %a, 0, !dbg !14 67 br i1 %cmp, label %if.then, label %if.else, !dbg !14 68 69if.then: 70 %0 = load i32, i32* getelementptr inbounds (%struct.S1, %struct.S1* @s1, i64 0, i32 0), align 8, !tbaa !5, !dbg !15 71 br label %if.end, !dbg !15 72 73if.else: 74 %arrayidx = getelementptr inbounds i32, i32* %b, i64 2, !dbg !16 75 store i32 10, i32* %arrayidx, align 4, !tbaa !5, !dbg !16 76 br label %if.end, !dbg !16 77 78if.end: 79 %i.0 = phi i32 [ %0, %if.then ], [ 0, %if.else ] 80 %p.0 = phi i32* [ getelementptr inbounds (%struct.S1, %struct.S1* @s1, i64 0, i32 0), %if.then ], [ %b, %if.else ] 81 %add.ptr = getelementptr inbounds i32, i32* %p.0, i64 1, !dbg !17 82 %1 = load i32, i32* %add.ptr, align 4, !tbaa !5, !dbg !17 83 %add1 = add nsw i32 %1, %i.0, !dbg !17 84 ret i32 %add1, !dbg !17 85} 86 87!1 = !{!2, !2, i64 0} 88!2 = !{!"any pointer", !3, i64 0} 89!3 = !{!"omnipotent char", !4, i64 0} 90!4 = !{!"Simple C/C++ TBAA"} 91!5 = !{!6, !6, i64 0} 92!6 = !{!"int", !3, i64 0} 93 94!llvm.module.flags = !{!7, !8, !9} 95!llvm.dbg.cu = !{!18} 96!7 = !{i32 2, !"Dwarf Version", i32 4} 97!8 = !{i32 2, !"Debug Info Version", i32 3} 98!9 = !{i32 1, !"PIC Level", i32 2} 99 100!10 = !{} 101!11 = !DISubroutineType(types: !10) 102!12 = !DIFile(filename: "test.cpp", directory: "/tmp") 103!13 = distinct !DISubprogram(name: "test", scope: !12, file: !12, line: 99, type: !11, isLocal: false, isDefinition: true, scopeLine: 100, flags: DIFlagPrototyped, isOptimized: false, unit: !18, variables: !10) 104!14 = !DILocation(line: 100, column: 1, scope: !13) 105!15 = !DILocation(line: 101, column: 1, scope: !13) 106!16 = !DILocation(line: 102, column: 1, scope: !13) 107!17 = !DILocation(line: 103, column: 1, scope: !13) 108!18 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang", 109 file: !12, 110 isOptimized: true, flags: "-O2", 111 splitDebugFilename: "abc.debug", emissionKind: 2) 112