1 ; RUN: opt -S -o - -basicaa -domtree -gvn %s | FileCheck %s 2 3 target 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 19 define i32 @volatile_load(i32 %n) { 20 entry: 21 %cmp6 = icmp sgt i32 %n, 0 22 br i1 %cmp6, label %for.body.lr.ph, label %for.end 23 24 for.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 29 for.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 44 for.cond.for.end_crit_edge: 45 %add.lcssa = phi i32 [ %add, %for.body ] 46 br label %for.end 47 48 for.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 64 define i32 @overaligned_load(i32 %a, i32* nocapture %b) !dbg !13 { 65 entry: 66 %cmp = icmp sgt i32 %a, 0, !dbg !14 67 br i1 %cmp, label %if.then, label %if.else, !dbg !14 68 69 if.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 73 if.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 78 if.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 !7 = !{i32 2, !"Dwarf Version", i32 4} 96 !8 = !{i32 2, !"Debug Info Version", i32 3} 97 !9 = !{i32 1, !"PIC Level", i32 2} 98 99 !10 = !{} 100 !11 = !DISubroutineType(types: !10) 101 !12 = !DIFile(filename: "test.cpp", directory: "/tmp") 102 !13 = distinct !DISubprogram(name: "test", scope: !12, file: !12, line: 99, type: !11, isLocal: false, isDefinition: true, scopeLine: 100, flags: DIFlagPrototyped, isOptimized: false, variables: !10) 103 !14 = !DILocation(line: 100, column: 1, scope: !13) 104 !15 = !DILocation(line: 101, column: 1, scope: !13) 105 !16 = !DILocation(line: 102, column: 1, scope: !13) 106 !17 = !DILocation(line: 103, column: 1, scope: !13) 107 108
