1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt -S -o - -passes=gvn %s | FileCheck %s
4 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
6 %struct.S1 = type { i32, i32 }
8 @a2 = common global ptr null, align 8
9 @a = common global ptr null, align 8
10 @s1 = common global %struct.S1 zeroinitializer, align 8
12 ; Check that GVN doesn't determine %2 is partially redundant.
14 define i32 @volatile_load(i32 %n) {
15 ; CHECK-LABEL: @volatile_load(
17 ; CHECK-NEXT: [[CMP6:%.*]] = icmp sgt i32 [[N:%.*]], 0
18 ; CHECK-NEXT: br i1 [[CMP6]], label [[FOR_BODY_LR_PH:%.*]], label [[FOR_END:%.*]]
19 ; CHECK: for.body.lr.ph:
20 ; CHECK-NEXT: [[TMP0:%.*]] = load ptr, ptr @a2, align 8, !tbaa [[TBAA5:![0-9]+]]
21 ; CHECK-NEXT: [[TMP1:%.*]] = load ptr, ptr @a, align 8, !tbaa [[TBAA5]]
22 ; CHECK-NEXT: br label [[FOR_BODY:%.*]]
24 ; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ 0, [[FOR_BODY_LR_PH]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
25 ; CHECK-NEXT: [[S_09:%.*]] = phi i32 [ 0, [[FOR_BODY_LR_PH]] ], [ [[ADD:%.*]], [[FOR_BODY]] ]
26 ; CHECK-NEXT: [[P_08:%.*]] = phi ptr [ [[TMP0]], [[FOR_BODY_LR_PH]] ], [ [[INCDEC_PTR:%.*]], [[FOR_BODY]] ]
27 ; CHECK-NEXT: [[TMP2:%.*]] = load i32, ptr [[P_08]], align 4, !tbaa [[TBAA9:![0-9]+]]
28 ; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i64 [[INDVARS_IV]]
29 ; CHECK-NEXT: store i32 [[TMP2]], ptr [[ARRAYIDX]], align 4, !tbaa [[TBAA9]]
30 ; CHECK-NEXT: [[TMP3:%.*]] = load volatile i32, ptr [[P_08]], align 4, !tbaa [[TBAA9]]
31 ; CHECK-NEXT: [[ADD]] = add nsw i32 [[TMP3]], [[S_09]]
32 ; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
33 ; CHECK-NEXT: [[INCDEC_PTR]] = getelementptr inbounds i32, ptr [[P_08]], i64 1
34 ; CHECK-NEXT: [[LFTR_WIDEIV:%.*]] = trunc i64 [[INDVARS_IV_NEXT]] to i32
35 ; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[LFTR_WIDEIV]], [[N]]
36 ; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_BODY]], label [[FOR_COND_FOR_END_CRIT_EDGE:%.*]]
37 ; CHECK: for.cond.for.end_crit_edge:
38 ; CHECK-NEXT: br label [[FOR_END]]
40 ; CHECK-NEXT: [[S_0_LCSSA:%.*]] = phi i32 [ [[ADD]], [[FOR_COND_FOR_END_CRIT_EDGE]] ], [ 0, [[ENTRY:%.*]] ]
41 ; CHECK-NEXT: ret i32 [[S_0_LCSSA]]
44 %cmp6 = icmp sgt i32 %n, 0
45 br i1 %cmp6, label %for.body.lr.ph, label %for.end
48 %0 = load ptr, ptr @a2, align 8, !tbaa !1
49 %1 = load ptr, ptr @a, align 8, !tbaa !1
53 %indvars.iv = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next, %for.body ]
54 %s.09 = phi i32 [ 0, %for.body.lr.ph ], [ %add, %for.body ]
55 %p.08 = phi ptr [ %0, %for.body.lr.ph ], [ %incdec.ptr, %for.body ]
56 %2 = load i32, ptr %p.08, align 4, !tbaa !5
57 %arrayidx = getelementptr inbounds i32, ptr %1, i64 %indvars.iv
58 store i32 %2, ptr %arrayidx, align 4, !tbaa !5
59 %3 = load volatile i32, ptr %p.08, align 4, !tbaa !5
60 %add = add nsw i32 %3, %s.09
61 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
62 %incdec.ptr = getelementptr inbounds i32, ptr %p.08, i64 1
63 %lftr.wideiv = trunc i64 %indvars.iv.next to i32
64 %exitcond = icmp ne i32 %lftr.wideiv, %n
65 br i1 %exitcond, label %for.body, label %for.cond.for.end_crit_edge
67 for.cond.for.end_crit_edge:
68 %add.lcssa = phi i32 [ %add, %for.body ]
72 %s.0.lcssa = phi i32 [ %add.lcssa, %for.cond.for.end_crit_edge ], [ 0, %entry ]
76 ; %1 is partially redundant if %0 can be widened to a 64-bit load.
77 ; But we should not widen %0 to 64-bit load.
79 define i32 @overaligned_load(i32 %a, ptr nocapture %b) !dbg !13 {
80 ; CHECK-LABEL: @overaligned_load(
82 ; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[A:%.*]], 0, !dbg [[DBG14:![0-9]+]]
83 ; CHECK-NEXT: br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]], !dbg [[DBG14]]
85 ; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr @s1, align 8, !dbg [[DBG15:![0-9]+]], !tbaa [[TBAA9]]
86 ; CHECK-NEXT: br label [[IF_END:%.*]], !dbg [[DBG15]]
88 ; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, ptr [[B:%.*]], i64 2, !dbg [[DBG16:![0-9]+]]
89 ; CHECK-NEXT: store i32 10, ptr [[ARRAYIDX]], align 4, !dbg [[DBG16]], !tbaa [[TBAA9]]
90 ; CHECK-NEXT: br label [[IF_END]], !dbg [[DBG16]]
92 ; CHECK-NEXT: [[I_0:%.*]] = phi i32 [ [[TMP0]], [[IF_THEN]] ], [ 0, [[IF_ELSE]] ]
93 ; CHECK-NEXT: [[P_0:%.*]] = phi ptr [ @s1, [[IF_THEN]] ], [ [[B]], [[IF_ELSE]] ]
94 ; CHECK-NEXT: [[ADD_PTR:%.*]] = getelementptr inbounds i32, ptr [[P_0]], i64 1, !dbg [[DBG17:![0-9]+]]
95 ; CHECK-NEXT: [[TMP1:%.*]] = load i32, ptr [[ADD_PTR]], align 4, !dbg [[DBG17]], !tbaa [[TBAA9]]
96 ; CHECK-NEXT: [[ADD1:%.*]] = add nsw i32 [[TMP1]], [[I_0]], !dbg [[DBG17]]
97 ; CHECK-NEXT: ret i32 [[ADD1]], !dbg [[DBG17]]
100 %cmp = icmp sgt i32 %a, 0, !dbg !14
101 br i1 %cmp, label %if.then, label %if.else, !dbg !14
104 %0 = load i32, ptr @s1, align 8, !tbaa !5, !dbg !15
105 br label %if.end, !dbg !15
108 %arrayidx = getelementptr inbounds i32, ptr %b, i64 2, !dbg !16
109 store i32 10, ptr %arrayidx, align 4, !tbaa !5, !dbg !16
110 br label %if.end, !dbg !16
113 %i.0 = phi i32 [ %0, %if.then ], [ 0, %if.else ]
114 %p.0 = phi ptr [ @s1, %if.then ], [ %b, %if.else ]
115 %add.ptr = getelementptr inbounds i32, ptr %p.0, i64 1, !dbg !17
116 %1 = load i32, ptr %add.ptr, align 4, !tbaa !5, !dbg !17
117 %add1 = add nsw i32 %1, %i.0, !dbg !17
118 ret i32 %add1, !dbg !17
121 !1 = !{!2, !2, i64 0}
122 !2 = !{!"any pointer", !3, i64 0}
123 !3 = !{!"omnipotent char", !4, i64 0}
124 !4 = !{!"Simple C/C++ TBAA"}
125 !5 = !{!6, !6, i64 0}
126 !6 = !{!"int", !3, i64 0}
128 !llvm.module.flags = !{!7, !8, !9}
129 !llvm.dbg.cu = !{!18}
130 !7 = !{i32 2, !"Dwarf Version", i32 4}
131 !8 = !{i32 2, !"Debug Info Version", i32 3}
132 !9 = !{i32 1, !"PIC Level", i32 2}
135 !11 = !DISubroutineType(types: !10)
136 !12 = !DIFile(filename: "test.cpp", directory: "/tmp")
137 !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, retainedNodes: !10)
138 !14 = !DILocation(line: 100, column: 1, scope: !13)
139 !15 = !DILocation(line: 101, column: 1, scope: !13)
140 !16 = !DILocation(line: 102, column: 1, scope: !13)
141 !17 = !DILocation(line: 103, column: 1, scope: !13)
142 !18 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang",
144 isOptimized: true, flags: "-O2",
145 splitDebugFilename: "abc.debug", emissionKind: 2)