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121
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1 ; RUN: opt -instcombine -S %s | FileCheck %s
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2
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3 ; Make sure we collapse the fences in this case
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4
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5 ; CHECK-LABEL: define void @tinkywinky
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6 ; CHECK-NEXT: fence seq_cst
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7 ; CHECK-NEXT: fence syncscope("singlethread") acquire
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8 ; CHECK-NEXT: ret void
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9 ; CHECK-NEXT: }
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10
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11 define void @tinkywinky() {
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12 fence seq_cst
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13 fence seq_cst
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14 fence seq_cst
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15 fence syncscope("singlethread") acquire
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16 fence syncscope("singlethread") acquire
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17 fence syncscope("singlethread") acquire
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18 ret void
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19 }
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20
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21 ; CHECK-LABEL: define void @dipsy
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22 ; CHECK-NEXT: fence seq_cst
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23 ; CHECK-NEXT: fence syncscope("singlethread") seq_cst
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24 ; CHECK-NEXT: ret void
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25 ; CHECK-NEXT: }
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26
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27 define void @dipsy() {
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28 fence seq_cst
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29 fence syncscope("singlethread") seq_cst
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30 ret void
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31 }
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32
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33 ; CHECK-LABEL: define void @patatino
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34 ; CHECK-NEXT: fence acquire
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35 ; CHECK-NEXT: fence seq_cst
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36 ; CHECK-NEXT: fence acquire
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37 ; CHECK-NEXT: fence seq_cst
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38 ; CHECK-NEXT: ret void
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39 ; CHECK-NEXT: }
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40
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41 define void @patatino() {
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42 fence acquire
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43 fence seq_cst
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44 fence acquire
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45 fence seq_cst
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46 ret void
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47 }
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147
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48
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49 ; CHECK-LABEL: define void @debug
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50 ; CHECK-NOT: fence
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51 ; CHECK: call void @llvm.dbg.value
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52 ; CHECK: fence seq_cst
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53 define void @debug() {
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54 fence seq_cst
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55 tail call void @llvm.dbg.value(metadata i32 5, metadata !1, metadata !DIExpression()), !dbg !9
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56 fence seq_cst
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57 ret void
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58 }
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59
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60 declare void @llvm.dbg.value(metadata, metadata, metadata)
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61
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62 !llvm.dbg.cu = !{!0}
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63 !llvm.module.flags = !{!5, !6, !7, !8}
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64
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65 !0 = distinct !DICompileUnit(language: DW_LANG_C, file: !3, producer: "Me", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: null, retainedTypes: null, imports: null)
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66 !1 = !DILocalVariable(name: "", arg: 1, scope: !2, file: null, line: 1, type: null)
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67 !2 = distinct !DISubprogram(name: "debug", linkageName: "debug", scope: null, file: null, line: 0, type: null, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0)
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68 !3 = !DIFile(filename: "consecutive-fences.ll", directory: "")
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69 !5 = !{i32 2, !"Dwarf Version", i32 4}
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70 !6 = !{i32 2, !"Debug Info Version", i32 3}
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71 !7 = !{i32 1, !"wchar_size", i32 4}
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72 !8 = !{i32 7, !"PIC Level", i32 2}
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73 !9 = !DILocation(line: 0, column: 0, scope: !2)
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