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150
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1 ; RUN: opt -gvn -S < %s | FileCheck %s
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2
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3 ; Check that the redundant load from %if.then is removed.
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4 ; Also, check that the debug location associated to load %0 still refers to
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5 ; line 3 and not line 6.
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6
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7 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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8
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9 ; CHECK: @test_redundant_load(
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10 ; CHECK-LABEL: entry:
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11 ; CHECK-NEXT: load i32, i32* %Y, align 4, !dbg ![[LOC:[0-9]+]]
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12 ; CHECK-LABEL: if.then:
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13 ; CHECK-NOT: load
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14 ; CHECK-LABEL: if.end:
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15 ; CHECK: ![[LOC]] = !DILocation(line: 3, scope: !{{.*}})
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16
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17 define i32 @test_redundant_load(i32 %X, i32* %Y) !dbg !6 {
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18 entry:
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19 %0 = load i32, i32* %Y, align 4, !dbg !8
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20 %cmp = icmp sgt i32 %X, -1, !dbg !9
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21 br i1 %cmp, label %if.then, label %if.end, !dbg !9
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22
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23 if.then: ; preds = %entry
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24 %1 = load i32, i32* %Y, align 4, !dbg !10
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25 %add = add nsw i32 %0, %1, !dbg !10
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26 call void @foo(), !dbg !11
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27 br label %if.end, !dbg !12
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28
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29 if.end: ; preds = %if.then, %entry
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30 %Result.0 = phi i32 [ %add, %if.then ], [ %0, %entry ]
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31 ret i32 %Result.0, !dbg !13
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32 }
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33
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34 declare void @foo()
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35
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36 !llvm.dbg.cu = !{!0}
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37 !llvm.module.flags = !{!3, !4, !5}
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38
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39 !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2)
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40 !1 = !DIFile(filename: "test.cpp", directory: "")
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41 !2 = !{}
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42 !3 = !{i32 2, !"Dwarf Version", i32 4}
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43 !4 = !{i32 2, !"Debug Info Version", i32 3}
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44 !5 = !{i32 1, !"PIC Level", i32 2}
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45 !6 = distinct !DISubprogram(name: "test_redundant_load", scope: !1, file: !1, line: 2, type: !7, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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46 !7 = !DISubroutineType(types: !2)
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47 !8 = !DILocation(line: 3, scope: !6)
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48 !9 = !DILocation(line: 5, scope: !6)
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49 !10 = !DILocation(line: 6, scope: !6)
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50 !11 = !DILocation(line: 7, scope: !6)
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51 !12 = !DILocation(line: 8, scope: !6)
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52 !13 = !DILocation(line: 10, scope: !6)
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