53 lines
1.9 KiB
LLVM
53 lines
1.9 KiB
LLVM
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; RUN: opt -newgvn -S < %s | FileCheck %s
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; Check that the redundant load from %if.then is removed.
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; Also, check that the debug location associated to load %0 still refers to
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; line 3 and not line 6.
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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; CHECK: @test_redundant_load(
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; CHECK-LABEL: entry:
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; CHECK-NEXT: load i32, i32* %Y, align 4, !dbg ![[LOC:[0-9]+]]
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; CHECK-LABEL: if.then:
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; CHECK-NOT: load
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; CHECK-LABEL: if.end:
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; CHECK: ![[LOC]] = !DILocation(line: 3, scope: !{{.*}})
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define i32 @test_redundant_load(i32 %X, i32* %Y) !dbg !6 {
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entry:
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%0 = load i32, i32* %Y, align 4, !dbg !8
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%cmp = icmp sgt i32 %X, -1, !dbg !9
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br i1 %cmp, label %if.then, label %if.end, !dbg !9
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if.then: ; preds = %entry
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%1 = load i32, i32* %Y, align 4, !dbg !10
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%add = add nsw i32 %0, %1, !dbg !10
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call void @foo(), !dbg !11
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br label %if.end, !dbg !12
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if.end: ; preds = %if.then, %entry
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%Result.0 = phi i32 [ %add, %if.then ], [ %0, %entry ]
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ret i32 %Result.0, !dbg !13
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}
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declare void @foo()
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2)
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!1 = !DIFile(filename: "test.cpp", directory: "")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"PIC Level", i32 2}
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!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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!7 = !DISubroutineType(types: !2)
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!8 = !DILocation(line: 3, scope: !6)
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!9 = !DILocation(line: 5, scope: !6)
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!10 = !DILocation(line: 6, scope: !6)
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!11 = !DILocation(line: 7, scope: !6)
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!12 = !DILocation(line: 8, scope: !6)
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!13 = !DILocation(line: 10, scope: !6)
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