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      1 ; RUN: opt %s -O2 -S -o - | FileCheck %s
      2 ; Verify that we emit the same intrinsic at most once.
      3 ; rdar://problem/13056109
      4 ;
      5 ; CHECK: call void @llvm.dbg.value(metadata %struct.i14** %p
      6 ; CHECK-NOT: call void @llvm.dbg.value(metadata %struct.i14** %p
      7 ; CHECK-NEXT: call i32 @foo
      8 ; CHECK: ret
      9 ;
     10 ;
     11 ; typedef struct {
     12 ;   long i;
     13 ; } i14;
     14 ;
     15 ; int foo(i14**);
     16 ;
     17 ;   void init() {
     18 ;     i14* p = 0;
     19 ;     foo(&p);
     20 ;     p->i |= 4;
     21 ;     foo(&p);
     22 ;   }
     23 ;
     24 ; ModuleID = 'instcombine_intrinsics.c'
     25 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
     26 target triple = "x86_64-apple-macosx10.9.0"
     27 
     28 %struct.i14 = type { i64 }
     29 
     30 ; Function Attrs: nounwind ssp uwtable
     31 define void @init() #0 !dbg !4 {
     32   %p = alloca %struct.i14*, align 8
     33   call void @llvm.dbg.declare(metadata %struct.i14** %p, metadata !11, metadata !DIExpression()), !dbg !18
     34   store %struct.i14* null, %struct.i14** %p, align 8, !dbg !18
     35   %1 = call i32 @foo(%struct.i14** %p), !dbg !19
     36   %2 = load %struct.i14*, %struct.i14** %p, align 8, !dbg !20
     37   %3 = getelementptr inbounds %struct.i14, %struct.i14* %2, i32 0, i32 0, !dbg !20
     38   %4 = load i64, i64* %3, align 8, !dbg !20
     39   %5 = or i64 %4, 4, !dbg !20
     40   store i64 %5, i64* %3, align 8, !dbg !20
     41   %6 = call i32 @foo(%struct.i14** %p), !dbg !21
     42   ret void, !dbg !22
     43 }
     44 
     45 ; Function Attrs: nounwind readnone
     46 declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
     47 
     48 declare i32 @foo(%struct.i14**)
     49 
     50 attributes #0 = { nounwind ssp uwtable }
     51 attributes #1 = { nounwind readnone }
     52 
     53 !llvm.dbg.cu = !{!0}
     54 !llvm.module.flags = !{!8, !9}
     55 !llvm.ident = !{!10}
     56 
     57 !0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
     58 !1 = !DIFile(filename: "instcombine_intrinsics.c", directory: "")
     59 !2 = !{}
     60 !4 = distinct !DISubprogram(name: "init", line: 7, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !0, scopeLine: 7, file: !1, scope: !5, type: !6, variables: !2)
     61 !5 = !DIFile(filename: "instcombine_intrinsics.c", directory: "")
     62 !6 = !DISubroutineType(types: !7)
     63 !7 = !{null}
     64 !8 = !{i32 2, !"Dwarf Version", i32 2}
     65 !9 = !{i32 1, !"Debug Info Version", i32 3}
     66 !10 = !{!"clang version 3.5.0 "}
     67 !11 = !DILocalVariable(name: "p", line: 8, scope: !4, file: !5, type: !12)
     68 !12 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !13)
     69 !13 = !DIDerivedType(tag: DW_TAG_typedef, name: "i14", line: 3, file: !1, baseType: !14)
     70 !14 = !DICompositeType(tag: DW_TAG_structure_type, line: 1, size: 64, align: 64, file: !1, elements: !15)
     71 !15 = !{!16}
     72 !16 = !DIDerivedType(tag: DW_TAG_member, name: "i", line: 2, size: 64, align: 64, file: !1, scope: !14, baseType: !17)
     73 !17 = !DIBasicType(tag: DW_TAG_base_type, name: "long int", size: 64, align: 64, encoding: DW_ATE_signed)
     74 !18 = !DILocation(line: 8, scope: !4)
     75 !19 = !DILocation(line: 9, scope: !4)
     76 !20 = !DILocation(line: 10, scope: !4)
     77 !21 = !DILocation(line: 11, scope: !4)
     78 !22 = !DILocation(line: 12, scope: !4)
     79