1 ; RUN: opt -mem2reg -instcombine %s -o - -S | FileCheck %s 2 ; 3 ; Test that a dbg.declare describing am alloca with volatile 4 ; load/stores is not lowered into a dbg.value, since the alloca won't 5 ; be elided anyway. 6 ; 7 ; Generated from: 8 ; 9 ; unsigned long long g(); 10 ; void h(unsigned long long); 11 ; void f() { 12 ; volatile unsigned long long v = g(); 13 ; if (v == 0) 14 ; g(); 15 ; h(v); 16 ; } 17 18 ; CHECK: alloca i64 19 ; CHECK-NOT: call void @llvm.dbg.value 20 ; CHECK: call void @llvm.dbg.declare 21 ; CHECK-NOT: call void @llvm.dbg.value 22 23 source_filename = "volatile.c" 24 25 ; Function Attrs: nounwind optsize ssp uwtable 26 define void @f() local_unnamed_addr #0 !dbg !8 { 27 %1 = alloca i64, align 8 28 %2 = bitcast i64* %1 to i8*, !dbg !15 29 call void @llvm.lifetime.start.p0i8(i64 8, i8* %2), !dbg !15 30 call void @llvm.dbg.declare(metadata i64* %1, metadata !12, metadata !DIExpression()), !dbg !15 31 %3 = call i64 (...) @g() #4, !dbg !15 32 store volatile i64 %3, i64* %1, align 8, !dbg !15 33 %4 = load volatile i64, i64* %1, align 8, !dbg !15 34 %5 = icmp eq i64 %4, 0, !dbg !15 35 br i1 %5, label %6, label %8, !dbg !15 36 37 ; <label>:6: ; preds = %0 38 %7 = call i64 (...) @g() #4, !dbg !15 39 br label %8, !dbg !15 40 41 ; <label>:8: ; preds = %6, %0 42 %9 = load volatile i64, i64* %1, align 8, !dbg !15 43 call void @h(i64 %9) #4, !dbg !15 44 call void @llvm.lifetime.end.p0i8(i64 8, i8* %2), !dbg !15 45 ret void, !dbg !15 46 } 47 48 ; Function Attrs: argmemonly nounwind 49 declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1 50 51 ; Function Attrs: nounwind readnone speculatable 52 declare void @llvm.dbg.declare(metadata, metadata, metadata) #2 53 54 ; Function Attrs: optsize 55 declare i64 @g(...) local_unnamed_addr #3 56 57 ; Function Attrs: optsize 58 declare void @h(i64) local_unnamed_addr #3 59 60 ; Function Attrs: argmemonly nounwind 61 declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1 62 63 attributes #0 = { nounwind optsize ssp uwtable } 64 attributes #1 = { argmemonly nounwind } 65 attributes #2 = { nounwind readnone speculatable } 66 attributes #3 = { optsize } 67 attributes #4 = { optsize } 68 69 !llvm.dbg.cu = !{!0} 70 !llvm.module.flags = !{!3, !4} 71 72 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug) 73 !1 = !DIFile(filename: "volatile.c", directory: "/") 74 !3 = !{i32 2, !"Dwarf Version", i32 4} 75 !4 = !{i32 2, !"Debug Info Version", i32 3} 76 !8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 3, type: !9, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !0, retainedNodes: !11) 77 !9 = !DISubroutineType(types: !10) 78 !10 = !{null} 79 !11 = !{!12} 80 !12 = !DILocalVariable(name: "v", scope: !8, file: !1, line: 4, type: !13) 81 !13 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !14) 82 !14 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned) 83 !15 = !DILocation(line: 4, column: 3, scope: !8) 84
