84 lines
2.9 KiB
LLVM
84 lines
2.9 KiB
LLVM
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; RUN: opt -mem2reg -instcombine %s -o - -S | FileCheck %s
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;
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; Test that a dbg.declare describing am alloca with volatile
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; load/stores is not lowered into a dbg.value, since the alloca won't
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; be elided anyway.
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;
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; Generated from:
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;
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; unsigned long long g();
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; void h(unsigned long long);
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; void f() {
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; volatile unsigned long long v = g();
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; if (v == 0)
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; g();
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; h(v);
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; }
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; CHECK: alloca i64
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; CHECK-NOT: call void @llvm.dbg.value
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; CHECK: call void @llvm.dbg.declare
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; CHECK-NOT: call void @llvm.dbg.value
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source_filename = "volatile.c"
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; Function Attrs: nounwind optsize ssp uwtable
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define void @f() local_unnamed_addr #0 !dbg !8 {
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%1 = alloca i64, align 8
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%2 = bitcast i64* %1 to i8*, !dbg !15
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call void @llvm.lifetime.start.p0i8(i64 8, i8* %2), !dbg !15
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call void @llvm.dbg.declare(metadata i64* %1, metadata !12, metadata !DIExpression()), !dbg !15
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%3 = call i64 (...) @g() #4, !dbg !15
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store volatile i64 %3, i64* %1, align 8, !dbg !15
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%4 = load volatile i64, i64* %1, align 8, !dbg !15
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%5 = icmp eq i64 %4, 0, !dbg !15
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br i1 %5, label %6, label %8, !dbg !15
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; <label>:6: ; preds = %0
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%7 = call i64 (...) @g() #4, !dbg !15
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br label %8, !dbg !15
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; <label>:8: ; preds = %6, %0
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%9 = load volatile i64, i64* %1, align 8, !dbg !15
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call void @h(i64 %9) #4, !dbg !15
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call void @llvm.lifetime.end.p0i8(i64 8, i8* %2), !dbg !15
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ret void, !dbg !15
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}
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
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; Function Attrs: optsize
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declare i64 @g(...) local_unnamed_addr #3
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; Function Attrs: optsize
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declare void @h(i64) local_unnamed_addr #3
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
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attributes #0 = { nounwind optsize ssp uwtable }
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attributes #1 = { argmemonly nounwind }
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attributes #2 = { nounwind readnone speculatable }
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attributes #3 = { optsize }
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attributes #4 = { optsize }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
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!1 = !DIFile(filename: "volatile.c", directory: "/")
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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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!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)
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!9 = !DISubroutineType(types: !10)
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!10 = !{null}
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!11 = !{!12}
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!12 = !DILocalVariable(name: "v", scope: !8, file: !1, line: 4, type: !13)
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!13 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !14)
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!14 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)
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!15 = !DILocation(line: 4, column: 3, scope: !8)
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