| ; RUN: opt -S -passes=dse < %s | FileCheck %s |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| |
| ; This test is not relevant for DSE with MemorySSA. Non-memory instructions |
| ; are ignored anyways. The limits for the MemorySSA traversal are tested in |
| ; llvm/test/Transforms/DeadStoreElimination/MSSA/memoryssa-scan-limit.ll |
| |
| @x = global i32 0, align 4 |
| |
| ; Function Attrs: nounwind |
| define i32 @test_within_limit() !dbg !4 { |
| entry: |
| ; The first store; later there is a second store to the same location, |
| ; so this store should be optimized away by DSE. |
| ; CHECK-NOT: store i32 1, ptr @x, align 4 |
| store i32 1, ptr @x, align 4 |
| |
| ; Insert 98 dummy instructions between the two stores |
| %0 = bitcast i32 0 to i32 |
| %1 = bitcast i32 0 to i32 |
| %2 = bitcast i32 0 to i32 |
| %3 = bitcast i32 0 to i32 |
| %4 = bitcast i32 0 to i32 |
| %5 = bitcast i32 0 to i32 |
| %6 = bitcast i32 0 to i32 |
| %7 = bitcast i32 0 to i32 |
| %8 = bitcast i32 0 to i32 |
| %9 = bitcast i32 0 to i32 |
| %10 = bitcast i32 0 to i32 |
| %11 = bitcast i32 0 to i32 |
| %12 = bitcast i32 0 to i32 |
| %13 = bitcast i32 0 to i32 |
| %14 = bitcast i32 0 to i32 |
| %15 = bitcast i32 0 to i32 |
| %16 = bitcast i32 0 to i32 |
| %17 = bitcast i32 0 to i32 |
| %18 = bitcast i32 0 to i32 |
| %19 = bitcast i32 0 to i32 |
| %20 = bitcast i32 0 to i32 |
| %21 = bitcast i32 0 to i32 |
| %22 = bitcast i32 0 to i32 |
| %23 = bitcast i32 0 to i32 |
| %24 = bitcast i32 0 to i32 |
| %25 = bitcast i32 0 to i32 |
| %26 = bitcast i32 0 to i32 |
| %27 = bitcast i32 0 to i32 |
| %28 = bitcast i32 0 to i32 |
| %29 = bitcast i32 0 to i32 |
| %30 = bitcast i32 0 to i32 |
| %31 = bitcast i32 0 to i32 |
| %32 = bitcast i32 0 to i32 |
| %33 = bitcast i32 0 to i32 |
| %34 = bitcast i32 0 to i32 |
| %35 = bitcast i32 0 to i32 |
| %36 = bitcast i32 0 to i32 |
| %37 = bitcast i32 0 to i32 |
| %38 = bitcast i32 0 to i32 |
| %39 = bitcast i32 0 to i32 |
| %40 = bitcast i32 0 to i32 |
| %41 = bitcast i32 0 to i32 |
| %42 = bitcast i32 0 to i32 |
| %43 = bitcast i32 0 to i32 |
| %44 = bitcast i32 0 to i32 |
| %45 = bitcast i32 0 to i32 |
| %46 = bitcast i32 0 to i32 |
| %47 = bitcast i32 0 to i32 |
| %48 = bitcast i32 0 to i32 |
| %49 = bitcast i32 0 to i32 |
| %50 = bitcast i32 0 to i32 |
| %51 = bitcast i32 0 to i32 |
| %52 = bitcast i32 0 to i32 |
| %53 = bitcast i32 0 to i32 |
| %54 = bitcast i32 0 to i32 |
| %55 = bitcast i32 0 to i32 |
| %56 = bitcast i32 0 to i32 |
| %57 = bitcast i32 0 to i32 |
| %58 = bitcast i32 0 to i32 |
| %59 = bitcast i32 0 to i32 |
| %60 = bitcast i32 0 to i32 |
| %61 = bitcast i32 0 to i32 |
| %62 = bitcast i32 0 to i32 |
| %63 = bitcast i32 0 to i32 |
| %64 = bitcast i32 0 to i32 |
| %65 = bitcast i32 0 to i32 |
| %66 = bitcast i32 0 to i32 |
| %67 = bitcast i32 0 to i32 |
| %68 = bitcast i32 0 to i32 |
| %69 = bitcast i32 0 to i32 |
| %70 = bitcast i32 0 to i32 |
| %71 = bitcast i32 0 to i32 |
| %72 = bitcast i32 0 to i32 |
| %73 = bitcast i32 0 to i32 |
| %74 = bitcast i32 0 to i32 |
| %75 = bitcast i32 0 to i32 |
| %76 = bitcast i32 0 to i32 |
| %77 = bitcast i32 0 to i32 |
| %78 = bitcast i32 0 to i32 |
| %79 = bitcast i32 0 to i32 |
| %80 = bitcast i32 0 to i32 |
| %81 = bitcast i32 0 to i32 |
| %82 = bitcast i32 0 to i32 |
| %83 = bitcast i32 0 to i32 |
| %84 = bitcast i32 0 to i32 |
| %85 = bitcast i32 0 to i32 |
| %86 = bitcast i32 0 to i32 |
| %87 = bitcast i32 0 to i32 |
| %88 = bitcast i32 0 to i32 |
| %89 = bitcast i32 0 to i32 |
| %90 = bitcast i32 0 to i32 |
| %91 = bitcast i32 0 to i32 |
| %92 = bitcast i32 0 to i32 |
| %93 = bitcast i32 0 to i32 |
| %94 = bitcast i32 0 to i32 |
| %95 = bitcast i32 0 to i32 |
| %96 = bitcast i32 0 to i32 |
| %97 = bitcast i32 0 to i32 |
| |
| ; Insert a meaningless dbg.value intrinsic; it should have no |
| ; effect on the working of DSE in any way. |
| call void @llvm.dbg.value(metadata i32 undef, metadata !10, metadata !DIExpression()), !dbg !DILocation(scope: !4) |
| |
| ; CHECK: store i32 -1, ptr @x, align 4 |
| store i32 -1, ptr @x, align 4 |
| ret i32 0 |
| } |
| |
| ; Function Attrs: nounwind |
| define i32 @test_outside_limit() { |
| entry: |
| ; The first store; later there is a second store to the same location |
| ; CHECK-NOT: store i32 1, ptr @x, align 4 |
| store i32 1, ptr @x, align 4 |
| |
| ; Insert 99 dummy instructions between the two stores; this is |
| ; one too many instruction for the DSE to take place. |
| %0 = bitcast i32 0 to i32 |
| %1 = bitcast i32 0 to i32 |
| %2 = bitcast i32 0 to i32 |
| %3 = bitcast i32 0 to i32 |
| %4 = bitcast i32 0 to i32 |
| %5 = bitcast i32 0 to i32 |
| %6 = bitcast i32 0 to i32 |
| %7 = bitcast i32 0 to i32 |
| %8 = bitcast i32 0 to i32 |
| %9 = bitcast i32 0 to i32 |
| %10 = bitcast i32 0 to i32 |
| %11 = bitcast i32 0 to i32 |
| %12 = bitcast i32 0 to i32 |
| %13 = bitcast i32 0 to i32 |
| %14 = bitcast i32 0 to i32 |
| %15 = bitcast i32 0 to i32 |
| %16 = bitcast i32 0 to i32 |
| %17 = bitcast i32 0 to i32 |
| %18 = bitcast i32 0 to i32 |
| %19 = bitcast i32 0 to i32 |
| %20 = bitcast i32 0 to i32 |
| %21 = bitcast i32 0 to i32 |
| %22 = bitcast i32 0 to i32 |
| %23 = bitcast i32 0 to i32 |
| %24 = bitcast i32 0 to i32 |
| %25 = bitcast i32 0 to i32 |
| %26 = bitcast i32 0 to i32 |
| %27 = bitcast i32 0 to i32 |
| %28 = bitcast i32 0 to i32 |
| %29 = bitcast i32 0 to i32 |
| %30 = bitcast i32 0 to i32 |
| %31 = bitcast i32 0 to i32 |
| %32 = bitcast i32 0 to i32 |
| %33 = bitcast i32 0 to i32 |
| %34 = bitcast i32 0 to i32 |
| %35 = bitcast i32 0 to i32 |
| %36 = bitcast i32 0 to i32 |
| %37 = bitcast i32 0 to i32 |
| %38 = bitcast i32 0 to i32 |
| %39 = bitcast i32 0 to i32 |
| %40 = bitcast i32 0 to i32 |
| %41 = bitcast i32 0 to i32 |
| %42 = bitcast i32 0 to i32 |
| %43 = bitcast i32 0 to i32 |
| %44 = bitcast i32 0 to i32 |
| %45 = bitcast i32 0 to i32 |
| %46 = bitcast i32 0 to i32 |
| %47 = bitcast i32 0 to i32 |
| %48 = bitcast i32 0 to i32 |
| %49 = bitcast i32 0 to i32 |
| %50 = bitcast i32 0 to i32 |
| %51 = bitcast i32 0 to i32 |
| %52 = bitcast i32 0 to i32 |
| %53 = bitcast i32 0 to i32 |
| %54 = bitcast i32 0 to i32 |
| %55 = bitcast i32 0 to i32 |
| %56 = bitcast i32 0 to i32 |
| %57 = bitcast i32 0 to i32 |
| %58 = bitcast i32 0 to i32 |
| %59 = bitcast i32 0 to i32 |
| %60 = bitcast i32 0 to i32 |
| %61 = bitcast i32 0 to i32 |
| %62 = bitcast i32 0 to i32 |
| %63 = bitcast i32 0 to i32 |
| %64 = bitcast i32 0 to i32 |
| %65 = bitcast i32 0 to i32 |
| %66 = bitcast i32 0 to i32 |
| %67 = bitcast i32 0 to i32 |
| %68 = bitcast i32 0 to i32 |
| %69 = bitcast i32 0 to i32 |
| %70 = bitcast i32 0 to i32 |
| %71 = bitcast i32 0 to i32 |
| %72 = bitcast i32 0 to i32 |
| %73 = bitcast i32 0 to i32 |
| %74 = bitcast i32 0 to i32 |
| %75 = bitcast i32 0 to i32 |
| %76 = bitcast i32 0 to i32 |
| %77 = bitcast i32 0 to i32 |
| %78 = bitcast i32 0 to i32 |
| %79 = bitcast i32 0 to i32 |
| %80 = bitcast i32 0 to i32 |
| %81 = bitcast i32 0 to i32 |
| %82 = bitcast i32 0 to i32 |
| %83 = bitcast i32 0 to i32 |
| %84 = bitcast i32 0 to i32 |
| %85 = bitcast i32 0 to i32 |
| %86 = bitcast i32 0 to i32 |
| %87 = bitcast i32 0 to i32 |
| %88 = bitcast i32 0 to i32 |
| %89 = bitcast i32 0 to i32 |
| %90 = bitcast i32 0 to i32 |
| %91 = bitcast i32 0 to i32 |
| %92 = bitcast i32 0 to i32 |
| %93 = bitcast i32 0 to i32 |
| %94 = bitcast i32 0 to i32 |
| %95 = bitcast i32 0 to i32 |
| %96 = bitcast i32 0 to i32 |
| %97 = bitcast i32 0 to i32 |
| %98 = bitcast i32 0 to i32 |
| |
| ; CHECK: store i32 -1, ptr @x, align 4 |
| store i32 -1, ptr @x, align 4 |
| ret i32 0 |
| } |
| |
| ; Function Attrs: nounwind readnone |
| declare void @llvm.dbg.value(metadata, metadata, metadata) |
| |
| !llvm.dbg.cu = !{!0} |
| !llvm.module.flags = !{!11, !13} |
| |
| !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2) |
| !1 = !DIFile(filename: "test.c", directory: "/home/tmp") |
| !2 = !{} |
| !4 = distinct !DISubprogram(name: "test_within_limit", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 4, file: !1, scope: !5, type: !6, retainedNodes: !2) |
| !5 = !DIFile(filename: "test.c", directory: "/home/tmp") |
| !6 = !DISubroutineType(types: !7) |
| !7 = !{!8} |
| !8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) |
| !9 = !{!10} |
| !10 = !DILocalVariable(name: "x", scope: !4, type: !8) |
| !11 = !{i32 2, !"Dwarf Version", i32 4} |
| !12 = !{ptr undef} |
| |
| !13 = !{i32 1, !"Debug Info Version", i32 3} |