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These are interesting because lack of precision in alias information could be standing in the way of this optimization. An example is the case in the test suite that I showed in the DevMeeting talk: http://lab.llvm.org:8080/artifacts/opt-view_test-suite/build/MultiSource/Benchmarks/FreeBench/distray/CMakeFiles/distray.dir/html/_org_test-suite_MultiSource_Benchmarks_FreeBench_distray_distray.c.html#L236 canSinkOrHoistInst is also used from LoopSink, which does not use opt-remarks so we need to take ORE as an optional argument. Differential Revision: https://reviews.llvm.org/D27939 llvm-svn: 291648
68 lines
2.3 KiB
LLVM
68 lines
2.3 KiB
LLVM
; RUN: opt < %s -licm -pass-remarks-missed=licm -o /dev/null 2>&1 | FileCheck %s
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; RUN: opt -aa-pipeline=basic-aa -passes='require<aa>,require<targetir>,require<scalar-evolution>,require<opt-remark-emit>,loop(licm)' %s -o /dev/null -pass-remarks-missed=licm 2>&1 | FileCheck %s
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target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
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; Without the noalias on %p, we can't optmize this and the remark should tell
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; us about it.
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define void @test(i32* %array, i32* %p) {
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Entry:
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br label %Loop
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Loop:
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%j = phi i32 [ 0, %Entry ], [ %Next, %Loop ]
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%addr = getelementptr i32, i32* %array, i32 %j
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%a = load i32, i32* %addr
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; CHECK: remark: /tmp/kk.c:2:20: failed to move load with loop-invariant address because the loop may invalidate its value
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%b = load i32, i32* %p, !dbg !8
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%a2 = add i32 %a, %b
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store i32 %a2, i32* %addr
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%Next = add i32 %j, 1
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%cond = icmp eq i32 %Next, 0
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br i1 %cond, label %Out, label %Loop
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Out:
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ret void
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}
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; This illustrates why we need to check loop-invariance before issuing this
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; remark.
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define i32 @invalidated_load_with_non_loop_invariant_address(i32* %array, i32* %array2) {
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Entry:
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br label %Loop
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Loop:
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%j = phi i32 [ 0, %Entry ], [ %Next, %Loop ]
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; CHECK-NOT: /tmp/kk.c:3:20: {{.*}} loop-invariant
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%addr = getelementptr i32, i32* %array, i32 %j
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%a = load i32, i32* %addr, !dbg !9
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%addr2 = getelementptr i32, i32* %array2, i32 %j
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store i32 %j, i32* %addr2
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%Next = add i32 %j, 1
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%cond = icmp eq i32 %Next, 0
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br i1 %cond, label %Out, label %Loop
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Out:
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%a2 = phi i32 [ %a, %Loop ]
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ret i32 %a2
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: NoDebug, enums: !2)
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!1 = !DIFile(filename: "/tmp/kk.c", directory: "/tmp")
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!2 = !{}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!4 = !{i32 1, !"PIC Level", i32 2}
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!5 = !{!"clang version 3.9.0 "}
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!6 = distinct !DISubprogram(name: "success", scope: !1, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !2)
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!7 = !DISubroutineType(types: !2)
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!8 = !DILocation(line: 2, column: 20, scope: !6)
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!9 = !DILocation(line: 3, column: 20, scope: !6)
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