9d1b2acaaa
All SIMD architectures can emulate masked load/store/gather/scatter through element-wise condition check, scalar load/store, and insert/extract. Therefore, bailing out of vectorization as legality failure, when they return false, is incorrect. We should proceed to cost model and determine profitability. This patch is to address the vectorizer's architectural limitation described above. As such, I tried to keep the cost model and vectorize/don't-vectorize behavior nearly unchanged. Cost model tuning should be done separately. Please see http://lists.llvm.org/pipermail/llvm-dev/2018-January/120164.html for RFC and the discussions. Closes D43208. Patch by: Hideki Saito <hideki.saito@intel.com> llvm-svn: 326079
58 lines
2.7 KiB
LLVM
58 lines
2.7 KiB
LLVM
; RUN: opt < %s -enable-cond-stores-vec=false -loop-vectorize -S -pass-remarks-missed='loop-vectorize' -pass-remarks-analysis='loop-vectorize' 2>&1 | FileCheck %s
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; RUN: opt < %s -enable-cond-stores-vec=false -passes=loop-vectorize -S -pass-remarks-missed='loop-vectorize' -pass-remarks-analysis='loop-vectorize' 2>&1 | FileCheck %s
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; CHECK: remark: source.c:2:8: the cost-model indicates that vectorization is not beneficial
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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; Function Attrs: nounwind ssp uwtable
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define void @conditional_store(i32* noalias nocapture %indices) #0 !dbg !4 {
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entry:
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br label %for.body, !dbg !10
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for.body: ; preds = %for.inc, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.inc ]
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%arrayidx = getelementptr inbounds i32, i32* %indices, i64 %indvars.iv, !dbg !12
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%0 = load i32, i32* %arrayidx, align 4, !dbg !12, !tbaa !14
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%cmp1 = icmp eq i32 %0, 1024, !dbg !12
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br i1 %cmp1, label %if.then, label %for.inc, !dbg !12
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if.then: ; preds = %for.body
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store i32 0, i32* %arrayidx, align 4, !dbg !18, !tbaa !14
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br label %for.inc, !dbg !18
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for.inc: ; preds = %for.body, %if.then
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !10
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%exitcond = icmp eq i64 %indvars.iv.next, 4096, !dbg !10
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br i1 %exitcond, label %for.end, label %for.body, !dbg !10
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for.end: ; preds = %for.inc
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ret void, !dbg !19
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}
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attributes #0 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8}
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!llvm.ident = !{!9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0", isOptimized: true, emissionKind: LineTablesOnly, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "source.c", directory: ".")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "conditional_store", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "source.c", directory: ".")
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!6 = !DISubroutineType(types: !2)
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!7 = !{i32 2, !"Dwarf Version", i32 2}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{!"clang version 3.6.0"}
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!10 = !DILocation(line: 2, column: 8, scope: !11)
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!11 = distinct !DILexicalBlock(line: 2, column: 3, file: !1, scope: !4)
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!12 = !DILocation(line: 3, column: 9, scope: !13)
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!13 = distinct !DILexicalBlock(line: 3, column: 9, file: !1, scope: !11)
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!14 = !{!15, !15, i64 0}
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!15 = !{!"int", !16, i64 0}
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!16 = !{!"omnipotent char", !17, i64 0}
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!17 = !{!"Simple C/C++ TBAA"}
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!18 = !DILocation(line: 3, column: 29, scope: !13)
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!19 = !DILocation(line: 4, column: 1, scope: !4)
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