c1c5b854ad
A set of microbenchmarks (https://github.com/llvm/llvm-test-suite/pull/26) showed that loop interleaving can be beneficial for loops with low trip count as well. Loop interleaving count computation is updated accordingly in prior patches while this patch removes the loop trip count threshold for interleaving.
74 lines
3.7 KiB
LLVM
74 lines
3.7 KiB
LLVM
; RUN: opt < %s -passes=loop-vectorize -mtriple=x86_64-unknown-linux -S -pass-remarks='loop-vectorize' 2>&1 | FileCheck -check-prefix=VECTORIZED %s
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; RUN: opt < %s -passes=loop-vectorize -force-vector-width=1 -force-vector-interleave=4 -mtriple=x86_64-unknown-linux -S -pass-remarks='loop-vectorize' 2>&1 | FileCheck -check-prefix=UNROLLED %s
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; RUN: opt < %s -passes=loop-vectorize -force-vector-width=1 -force-vector-interleave=1 -mtriple=x86_64-unknown-linux -S -pass-remarks-analysis='loop-vectorize' 2>&1 | FileCheck -check-prefix=NONE %s
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; RUN: llc < %s -mtriple x86_64-pc-linux-gnu -o - | FileCheck -check-prefix=DEBUG-OUTPUT %s
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; DEBUG-OUTPUT-NOT: .loc
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; DEBUG-OUTPUT-NOT: {{.*}}.debug_info
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; VECTORIZED: remark: vectorization-remarks.c:17:8: vectorized loop (vectorization width: 4, interleaved count: 2)
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; UNROLLED: remark: vectorization-remarks.c:17:8: interleaved loop (interleaved count: 4)
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; NONE: remark: vectorization-remarks.c:17:8: loop not vectorized: vectorization and interleaving are explicitly disabled, or the loop has already been vectorized
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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define i32 @foo(i32 %n) #0 !dbg !4 {
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entry:
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%diff = alloca i32, align 4
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%cb = alloca [16 x i8], align 16
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%cc = alloca [16 x i8], align 16
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store i32 0, ptr %diff, align 4, !dbg !10, !tbaa !11
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br label %for.body, !dbg !15
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%add8 = phi i32 [ 0, %entry ], [ %add, %for.body ], !dbg !19
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%arrayidx = getelementptr inbounds [16 x i8], ptr %cb, i64 0, i64 %indvars.iv, !dbg !19
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%0 = load i8, ptr %arrayidx, align 1, !dbg !19, !tbaa !21
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%conv = sext i8 %0 to i32, !dbg !19
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%arrayidx2 = getelementptr inbounds [16 x i8], ptr %cc, i64 0, i64 %indvars.iv, !dbg !19
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%1 = load i8, ptr %arrayidx2, align 1, !dbg !19, !tbaa !21
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%conv3 = sext i8 %1 to i32, !dbg !19
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%sub = sub i32 %conv, %conv3, !dbg !19
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%add = add nsw i32 %sub, %add8, !dbg !19
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !15
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%exitcond = icmp eq i64 %indvars.iv.next, 16, !dbg !15
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br i1 %exitcond, label %for.end, label %for.body, !dbg !15
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for.end: ; preds = %for.body
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store i32 %add, ptr %diff, align 4, !dbg !19, !tbaa !11
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call void @ibar(ptr %diff) #2, !dbg !22
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ret i32 0, !dbg !23
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}
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declare void @ibar(ptr) #1
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!llvm.module.flags = !{!7, !8}
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!llvm.ident = !{!9}
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!llvm.dbg.cu = !{!24}
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!1 = !DIFile(filename: "vectorization-remarks.c", directory: ".")
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!2 = !{}
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!3 = !{!4}
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!4 = distinct !DISubprogram(name: "foo", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !24, scopeLine: 6, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!5 = !DIFile(filename: "vectorization-remarks.c", directory: ".")
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!6 = !DISubroutineType(types: !2)
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!7 = !{i32 2, !"Dwarf Version", i32 4}
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!8 = !{i32 1, !"Debug Info Version", i32 3}
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!9 = !{!"clang version 3.5.0 "}
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!10 = !DILocation(line: 8, column: 3, scope: !4)
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!11 = !{!12, !12, i64 0}
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!12 = !{!"int", !13, i64 0}
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!13 = !{!"omnipotent char", !14, i64 0}
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!14 = !{!"Simple C/C++ TBAA"}
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!15 = !DILocation(line: 17, column: 8, scope: !16)
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!16 = distinct !DILexicalBlock(line: 17, column: 8, file: !1, scope: !17)
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!17 = distinct !DILexicalBlock(line: 17, column: 8, file: !1, scope: !18)
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!18 = distinct !DILexicalBlock(line: 17, column: 3, file: !1, scope: !4)
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!19 = !DILocation(line: 18, column: 5, scope: !20)
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!20 = distinct !DILexicalBlock(line: 17, column: 27, file: !1, scope: !18)
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!21 = !{!13, !13, i64 0}
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!22 = !DILocation(line: 20, column: 3, scope: !4)
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!23 = !DILocation(line: 21, column: 3, scope: !4)
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!24 = distinct !DICompileUnit(language: DW_LANG_C89, file: !1, emissionKind: NoDebug)
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