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6bd831ab4b
This patch fixes PR39099. When strided loads are predicated, each of them will form an interleaved-group (with gaps). However, subsequent stages of vectorization (planning and transformation) assume that if a load is part of an Interleave-Group it is not predicated, resulting in wrong code - unmasked wide loads are created. The Interleaving Analysis does take care not to have conditional interleave groups of size > 1, but until we extend the planning and transformation stages to support masked-interleave-groups we should also avoid having them for size == 1. Reviewers: Ayal, hsaito, dcaballe, fhahn Reviewed By: Ayal Differential Revision: https://reviews.llvm.org/D52682 llvm-svn: 343931
43 lines
1.4 KiB
LLVM
43 lines
1.4 KiB
LLVM
; REQUIRES: asserts
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; RUN: opt -S -loop-vectorize -force-vector-width=8 -force-vector-interleave=1 -enable-interleaved-mem-accesses -debug-only=loop-vectorize,vectorutils -disable-output < %s 2>&1 | FileCheck %s
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target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
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; Ensure that we don't create interleave groups for predicated
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; strided accesses.
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; CHECK: LV: Checking a loop in "masked_strided"
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; CHECK: LV: Analyzing interleaved accesses...
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; CHECK-NOT: LV: Creating an interleave group
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define dso_local void @masked_strided(i8* noalias nocapture readonly %p, i8* noalias nocapture %q, i8 zeroext %guard) local_unnamed_addr {
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entry:
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%conv = zext i8 %guard to i32
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br label %for.body
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for.body:
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%ix.017 = phi i32 [ 0, %entry ], [ %inc, %for.inc ]
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%cmp1 = icmp ugt i32 %ix.017, %conv
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br i1 %cmp1, label %if.then, label %for.inc
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if.then:
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%mul = shl nuw nsw i32 %ix.017, 1
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%arrayidx = getelementptr inbounds i8, i8* %p, i32 %mul
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%0 = load i8, i8* %arrayidx, align 1
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%arrayidx4 = getelementptr inbounds i8, i8* %q, i32 %mul
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store i8 %0, i8* %arrayidx4, align 1
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%sub = sub i8 0, %0
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%add = or i32 %mul, 1
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%arrayidx8 = getelementptr inbounds i8, i8* %q, i32 %add
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store i8 %sub, i8* %arrayidx8, align 1
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br label %for.inc
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for.inc:
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%inc = add nuw nsw i32 %ix.017, 1
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%exitcond = icmp eq i32 %inc, 1024
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br i1 %exitcond, label %for.end, label %for.body
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for.end:
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ret void
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}
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