d9f306aa52
If DoExtraAnalysis is true (e.g. because remarks are enabled), we continue with the analysis rather than exiting. Update code to conditionally check if the ExitBB has phis or not a single predecessor. Otherwise a nullptr is dereferenced with DoExtraAnalysis.
29 lines
1.0 KiB
LLVM
29 lines
1.0 KiB
LLVM
; RUN: opt -disable-output -loop-vectorize -pass-remarks-analysis='.*' -force-vector-width=2 2>&1 %s | FileCheck %s
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; Make sure LV does not crash when generating remarks for loops with non-unique
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; exit blocks.
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define i32 @test_non_unique_exit_blocks(i32* nocapture readonly align 4 dereferenceable(1024) %data, i32 %x) {
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; CHECK: loop not vectorized: loop control flow is not understood by vectorizer
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;
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entry:
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br label %for.header
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for.header: ; preds = %for.cond.lr.ph, %for.body
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%iv = phi i64 [ 0, %entry ], [ %iv.next, %for.latch ]
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%iv.next = add nuw nsw i64 %iv, 1
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%exitcond.not = icmp eq i64 %iv.next, 256
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br i1 %exitcond.not, label %header.exit, label %for.latch
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for.latch:
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%arrayidx = getelementptr inbounds i32, i32* %data, i64 %iv
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%lv = load i32, i32* %arrayidx, align 4
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%cmp1 = icmp eq i32 %lv, %x
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br i1 %cmp1, label %latch.exit, label %for.header
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header.exit: ; preds = %for.body
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ret i32 0
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latch.exit: ; preds = %for.body
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ret i32 %lv
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}
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