[LLVMbugs] [Bug 21078] New: [LoopVectorize] LLVM crashes for '-fslp-vectorize-aggressive'

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21078

            Bug ID: 21078
           Summary: [LoopVectorize] LLVM crashes for
                    '-fslp-vectorize-aggressive'
           Product: new-bugs
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: kongy.dev at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 13092
  --> http://llvm.org/bugs/attachment.cgi?id=13092&action=edit
Reduced failure case

Clang fails multiple LNT test suite cases after r217144, when compiled with
'-O3 -fslp-vectorize-aggressive', with error message 'Instruction does not
dominate all uses!'.

The cause is found out to be running CSE after loop vectorize pass may
fail(enabled in BBVectorizer). The bug is revealed due to the reordering of
SLP/BB vectorizer around loop vectorizer. A reduced test case is attached.

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