[llvm-bugs] [Bug 27195] New: Delinearization fails to recognize the correct access function

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Apr 4 04:44:01 PDT 2016


            Bug ID: 27195
           Summary: Delinearization fails to recognize the correct access
           Product: Polly
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Other
          Assignee: polly-dev at googlegroups.com
          Reporter: doerfert at cs.uni-saarland.de
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 16164
  --> https://llvm.org/bugs/attachment.cgi?id=16164&action=edit
Wrong delinearization for accesses to "A" through "C".

Simialar to PR27013 delinearization of the attached test case generates a wrong
access function. The reasons also looks similar, both times the delinearization
analysis looks only at the first GEP in the IR but later we use
ScalarEvolution::getPointerBase to look though all GEPs.

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