[Bug tree-optimization/68681] New: testcase gcc.dg/vect/pr45752.c fails on AArch64

[alalaw01 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68681

            Bug ID: 68681
           Summary: testcase gcc.dg/vect/pr45752.c fails on AArch64
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: alalaw01 at gcc dot gnu.org
  Target Milestone: ---
            Target: aarch64

Created attachment 36900
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36900&action=edit
tree-vect-details dump

Since r231015 (https://gcc.gnu.org/ml/gcc-patches/2015-11/msg03371.html), on
AArch64 we have

FAIL: gcc.dg/vect/pr45752.c scan-tree-dump-times vect "gaps requires scalar
epilogue loop" 0
FAIL: gcc.dg/vect/pr45752.c -flto -ffat-lto-objects  scan-tree-dump-times vect
"gaps requires scalar epilogue loop" 0

I attach -fdump-tree-vect-details from the non-lto case (line 5379:
gcc/testsuite/gcc.dg/vect/pr45752.c:45:3: note: Data access with gaps requires
scalar epilogue loop)