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[Bug tree-optimization/68956] New: [6 regression] Vectorizer miscompilation of 416.gamess


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68956

            Bug ID: 68956
           Summary: [6 regression] Vectorizer miscompilation of 416.gamess
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ienkovich at gcc dot gnu.org
  Target Milestone: ---

Created attachment 37061
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37061&action=edit
Reproducer

Here is a test reduced from 416.gamess which fails when vectorizer is enabled.

>gfortran -ffast-math -mfpmath=sse -O2 -march=core-avx2 -m32 test.f -o test
>./test
>gfortran -ffast-math -mfpmath=sse -O2 -march=core-avx2 -m32 test.f -ftree-vectorize -o test
>./test

Program aborted. Backtrace:
#0  0xF76B4E63
#1  0xF76B6820
#2  0xF777AB78
#3  0x80489A7 in MAIN__ at test.f:?
Aborted (core dumped)

Used compiler:

Target: x86_64-pc-linux-gnu
Configured with: /export/users/gnutester/stability/svn/trunk/configure
--with-arch=corei7 --with-cpu=corei7 --enable-clocale=gnu --with-system-zlib
--enable-shared --with-demangler-in-ld --enable-cloog-backend=isl
--with-fpmath=sse --with-pkgversion=Revision=231720
--prefix=/export/users/gnutester/stability/work/trunk/64/install
--enable-languages=c,c++,fortran,java,lto
Thread model: posix
gcc version 6.0.0 20151216 (experimental) (Revision=231720)

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