[Bug tree-optimization/66142] New: Loop is not vectorized because not sufficient support for GOMP_SIMD_LANE

["ysrumyan at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66142

            Bug ID: 66142
           Summary: Loop is not vectorized because not sufficient support
                    for GOMP_SIMD_LANE
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ysrumyan at gmail dot com
  Target Milestone: ---

The attached test-case compiled with "-Ofast -fopenmp -march=core-avx2" options
contains loop marked with pragma omp simd which is not vectorized:
t1.cpp:66:20: note: not vectorized: data ref analysis failed MEM[(struct vec_
*)_9] = 1.0e+0;
where index is defined as
  _12 = GOMP_SIMD_LANE (simduid.0_11(D));
  _9 = &D.4231[_12].org;

Note that this test was extracted from important benchmark and loop in question
is vectorized if we revert fix for 59984.