[Bug c/60117] simd reduction clause suppresses simd auto-vectorization when -fopenmp is set

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60117

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
If the inner loop body is written as
x = a[i__] > x ? a[i__] : x;
then we actually do vectorize with -Ofast -fopenmp-simd, but for some reason
the vectorized loop is optimized away as dead later on.
For vectorization of the original loop, not sure if we can safely transform omp
simd array conditional stores into unconditional read + conditional operation +
unconditional store, or if we should (and why don't we) transform those into
MASK_STORE.