[Bug tree-optimization/57275] [4.9 Regression] Error in data dependence analysis during gather vectorization

[andrey.turetskiy at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57275

--- Comment #4 from Andrey Turetskiy <andrey.turetskiy at gmail dot com> ---

> -         return false;
> +         return true;

Isn't it too strong?
Shouldn't it be like this:

return !(DR_IS_READ (dra) && DR_IS_READ (drb));

Gather is a load operation. If another statement is load too, I think the loop
still can be vectorized.