[Bug c/68123] GCC vector extension behaves funny with large vector size

[dxin at usc dot edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68123

--- Comment #1 from Dehuan Xin <dxin at usc dot edu> ---
compiler info:
arm-linux-gnueabihf-gcc (crosstool-NG linaro-1.13.1-4.8-2013.11 - Linaro GCC
2013.10) 4.8.3 20131111 (prerelease)