[Bug target/63678] __mm256_blend_epi16 only accepts 8-bit masks (should accept 16-bit)

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63678

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Trying icc 14.0.2.144 Build 2014012, I see that
a) it indeed fails to report the bug in your source
b) when using -c, it silently discards the upper 8 bits of the immediate, so
   you end up with:
   0:    c4 e3 7d 0e c1 cd        vpblendw $0xcd,%ymm1,%ymm0,%ymm0
c) when using -S, it generates invalid assembly:
        vpblendw  $43981, %ymm1, %ymm0, %ymm0                   #4.16
   which doesn't assemble at least with gas.
So, I believe erroring out on this is significantly better than what icc does
with it.