[Bug tree-optimization/70251] Wrong code with -O3 -march=skylake-avx512.

[ienkovich at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70251

Ilya Enkovich <ienkovich at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-03-16
     Ever confirmed|0                           |1

--- Comment #1 from Ilya Enkovich <ienkovich at gcc dot gnu.org> ---
Confirm.  The problem is that

vect_patt_50.39_93 = VEC_COND_EXPR <mask_patt_51.38_90, { 1, .. , 1 }, { 0, ..
, 0 }>;
vect__17.44_98 = vect_patt_50.39_93 + vect__16.43_97;

is replaced with:

_1 = VIEW_CONVERT_EXPR<vector(64) unsigned char>(mask_patt_51.38_90);
vect__17.44_98 = vect__16.43_97 - _1;

which works for vector masks but doesn't work for scalar masks.