https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100257
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Looks like a few missed optimizations at the tree level (and a target issue of
the store):
memcpy (&pixel, src_33, 6);
_1 = pixel.b;
_2 = pixel.g;
_3 = pixel.r;
val_2.0_21 = (short int) _1;
val_1.1_22 = (short int) _2;
val_0.2_23 = (short int) _3;
_24 = {val_0.2_23, val_1.1_22, val_2.0_21, 0, 0, 0, 0, 0};
_25 = __builtin_ia32_vcvtph2ps (_24);
_14 = BIT_FIELD_REF <_25, 64, 0>;
_28 = BIT_FIELD_REF <_25, 32, 64>;
MEM <vector(2) float> [(float *)dst_34] = _14;
MEM[(float *)dst_34 + 8B] = _28;
MEM[(float *)dst_34 + 12B] = 1.0e+0;
The store issue is now PR 100258.
This is more about the missed optimization of the first part, the conversion.
