On 20 September 2011 11:12, Richard Sandiford
wrote:
> Ping for:
>
> http://gcc.gnu.org/ml/gcc-patches/2011-09/msg00626.html
>
> which allows taking the vector subreg of a structure mode to be treated
> as "cheap" (because direct register references are allowed). At the
> moment we treat them
Ping for:
http://gcc.gnu.org/ml/gcc-patches/2011-09/msg00626.html
which allows taking the vector subreg of a structure mode to be treated
as "cheap" (because direct register references are allowed). At the
moment we treat them as expensive.
Richard
ARM's MODES_TIEABLE_P only allows classes of the same mode to be tied:
#define MODES_TIEABLE_P(MODE1, MODE2) \
(GET_MODE_CLASS (MODE1) == GET_MODE_CLASS (MODE2))
But for NEON, we'd like structure modes to be tied to their vector
elements. In particular, a vector subreg of a structure
