On 12/13/2012 09:25 AM, Ian Bolton wrote:
> This patch significantly reduces the number of redundant
> uxtw instructions seen in a variety of programs.
>
> (There are further patterns that can be done, but I have them
> in a separate patch that's still in development.)
What do you get if you enable flag_ree, as we do for x86_64?
In theory this should avoid even more extensions...
C.f. common/config/i386/i386-common.c:
static const struct default_options ix86_option_optimization_table[] =
{
/* Enable redundant extension instructions removal at -O2 and higher. */
{ OPT_LEVELS_2_PLUS, OPT_free, NULL, 1 },
r~
