[Bug target/47440] Use LCM for vzeroupper insertion

[uros at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47440

--- Comment #8 from uros at gcc dot gnu.org 2012-11-14 16:47:43 UTC ---
Author: uros
Date: Wed Nov 14 16:47:29 2012
New Revision: 193503

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=193503
Log:
    PR target/47440
    * config/i386/i386.c (gate_insert_vzeroupper): New function.
    (rest_of_handle_insert_vzeroupper): Ditto.
    (struct rtl_opt_pass pass_insert_vzeroupper): New.
    (ix86_option_override): Register vzeroupper insertion pass here.
    (ix86_check_avx256_register): Handle SUBREGs properly.
    (ix86_init_machine_status): Remove optimize_mode_switching[AVX_U128]
    initialization.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c