Improve AGU stalls avoidance optimization.
2011-09-08 Enkovich Ilya <ilya.enkovich@intel.com>
* config/i386/i386-protos.h (ix86_lea_outperforms): New.
(ix86_avoid_lea_for_add): Likewise.
(ix86_avoid_lea_for_addr): Likewise.
(ix86_split_lea_for_addr): Likewise.
* config/i386/i386.c (LEA_MAX_STALL): New.
(increase_distance): Likewise.
(insn_defines_reg): Likewise.
(insn_uses_reg_mem): Likewise.
(distance_non_agu_define_in_bb): Likewise.
(distance_agu_use_in_bb): Likewise.
(ix86_lea_outperforms): Likewise.
(ix86_ok_to_clobber_flags): Likewise.
(ix86_avoid_lea_for_add): Likewise.
(ix86_avoid_lea_for_addr): Likewise.
(ix86_split_lea_for_addr): Likewise.
(distance_non_agu_define): Search in pred BBs added.
(distance_agu_use): Search in succ BBs added.
(IX86_LEA_PRIORITY): Value changed from 2 to 0.
(LEA_SEARCH_THRESHOLD): Now depends on LEA_MAX_STALL.
(ix86_lea_for_add_ok): Use ix86_lea_outperforms to make decision.
* config/i386/i386.md: Split added to transform non destructive
add into move and add.
(lea_1): transformed into insn_and_split to avoid AGU stalls.
(lea<mode>_2): Likewise.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@178689
138bc75d-0d04-0410-961f-
82ee72b054a4