r217509 - in /trunk/gcc: ChangeLog optabs.c tre...

[alalaw01 at gcc dot gnu dot org]

Author: alalaw01
Date: Thu Nov 13 16:27:37 2014
New Revision: 217509

URL: https://gcc.gnu.org/viewcvs?rev=217509&root=gcc&view=rev
Log:
[Vectorizer] Use a VEC_PERM_EXPR instead of VEC_RSHIFT_EXPR; expand appropriate VEC_PERM_EXPRs using vec_shr_optab

	* optabs.c (can_vec_perm_p): Update comment, does not consider vec_shr.
	(shift_amt_for_vec_perm_mask): New.
	(expand_vec_perm_1): Use vec_shr_optab if second vector is const0_rtx
	and mask appropriate.

	* tree-vect-loop.c (calc_vec_perm_mask_for_shift): New.
	(have_whole_vector_shift): New.
	(vect_model_reduction_cost): Call have_whole_vector_shift instead of
	looking for vec_shr_optab.
	(vect_create_epilog_for_reduction): Likewise; also rename local variable
	have_whole_vector_shift to reduce_with_shift; output VEC_PERM_EXPRs
	instead of VEC_RSHIFT_EXPRs.

	* tree-vect-stmts.c (vect_gen_perm_mask_checked): Extend comment.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/optabs.c
    trunk/gcc/tree-vect-loop.c
    trunk/gcc/tree-vect-stmts.c