https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80846
--- Comment #19 from Richard Biener <rguenth at gcc dot gnu.org> --- Author: rguenth Date: Fri Jan 12 11:43:13 2018 New Revision: 256576 URL: https://gcc.gnu.org/viewcvs?rev=256576&root=gcc&view=rev Log: 2018-01-12 Richard Biener <rguent...@suse.de> PR tree-optimization/80846 * target.def (split_reduction): New target hook. * targhooks.c (default_split_reduction): New function. * targhooks.h (default_split_reduction): Declare. * tree-vect-loop.c (vect_create_epilog_for_reduction): If the target requests first reduce vectors by combining low and high parts. * tree-vect-stmts.c (vect_gen_perm_mask_any): Adjust. (get_vectype_for_scalar_type_and_size): Export. * tree-vectorizer.h (get_vectype_for_scalar_type_and_size): Declare. * doc/tm.texi.in (TARGET_VECTORIZE_SPLIT_REDUCTION): Document. * doc/tm.texi: Regenerate. i386/ * config/i386/i386.c (ix86_split_reduction): Implement TARGET_VECTORIZE_SPLIT_REDUCTION. * gcc.target/i386/pr80846-1.c: New testcase. * gcc.target/i386/pr80846-2.c: Likewise. Added: trunk/gcc/testsuite/gcc.target/i386/pr80846-1.c trunk/gcc/testsuite/gcc.target/i386/pr80846-2.c Modified: trunk/gcc/ChangeLog trunk/gcc/config/i386/i386.c trunk/gcc/doc/tm.texi trunk/gcc/doc/tm.texi.in trunk/gcc/target.def trunk/gcc/targhooks.c trunk/gcc/targhooks.h trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-vect-loop.c trunk/gcc/tree-vect-stmts.c trunk/gcc/tree-vectorizer.h
