https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90332
--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Kewen Lin <li...@gcc.gnu.org>: https://gcc.gnu.org/g:8d689cf43b501a2f5c077389adbb6d2bfa530ca9 commit r10-7415-g8d689cf43b501a2f5c077389adbb6d2bfa530ca9 Author: Kewen Lin <li...@linux.ibm.com> Date: Fri Mar 27 04:51:12 2020 -0500 Fix PR90332 by extending half size vector mode As PR90332 shows, the current scalar epilogue peeling for gaps elimination requires expected vec_init optab with two half size vector mode. On Power, we don't support vector mode like V8QI, so can't support optab like vec_initv16qiv8qi. But we want to leverage existing scalar mode like DI to init the desirable vector mode. This patch is to extend the existing support for Power, as evaluated on Power9 we can see expected 1.9% speed up on SPEC2017 525.x264_r. As Richi suggested, add one function vector_vector_composition_type to refactor existing related codes and also make use of it further. Bootstrapped/regtested on powerpc64le-linux-gnu (LE) P8 and P9, as well as x86_64-redhat-linux. gcc/ChangeLog 2020-03-27 Kewen Lin <li...@gcc.gnu.org> PR tree-optimization/90332 * tree-vect-stmts.c (vector_vector_composition_type): New function. (get_group_load_store_type): Adjust to call vector_vector_composition_type, extend it to construct with scalar types. (vectorizable_load): Likewise.
