mirror of
https://forge.sourceware.org/marek/gcc.git
synced 2026-02-22 03:47:02 -05:00
96bc77e45c
The following adjusts the condition where we reject vectorization because the scalar loop runs only for a single iteration (or two, in case we need to peel for gaps). Because this is over-eager when considering the case of VF == 1 where instead the cost model should decide wheter it is worthwhile or not. I'm playing conservative here and exclude the case of two iterations as I do not have benchmark evidence. This helps fixing a regression observed with improved SLP handling, not exactly for the options used in the PR though, but for a more common -O3 -march=x86-64-v3 this speeds up 433.milc by 6%. PR tree-optimization/123190 * tree-vect-loop.cc (vect_analyze_loop_costing): Allow vectorizing loops with a single scalar iteration iff the vectorization factor is 1. * gcc.dg/vect/costmodel/x86_64/costmodel-pr123190-1.c: New testcase. * gcc.dg/vect/slp-28.c: Avoid epilogue vectorization for simplicity.
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.