https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90693
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:103a3966bc7b68f91b6cd3c5beb330c4b8570c90 commit r14-5613-g103a3966bc7b68f91b6cd3c5beb330c4b8570c90 Author: Jakub Jelinek <ja...@redhat.com> Date: Mon Nov 20 10:03:20 2023 +0100 tree-ssa-math-opts: popcount (X) == 1 to (X ^ (X - 1)) > (X - 1) optimization for direct optab [PR90693] On Fri, Nov 17, 2023 at 03:01:04PM +0100, Jakub Jelinek wrote: > As a follow-up, I'm considering changing in this routine the popcount > call to IFN_POPCOUNT with 2 arguments and during expansion test costs. Here is the follow-up which does the rtx costs testing. 2023-11-20 Jakub Jelinek <ja...@redhat.com> PR tree-optimization/90693 * tree-ssa-math-opts.cc (match_single_bit_test): Mark POPCOUNT with result only used in equality comparison against 1 with direct optab support as .POPCOUNT call with 2 arguments. * internal-fn.h (expand_POPCOUNT): Declare. * internal-fn.def (DEF_INTERNAL_INT_EXT_FN): New macro, document it, undefine at the end. (POPCOUNT): Use it instead of DEF_INTERNAL_INT_FN. * internal-fn.cc (DEF_INTERNAL_INT_EXT_FN): Define to nothing before inclusion to define expanders. (expand_POPCOUNT): New function.
