https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88760
--- Comment #43 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> --- Author: guojiufu Date: Mon Nov 11 06:30:38 2019 New Revision: 278034 URL: https://gcc.gnu.org/viewcvs?rev=278034&root=gcc&view=rev Log: rs6000: Refine small loop unroll in loop_unroll_adjust hook In this patch, loop unroll adjust hook is introduced for powerpc. We can do target related heuristic adjustment in this hook. In this patch, -funroll-loops is enabled for small loops at O2 and above with an option -munroll-small-loops to guard the small loops unrolling, and it works fine with -flto. gcc/ 2019-11-11 Jiufu Guo <guoji...@linux.ibm.com> PR tree-optimization/88760 * gcc/config/rs6000/rs6000.opt (-munroll-only-small-loops): New option. * gcc/common/config/rs6000/rs6000-common.c (rs6000_option_optimization_table) [OPT_LEVELS_2_PLUS_SPEED_ONLY]: Turn on -funroll-loops and -munroll-only-small-loops. [OPT_LEVELS_ALL]: Turn off -fweb and -frename-registers. * config/rs6000/rs6000.c (rs6000_option_override_internal): Remove set of PARAM_MAX_UNROLL_TIMES and PARAM_MAX_UNROLLED_INSNS. Turn off -munroll-only-small-loops for explicit -funroll-loops. (TARGET_LOOP_UNROLL_ADJUST): Add loop unroll adjust hook. (rs6000_loop_unroll_adjust): Define it. Use -munroll-only-small-loops. gcc.testsuite/ 2019-11-11 Jiufu Guo <guoji...@linux.ibm.com> PR tree-optimization/88760 * gcc.dg/pr59643.c: Update back to r277550. Modified: trunk/gcc/ChangeLog trunk/gcc/common/config/rs6000/rs6000-common.c trunk/gcc/config/rs6000/rs6000.c trunk/gcc/config/rs6000/rs6000.opt trunk/gcc/testsuite/ChangeLog trunk/gcc/testsuite/gcc.dg/pr59643.c
