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| author | Jiufu Guo <guojiufu@linux.ibm.com> | 2019-11-11 06:30:38 +0000 |
|---|---|---|
| committer | Jiufu Guo <guojiufu@gcc.gnu.org> | 2019-11-11 06:30:38 +0000 |
| commit | 48f657953fe5f90218003c93feafdb3158e6d3d2 (patch) | |
| tree | 9723a1ee3ec29985e19ff7b9bd0b48b9bfb5892e /gcc/common/config/rs6000 | |
| parent | 103cba80bd84f0f3c7e644783e1fb7154d07f522 (diff) | |
| download | gcc-48f657953fe5f90218003c93feafdb3158e6d3d2.tar.gz | |
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 <guojiufu@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 <guojiufu@linux.ibm.com>
PR tree-optimization/88760
* gcc.dg/pr59643.c: Update back to r277550.
From-SVN: r278034
Diffstat (limited to 'gcc/common/config/rs6000')
| -rw-r--r-- | gcc/common/config/rs6000/rs6000-common.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/gcc/common/config/rs6000/rs6000-common.c b/gcc/common/config/rs6000/rs6000-common.c index b9471964a66..9dc7ae87f43 100644 --- a/gcc/common/config/rs6000/rs6000-common.c +++ b/gcc/common/config/rs6000/rs6000-common.c @@ -35,7 +35,14 @@ static const struct default_options rs6000_option_optimization_table[] = { OPT_LEVELS_ALL, OPT_fsplit_wide_types_early, NULL, 1 }, /* Enable -fsched-pressure for first pass instruction scheduling. */ { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 }, - { OPT_LEVELS_2_PLUS, OPT_funroll_loops, NULL, 1 }, + /* Enable -munroll-only-small-loops with -funroll-loops to unroll small + loops at -O2 and above by default. */ + { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_funroll_loops, NULL, 1 }, + { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_munroll_only_small_loops, NULL, 1 }, + /* -fweb and -frename-registers are useless in general for rs6000, + turn them off. */ + { OPT_LEVELS_ALL, OPT_fweb, NULL, 0 }, + { OPT_LEVELS_ALL, OPT_frename_registers, NULL, 0 }, { OPT_LEVELS_NONE, 0, NULL, 0 } }; |