diff options
| author | guojiufu <guojiufu@linux.ibm.com> | 2020-04-27 14:08:20 +0800 |
|---|---|---|
| committer | guojiufu <guojiufu@linux.ibm.com> | 2020-04-27 14:08:20 +0800 |
| commit | 47c39faa67cc7bd567793b62718ab5e4f931e8d0 (patch) | |
| tree | 95d6841752c8807dfd73c69fdd2b5f123985aad0 /gcc/common | |
| parent | 66711279083121b07d909ac0fc2f3a744ac7c937 (diff) | |
| download | gcc-47c39faa67cc7bd567793b62718ab5e4f931e8d0.zip gcc-47c39faa67cc7bd567793b62718ab5e4f931e8d0.tar.gz gcc-47c39faa67cc7bd567793b62718ab5e4f931e8d0.tar.bz2 | |
rs6000: enable -fweb for small loops unrolling
Previously -fweb was disabled if only unroll small loops. After that
we find there is cases where it could help to rename pseudos and avoid
some anti-dependence which may occur after unroll.
This patch enables -fweb for small loops unrolling.
2020-04-27 Jiufu Guo <guojiufu@cn.ibm.com>
* common/config/rs6000/rs6000-common.c
(rs6000_option_optimization_table) [OPT_LEVELS_ALL]: Remove turn off
-fweb.
* config/rs6000/rs6000.c (rs6000_option_override_internal): Avoid to
set flag_web.
Diffstat (limited to 'gcc/common')
| -rw-r--r-- | gcc/common/config/rs6000/rs6000-common.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/gcc/common/config/rs6000/rs6000-common.c b/gcc/common/config/rs6000/rs6000-common.c index 4f38d56..ee37b9d 100644 --- a/gcc/common/config/rs6000/rs6000-common.c +++ b/gcc/common/config/rs6000/rs6000-common.c @@ -38,9 +38,9 @@ static const struct default_options rs6000_option_optimization_table[] = 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 }, + + /* -frename-registers leads to non-optimal codegen and performance + on rs6000, turn it off by default. */ { OPT_LEVELS_ALL, OPT_frename_registers, NULL, 0 }, /* Double growth factor to counter reduced min jump length. */ |