diff options
Diffstat (limited to 'sysdeps/x86/cacheinfo.h')
| -rw-r--r-- | sysdeps/x86/cacheinfo.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/sysdeps/x86/cacheinfo.h b/sysdeps/x86/cacheinfo.h index eba8dbc4a6..41d2c81369 100644 --- a/sysdeps/x86/cacheinfo.h +++ b/sysdeps/x86/cacheinfo.h @@ -49,6 +49,11 @@ long int __x86_rep_stosb_threshold attribute_hidden = 2048; /* Threshold to stop using Enhanced REP MOVSB. */ long int __x86_rep_movsb_stop_threshold attribute_hidden; +/* A bit-wise OR of string/memory requirements for optimal performance + e.g. X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB. These bits + are used at runtime to tune implementation behavior. */ +int __x86_string_control attribute_hidden; + static void init_cacheinfo (void) { @@ -71,5 +76,9 @@ init_cacheinfo (void) __x86_rep_movsb_threshold = cpu_features->rep_movsb_threshold; __x86_rep_stosb_threshold = cpu_features->rep_stosb_threshold; __x86_rep_movsb_stop_threshold = cpu_features->rep_movsb_stop_threshold; + + if (CPU_FEATURES_ARCH_P (cpu_features, Avoid_Short_Distance_REP_MOVSB)) + __x86_string_control + |= X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB; } #endif |