diff options
Diffstat (limited to 'sysdeps/x86_64/cacheinfo.c')
| -rw-r--r-- | sysdeps/x86_64/cacheinfo.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sysdeps/x86_64/cacheinfo.c b/sysdeps/x86_64/cacheinfo.c index 96463df064..143b3333a8 100644 --- a/sysdeps/x86_64/cacheinfo.c +++ b/sysdeps/x86_64/cacheinfo.c @@ -464,6 +464,9 @@ long int __x86_raw_shared_cache_size_half attribute_hidden = 1024 * 1024 / 2; /* Similar to __x86_shared_cache_size, but not rounded. */ long int __x86_raw_shared_cache_size attribute_hidden = 1024 * 1024; +/* Threshold to use non temporal store. */ +long int __x86_shared_non_temporal_threshold attribute_hidden; + #ifndef DISABLE_PREFETCHW /* PREFETCHW support flag for use in memory and string routines. */ int __x86_prefetchw attribute_hidden; @@ -662,4 +665,9 @@ init_cacheinfo (void) __x86_shared_cache_size_half = shared / 2; __x86_shared_cache_size = shared; } + + /* The large memcpy micro benchmark in glibc shows that 6 times of + shared cache size is the approximate value above which non-temporal + store becomes faster. */ + __x86_shared_non_temporal_threshold = __x86_shared_cache_size * 6; } |