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| author | Rich Felker <dalias@aerifal.cx> | 2015-08-16 18:15:18 +0000 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2015-08-16 18:15:18 +0000 |
| commit | 5a9c8c05a5a0cdced4122589184fd795b761bb4a (patch) | |
| tree | 34b9f909c151de0d24ec29ef194815a5fa4daede /src | |
| parent | c13f2af1fe1856e36dd1b2773cac05d5d72641dc (diff) | |
| download | musl-5a9c8c05a5a0cdced4122589184fd795b761bb4a.zip musl-5a9c8c05a5a0cdced4122589184fd795b761bb4a.tar.gz musl-5a9c8c05a5a0cdced4122589184fd795b761bb4a.tar.bz2 | |
mitigate performance regression in libc-internal locks on x86_64
commit 3c43c0761e1725fd5f89a9c028cbf43250abb913 fixed missing
synchronization in the atomic store operation for i386 and x86_64, but
opted to use mfence for the barrier on x86_64 where it's always
available. however, in practice mfence is significantly slower than
the barrier approach used on i386 (a nop-like lock orl operation).
this commit changes x86_64 (and x32) to use the faster barrier.
Diffstat (limited to 'src')
0 files changed, 0 insertions, 0 deletions