| commit | 653c12c7d880340462bd963752619a7a61bcb4e3 | |
| author | Noah Goldstein <goldstein.w.n@gmail.com> | |
| Sat, 1 Oct 2022 04:13:27 +0000 (30 21:13 -0700) | ||
| committer | Noah Goldstein <goldstein.w.n@gmail.com> | |
| Mon, 3 Oct 2022 21:13:49 +0000 (3 14:13 -0700) | ||
| tree | 67c128963342987f4023beba5f752f20c59c8863 | treesnapshot (tar.gz zip) |
| parent | 10c779f44ab3e9525f2d2a3c9a0aa9dedea5f1ec | commitdiff |
x86: Cleanup pthread_spin_{try}lock.S
Save a jmp on the lock path coming from an initial failure in
pthread_spin_lock.S. This costs 4-bytes of code but since the
function still fits in the same number of 16-byte blocks (default
function alignment) it does not have affect on the total binary size
of libc.so (unchanged after this commit).
pthread_spin_trylock was using a CAS when a simple xchg works which
is often more expensive.
Full check passes on x86-64.
Save a jmp on the lock path coming from an initial failure in
pthread_spin_lock.S. This costs 4-bytes of code but since the
function still fits in the same number of 16-byte blocks (default
function alignment) it does not have affect on the total binary size
of libc.so (unchanged after this commit).
pthread_spin_trylock was using a CAS when a simple xchg works which
is often more expensive.
Full check passes on x86-64.
| sysdeps/x86_64/nptl/pthread_spin_lock.S | diffblobblamehistory | |
| sysdeps/x86_64/nptl/pthread_spin_trylock.S | diffblobblamehistory |