tree 5f498df50847e6fa6694df4544b46ddb0ffbb3bc
parent 2325d8af93ae2f044432b903a25e702f17cedff3
author Willy Tarreau <w@1wt.eu> 1539191156 +0200
committer Willy Tarreau <w@1wt.eu> 1539192263 +0200
encoding latin1

OPTIM: tools: optimize my_ffsl() for x86_64

This call is now used quite a bit in the fd cache, to decide which cache
to add/remove the fd to/from, when waking up a task for a single thread
in __task_wakeup(), in fd_cant_recv() and in fd_process_cached_events(),
and we can replace it with a single instruction, removing ~30 instructions
and ~80 bytes from the inner loop of some of these functions.

In addition the test for zero value was replaced with a comment saying
that it is illegal and leads to an undefined behaviour. The code does
not make use of this useless case today.