Willy Tarreau 89ee79845c MINOR: compiler: drop special cases of likely/unlikely for older compilers ...

We used to special-case the likely()/unlikely() macros for a series of
early gcc 4.x compilers which used to produce very bad code when using
__builtin_expect(x,1), which basically used to build an integer (0 or 1)
from a condition then compare it to integer 1. This was already fixed in
5.x, but even now, looking at the code produced by various flavors of 4.x
this bad behavior couldn't be witnessed anymore. So let's consider it as
fixed by now, which will allow to get rid of some ugly tricks at some
specific places. A test on 4.7.4 shows that the code shrinks by about 3kB
now, thanks to some tests being inlined closer to the call place and the
unlikely case being moved to real functions. See the link below for more
background on this.

Link: https://www.mail-archive.com/haproxy@formilux.org/msg36392.html

2020-02-25 07:29:55 +01:00

..

common

MINOR: compiler: drop special cases of likely/unlikely for older compilers

2020-02-25 07:29:55 +01:00

import

BUILD: threads/plock: fix a build issue on Clang without optimization

2017-11-20 21:06:35 +01:00

proto

CLEANUP: connection: remove the definitions of conn_xprt_{stop,want}_{send,recv}

2020-02-21 11:21:12 +01:00

types

MINOR: connection: introduce a new receive flag: CO_RFL_READ_ONCE

2020-02-21 11:22:45 +01:00