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Use likely()/unlikely() macros to improve branch prediction.

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This commit is contained in:
Simon Ruderich
2013-06-10 06:06:00 +02:00
parent 9862b8c8f1
commit 048bd6f9e7
5 changed files with 56 additions and 14 deletions
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20
src/hookmacros.h
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@@ -56,10 +56,10 @@
#define _HOOK_PRE(type, name) \
int handle; \
if (!(real_ ## name )) { \
if (unlikely(!(real_ ## name ))) { \
*(void **) (&(real_ ## name)) = dlsym_function(#name); \
/* Initialize our data while we're at it. */ \
if (!initialized) { \
if (unlikely(!initialized)) { \
init_from_environment(); \
} \
}
@@ -68,8 +68,8 @@
_HOOK_PRE_FD_(type, name, fd)
#define _HOOK_PRE_FD_(type, name, fd) \
_HOOK_PRE(type, name) \
if (tracked_fds_find(fd)) { \
if (force_write_to_non_tty) { \
if (unlikely(tracked_fds_find(fd))) { \
if (unlikely(force_write_to_non_tty)) { \
handle = 1; \
} else { \
handle = isatty(fd); \
@@ -77,14 +77,14 @@
} else { \
handle = 0; \
} \
if (handle) { \
if (unlikely(handle)) { \
handle_fd_pre(fd); \
}
#define _HOOK_PRE_FILE(type, name, file) \
type result; \
_HOOK_PRE(type, name) \
if (tracked_fds_find(fileno(file))) { \
if (force_write_to_non_tty) { \
if (unlikely(tracked_fds_find(fileno(file)))) { \
if (unlikely(force_write_to_non_tty)) { \
handle = 1; \
} else { \
handle = isatty(fileno(file)); \
@@ -92,18 +92,18 @@
} else { \
handle = 0; \
} \
if (handle) { \
if (unlikely(handle)) { \
handle_file_pre(file); \
}
#define _HOOK_POST_FD_(fd) \
if (handle) { \
if (unlikely(handle)) { \
handle_fd_post(fd); \
}
#define _HOOK_POST_FD(fd) \
_HOOK_POST_FD_(fd) \
return result;
#define _HOOK_POST_FILE(file) \
if (handle) { \
if (unlikely(handle)) { \
handle_file_post(file); \
} \
return result;