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MINOR: compiler: restore the likely() wrapper for gcc 5.x

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After some tests, gcc 5.x produces better code with likely()
than without, contrary to gcc 4.x where it was better to disable
it. Let's re-enable it for 5 and above.
This commit is contained in:
Willy Tarreau 2017-10-08 22:26:03 +02:00
parent 636e6afcfa
commit c939835f77
1 changed files with 2 additions and 2 deletions
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4
include/common/compiler.h
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@ -89,8 +89,8 @@
#define __builtin_expect(x,y) (x)
#define likely(x) (x)
#define unlikely(x) (x)
#elif __GNUC__ < 4
/* gcc 3.x does the best job at this */
#elif __GNUC__ < 4 || __GNUC__ >= 5
/* gcc 3.x and 5.x do the best job at this */
#define likely(x) (__builtin_expect((x) != 0, 1))
#define unlikely(x) (__builtin_expect((x) != 0, 0))
#else