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likely.h: fix spdk_likely condition

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The __builtin_expect(), as written before, would have generated the
right branch taken/not taken condition, but the return value was the
opposite of the cond value.

We need to double-not the value to convert it to a 0/1 value while
preserving its original 0/non-zero sense.

Change-Id: I38101ff3ed8e89fc6516cfcdf7d642651545e4ff
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
This commit is contained in:
Daniel Verkamp 2016-12-15 13:01:08 -07:00
parent 01529c676b
commit 6854710d6d
1 changed files with 1 additions and 1 deletions
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include/spdk/likely.h
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@ -39,6 +39,6 @@
#define SPDK_LIKELY_H
#define spdk_unlikely(cond) __builtin_expect((cond), 0)
#define spdk_likely(cond) __builtin_expect(!(cond), 0)
#define spdk_likely(cond) __builtin_expect(!!(cond), 1)
#endif