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| author | Michal Terepeta <michal.terepeta@gmail.com> | 2019-03-24 13:58:53 +0100 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2019-04-01 20:07:49 -0400 |
| commit | 7cf5ba3dba88356571197b470556e888581212d7 (patch) | |
| tree | 6e89f905fe3f630ffa6684c661c374be2bfd5ff6 /includes/Rts.h | |
| parent | 39282422afe58a0855c2fe5315163236c116c2f4 (diff) | |
| download | haskell-7cf5ba3dba88356571197b470556e888581212d7.tar.gz | |
Improve performance of newSmallArray#
This:
- Hoists part of the condition outside of the initialization loop in
`stg_newSmallArrayzh`.
- Annotates one of the unlikely branches as unlikely, also in
`stg_newSmallArrayzh`.
- Adds a couple of annotations to `allocateMightFail` indicating which
branches are likely to be taken.
Together this gives about 5% improvement.
Signed-off-by: Michal Terepeta <michal.terepeta@gmail.com>
Diffstat (limited to 'includes/Rts.h')
| -rw-r--r-- | includes/Rts.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/includes/Rts.h b/includes/Rts.h index a1a83397f3..f1f8351298 100644 --- a/includes/Rts.h +++ b/includes/Rts.h @@ -58,7 +58,13 @@ extern "C" { #if __GNUC__ >= 4 #define RTS_UNLIKELY(p) __builtin_expect((p),0) #else -#define RTS_UNLIKELY(p) p +#define RTS_UNLIKELY(p) (p) +#endif + +#if __GNUC__ >= 4 +#define RTS_LIKELY(p) __builtin_expect(!!(p), 1) +#else +#define RTS_LIKELY(p) (p) #endif /* __builtin_unreachable is supported since GNU C 4.5 */ |