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| author | wm4 <wm4@nowhere> | 2019-10-31 13:16:58 +0100 |
|---|---|---|
| committer | wm4 <wm4@nowhere> | 2019-10-31 13:16:58 +0100 |
| commit | 7510ed6f684041db643c051cb17b13abf663b3b2 (patch) | |
| tree | e99355085b8f9ccb13d883d08dc22dca1a58ff50 /common/common.h | |
| parent | 6d92e5550203b04b7254eb8ffe31734e57070d79 (diff) | |
| download | mpv-7510ed6f684041db643c051cb17b13abf663b3b2.tar.bz2 mpv-7510ed6f684041db643c051cb17b13abf663b3b2.tar.xz | |
common: add mp_log2()
To be used in the next commit.
According to compiler explorer, __builtin_clz is very widely available,
and it barely makes sense to provide a fallback. clang also eats this
(and identifies at least as GCC 4). Actually, there's doubt that a fast
log2 implementation is needed at all (I guess UTF-8 parsing needs it,
but something UTF-8-specific would probably make it faster than using
log2). So the fallback is just something naive.
Diffstat (limited to 'common/common.h')
| -rw-r--r-- | common/common.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/common/common.h b/common/common.h index 16e1ec4cfd..5e6950c931 100644 --- a/common/common.h +++ b/common/common.h @@ -88,6 +88,8 @@ bool mp_rect_intersection(struct mp_rect *rc, const struct mp_rect *rc2); bool mp_rect_contains(struct mp_rect *rc, int x, int y); bool mp_rect_equals(struct mp_rect *rc1, struct mp_rect *rc2); +unsigned int mp_log2(uint32_t v); + int mp_snprintf_cat(char *str, size_t size, const char *format, ...) PRINTF_ATTRIBUTE(3, 4); |