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| author | Fredrik Lundh <fredrik@pythonware.com> | 2006-05-22 17:12:58 (GMT) |
|---|---|---|
| committer | Fredrik Lundh <fredrik@pythonware.com> | 2006-05-22 17:12:58 (GMT) |
| commit | 8a8e05a2b9c629827827295a7bd76494aed41b72 (patch) | |
| tree | 16a684efaec310a8bd650509ab40c2e979a32e55 /Include | |
| parent | f1d60a53845d2efeccdb61bebf6ee8df94df16d4 (diff) | |
| download | cpython-8a8e05a2b9c629827827295a7bd76494aed41b72.zip cpython-8a8e05a2b9c629827827295a7bd76494aed41b72.tar.gz cpython-8a8e05a2b9c629827827295a7bd76494aed41b72.tar.bz2 | |
needforspeed: use memcpy for "long" strings; use a better algorithm
for long repeats.
Diffstat (limited to 'Include')
| -rw-r--r-- | Include/unicodeobject.h | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/Include/unicodeobject.h b/Include/unicodeobject.h index 7917c68..c0036bf 100644 --- a/Include/unicodeobject.h +++ b/Include/unicodeobject.h @@ -352,14 +352,19 @@ typedef PY_UNICODE_TYPE Py_UNICODE; Py_UNICODE_ISDIGIT(ch) || \ Py_UNICODE_ISNUMERIC(ch)) +/* memcpy has a considerable setup overhead on many platforms; use a + loop for short strings (the "16" below is pretty arbitary) */ #define Py_UNICODE_COPY(target, source, length) do\ - {int i; Py_UNICODE *t = (target); const Py_UNICODE *s = (source);\ - for (i = 0; i < (length); i++) t[i] = s[i];\ + {Py_ssize_t i_; Py_UNICODE *t_ = (target); const Py_UNICODE *s_ = (source);\ + if (length > 16)\ + memcpy(t_, s_, (length)*sizeof(Py_UNICODE));\ + else\ + for (i_ = 0; i_ < (length); i_++) t_[i_] = s_[i_];\ } while (0) #define Py_UNICODE_FILL(target, value, length) do\ - {int i; Py_UNICODE *t = (target); Py_UNICODE v = (value);\ - for (i = 0; i < (length); i++) t[i] = v;\ + {Py_ssize_t i_; Py_UNICODE *t_ = (target); Py_UNICODE v_ = (value);\ + for (i_ = 0; i_ < (length); i_++) t_[i_] = v_;\ } while (0) #define Py_UNICODE_MATCH(string, offset, substring)\ |