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needforspeed: added Py_MEMCPY macro (currently tuned for Visual C only),

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and use it for string copy operations.  this gives a 20% speedup on some
string benchmarks.
This commit is contained in:
Fredrik Lundh 2006-05-28 12:06:46 +00:00
parent 5e9d6cfbda
commit 80f8e80c15
3 changed files with 60 additions and 46 deletions
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11
Include/unicodeobject.h
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@ -357,15 +357,8 @@ 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\
{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_COPY(target, source, length) \
Py_MEMCPY((target), (source), (length)*sizeof(Py_UNICODE))
#define Py_UNICODE_FILL(target, value, length) do\
{Py_ssize_t i_; Py_UNICODE *t_ = (target); Py_UNICODE v_ = (value);\