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Issue #13136: speed up conversion between different character widths.

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This commit is contained in:
Antoine Pitrou 2011-10-11 20:58:41 +02:00
parent 2c3b2302ad
commit e459a0877e
1 changed files with 14 additions and 5 deletions
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19
Objects/unicodeobject.c
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@ -177,12 +177,21 @@ extern "C" {
buffer where the result characters are written to. */
#define _PyUnicode_CONVERT_BYTES(from_type, to_type, begin, end, to) \
do { \
const from_type *iter_; to_type *to_; \
for (iter_ = (begin), to_ = (to_type *)(to); \
iter_ < (end); \
++iter_, ++to_) { \
*to_ = (to_type)*iter_; \
to_type *_to = (to_type *) to; \
const from_type *_iter = (begin); \
const from_type *_end = (end); \
Py_ssize_t n = (_end) - (_iter); \
const from_type *_unrolled_end = \
_iter + (n & ~ (Py_ssize_t) 3); \
while (_iter < (_unrolled_end)) { \
_to[0] = (to_type) _iter[0]; \
_to[1] = (to_type) _iter[1]; \
_to[2] = (to_type) _iter[2]; \
_to[3] = (to_type) _iter[3]; \
_iter += 4; _to += 4; \
} \
while (_iter < (_end)) \
*_to++ = (to_type) *_iter++; \
} while (0)
/* The Unicode string has been modified: reset the hash */