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__p__
2010 Apr 21
2
suggestion how to use memcpy in duplicate.c
...pyVector on three lines, dcf.c (once) and
dounzip.c (once).
For the DUPLICATE_ATOMIC_VECTOR macro there is already a comment next to it
:
<FIXME>: surely memcpy would be faster here?
which seems to refer to the for loop :
else { \
int __i__; \
type *__fp__ = fun(from), *__tp__ = fun(to); \
for (__i__ = 0; __i__ < __n__; __i__++) \
__tp__[__i__] = __fp__[__i__]; \
} \
Could that loop be replaced by the following ?
else { \
memcpy((char *)DATAPTR(to), (char *)DATAPTR(from), __n__*sizeof(type)); \
}\
In the data.table package, dogroups.c uses this...