On Tuesday, 8 April 2014 at 11:56:43 UTC, ketmar wrote:
I understand that. But why is dest[] = src[] not good enough
for run-time?
'cause some compilers (gcc, for example) has memcpy() as
'intrinsic' and generates better inline code for it sometimes.
it's just a small hint for compiler backend, and faster code is
good, isn't it? ;-)
a[] = b[] causes the compiler to generate a call to _d_arraycopy,
and _d_arraycopy calls, you guessed it, memcpy! (verified with
GDC 4.8.2) So, there is no performance benefit calling memcpy
directly. It's going to be called anyway.
I'm beginning to believe that, at least in the code I posted,
memcpy can be replaced by the array syntax, removing a dependency
on the C library.
