vc里的malloc库函数是否保证返回对齐的内存地址？

??b我心

rt..

??b我心

搞清楚了，问这个问题是因为经常看到类似aligned_allocator的专用类．

malloc() is supposed to return a pointer that is sufficiently well aligned for any purpose. However, the meaning of 'any' is primarily for things like basic types - long, double, long double, long long. When you are doing more specialized things, like playing with graphics systems, they can need more stringent alignment than the rest of the system

游戏阿家

别用VC了,用这个
http://www.gnu.org/software/libtool/manual/libc/Aligned-Memory-Blocks.html

??b我心

那个32位下怎么是8byte对齐，4byte不就行了吗．．．

??b我心

我想了一下，这个问题可能不只跟cpu访问内存次数有关，也跟cpu的高速缓冲机制有关．
如果不是按照double来对齐的话，可能会刷新两条cache line．

望高手解答．