GPGPU Programming for Games and Science

98 GPGPU Programming for Games and Science

}

m12 8 number ;

} ;

The general rule for alignment of a struct is that it is equal to the largest

alignment of its components. In this case,

m128 is 16-byte aligned which

guarantees that

MyTuple4 is 16-byte aligned.

The alignment of the struct is based on stack location. In the

MyTuple4

version with m128 number,aMyTuple4 object declared on the stack is 16-

byte aligned; that is, its address is a multiple of 16 bytes. However, if you

were to dynamically allocate the object using

new or malloc, the address is not

guaranteed to be 16-byte aligned. Fortunately with Microsoft Visual Studio

2013, warnings are generated ...