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ASM and C question

General and Gameplay Programming Programming

Started by Ancient Spirit September 11, 2005 06:42 PM

2 comments, last by Ancient Spirit 18 years, 7 months ago

Ancient Spirit

151

Author

September 11, 2005 06:42 PM

I was wondering... is it possible to.. let's say copy: int arr1[50]; int arr2[20]; To cope the first 20 in the arr1 to the arr2 using __asm in visual studio?

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SiCrane

11,840

September 11, 2005 07:15 PM

Yes, but there's not much point. If you use std::copy() the compiler will likely generate the same or better code than you would using assembly.

doynax

850

September 11, 2005 07:17 PM

Try this:

__asm { lea esi,arr1 lea edi,arr2 mov ecx,20 rep movsd};

Still.. It's pretty pointless in itself, an intrinsic memcpy should be equally fast (probably even faster since it can interleave the instructions freely with nearby code).