digitalmars.D - Access to the CPU rotate instruction
- Munchgreeble bigfoot.com (22/26) Nov 22 2005 Whilst I'm thinking native CPU instructions, another very nice to have t...
Whilst I'm thinking native CPU instructions, another very nice to have that has been missing from every high level language I know... access to the CPU's built in rotate. At present, as I'm sure most know, various checksums which run like lightening in hardware are very time consuming in software and often depend on non-obvious looking code in order to get the speed up. Here's an old thread on the subject of rotate (from 2002): http://www.digitalmars.com/d/archives/7593.html In it we have: Mon, 19 Aug 2002 10:43:39 -0700 "Walter" <walter xx digitalmars.com> writes: "Mac Reiter" <Mac_member xx pathlink.com> wrote in message news:ajr3c5$140n$1 xx digitaldaemon.com...I was wondering if anyone else thought a rotate operator would be worththeeffort of adding to D. You don't need them very often, usually only for hashing, random number generation, encryption, or similar things, butgenerallywhen you do need them you need to be able to do them very quickly.I agree. I intend to add them in as "intrinsic" functions, not as an operator. Yay! =) Here's my plea: is it possible to add this at some point in the not *too* distant future? Meantime - thankyou soooo much for including the bit finding operations. I figured somebody would do a language with rotate in sooner or later, but I never dreamt I'd find a language with CPU native bit finding. Yipeee =) Thanks in advance Munch (very happy)
Nov 22 2005