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0 pointsaraes2y ago0 comments

Does anybody happen to know what SQR algorithm BBC Basic uses? http://www.bbcbasic.co.uk/bbcwin/manual/bbcwin7.html#printha... does not seem to have the actual algorithm.

Intel's optimization manual has suggestions for fast versions at 15.12.3 (recommended by @James https://stackoverflow.com/a/2637823/10981777) Don't look especially long to implement for 22-bit approximation.

https://software.intel.com/content/www/us/en/develop/downloa...

Also, what's the SQRD? Not finding that referred to anywhere.

0 comments

Sharlin2y ago

SQRD is just SQR D :)

araesOP2y ago

Thanks. So much more of that code makes sense now. IFD, SGNU, FORN, FORM. FORM especially. So many codes now have the word FORM as a special word.

What a nightmare to read though if you don't know what it's supposed to be written like. Is it a: "FORM=" or a "FOR M=" ? Is it: "S GNU:G", "SG NU:G", "SGN U:G"? SQRD totally looks like some special kind of square root implementation.

Sharlin2y ago

Yeah, early BASICs tended to let you skip the spaces, and in fact it sometimes did have a measurable effect on parsing/execution speed. And of course on file size too… Additionally, at least C64 Basic had two-character shorthands for all keywords.

j / k navigate · click thread line to collapse

0 pointsaraes2y ago0 comments

Does anybody happen to know what SQR algorithm BBC Basic uses? http://www.bbcbasic.co.uk/bbcwin/manual/bbcwin7.html#printha... does not seem to have the actual algorithm.

https://software.intel.com/content/www/us/en/develop/downloa...

Also, what's the SQRD? Not finding that referred to anywhere.

0 comments

Sharlin2y ago

SQRD is just SQR D :)

araesOP2y ago

Thanks. So much more of that code makes sense now. IFD, SGNU, FORN, FORM. FORM especially. So many codes now have the word FORM as a special word.

Sharlin2y ago

j / k navigate · click thread line to collapse