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Programming > Assembly x86 > Re: Any more gr...
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Re: Any more graceful way to saturate adds?

by Terence <spamtrap@[EMAIL PROTECTED] > Apr 11, 2008 at 04:40 PM

I wouldn't do it that way.
I would add the two supposedly unsigned 8-bit integers and test the 9
th bit for 1, which if present, the addition has overflowed.

Note that any non-overflow result of 255 is for your purposes
indistinguishable from an overflow,
So you just add, test 9th bit, jump around or load or OR 255h.




 39 Posts in Topic:
Any more graceful way to saturate adds?
 Jim Leonard <spamtrap  2008-04-10 14:59:55 
Re: Any more graceful way to saturate adds?
 (Dick Wesseling) <spam  2008-04-11 02:32:55 
Re: Any more graceful way to saturate adds?
 Terje Mathisen <spamt  2008-04-11 09:41:42 
Re: Any more graceful way to saturate adds?
 Jim Leonard <spamtrap  2008-04-11 11:05:19 
Re: Any more graceful way to saturate adds?
 Terence <spamtrap@[EM  2008-04-11 16:40:10 
Re: Any more graceful way to saturate adds?
 Terence <spamtrap@[EM  2008-04-11 23:28:22 
Re: Any more graceful way to saturate adds?
 "Wolfgang Kern"  2008-04-12 12:51:54 
Re: Any more graceful way to saturate adds?
 Robert Redelmeier <red  2008-04-12 19:29:18 
Re: Any more graceful way to saturate adds?
 Richard Russell <spam  2008-04-12 13:52:03 
Re: Any more graceful way to saturate adds?
 Terje Mathisen <spamt  2008-04-13 15:31:59 
Re: Any more graceful way to saturate adds?
 Terence <spamtrap@[EM  2008-04-12 17:03:07 
Re: Any more graceful way to saturate adds?
 "Rod Pemberton"  2008-04-12 23:06:56 
Re: Any more graceful way to saturate adds?
 "Rod Pemberton"  2008-04-12 23:10:57 
Re: Any more graceful way to saturate adds?
 Terje Mathisen <spamt  2008-04-13 15:00:06 
Re: Any more graceful way to saturate adds?
 "Rod Pemberton"  2008-04-13 11:27:29 
Re: Any more graceful way to saturate adds?
 "Alexei A. Frounze&q  2008-04-13 17:19:25 
Re: Any more graceful way to saturate adds?
 "Rod Pemberton"  2008-04-14 02:41:38 
Re: Any more graceful way to saturate adds?
 Jim Leonard <spamtrap  2008-04-14 06:58:12 
Re: Any more graceful way to saturate adds?
 "Alexei A. Frounze&q  2008-04-14 03:39:12 
Re: Any more graceful way to saturate adds?
 pete <spamtrap@[EMAIL   2008-04-15 05:11:19 
Re: Any more graceful way to saturate adds?
 Jim Leonard <spamtrap  2008-04-15 07:30:34 
Re: Any more graceful way to saturate adds?
 pete <spamtrap@[EMAIL   2008-04-17 17:05:43 
Re: Any more graceful way to saturate adds?
 Terje Mathisen <spamt  2008-04-17 13:14:08 
Re: Any more graceful way to saturate adds?
 Danjel McGougan <spam  2008-04-18 02:31:30 
Re: Any more graceful way to saturate adds?
 Terje Mathisen <spamt  2008-04-18 11:21:01 
Re: Any more graceful way to saturate adds?
 dave <spamtrap@[EMAIL   2008-04-18 13:57:11 
Re: Any more graceful way to saturate adds?
 Jim Leonard <spamtrap  2008-04-21 07:23:39 
Re: Any more graceful way to saturate adds?
 Jim Leonard <spamtrap  2008-04-21 07:33:56 
Re: Any more graceful way to saturate adds?
 Esra Sdrawkcab <spamt  2008-04-21 20:07:15 
Re: Any more graceful way to saturate adds?
 Terje Mathisen <spamt  2008-04-22 11:01:06 
Re: Any more graceful way to saturate adds?
 Esra Sdrawkcab <spamt  2008-04-23 08:20:41 
Re: Any more graceful way to saturate adds?
 "H. Peter Anvin"  2008-06-02 09:43:53 
Re: Any more graceful way to saturate adds?
 Terje Mathisen <spamt  2008-06-02 19:53:52 
Re: Any more graceful way to saturate adds?
 aku ankka <spamtrap@[  2008-04-22 00:38:05 
Re: Any more graceful way to saturate adds?
 Terje Mathisen <spamt  2008-04-22 11:03:00 
Re: Any more graceful way to saturate adds?
 aku ankka <spamtrap@[  2008-04-22 23:43:47 
Re: Any more graceful way to saturate adds?
 Jim Leonard <spamtrap  2008-05-01 13:13:06 
Re: Any more graceful way to saturate adds?
 Terje Mathisen <spamt  2008-05-02 09:11:22 
Re: Any more graceful way to saturate adds?
 pete <spamtrap@[EMAIL   2008-05-02 04:38:05 

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tan12V112 Sat Jul 26 2:03:20 CDT 2008.