Author: Robert Hyatt
Date: 11:12:18 03/30/04
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On March 29, 2004 at 21:44:36, Russell Reagan wrote: >On March 29, 2004 at 14:36:08, Robert Hyatt wrote: > >> >> >>That reminds me of my first attempt at "bit fields" in C 25 years ago. Signed >>bit fields to be precise. Ugliest assembly code I ever examined, trying to >>figure out why it was so slow. Puked for days... > >Are unsigned bit fields slow? Obviously they aren't slow due to any sign >extension, but it seems like I've heard they aren't recommended where >performance counts. Maybe whoever I heard that from was using the signed variety >though. How will you avoid sign-extension? IE 8 4--bit values in 1 word. How do I use the value in bits 4-7 without shifting/anding/sign-extending???
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