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Re: [avr-gcc-list] Re: C vs. assembly performance

From: Parthasaradhi Nayani
Subject: Re: [avr-gcc-list] Re: C vs. assembly performance
Date: Sat, 28 Feb 2009 03:21:46 -0800 (PST)

> From: Nicholas Vinen <address@hidden>

 For example, things like "unsigned char x, y;
> x = y>>4" could
> use the nibble swap instruction rather than four shifts,
> and things like

Shifting a byte or int right or left must push in 00s from the other side so 
swapping a nibble is not the right thing to do. So is the case with other 
examples. Correct me if I am wrong.



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