------- Comment #2 from ramana dot radhakrishnan at arm dot com 2009-07-01
09:13 -------
Subject: Re: New: unnecessary conversion from unsigned
byte load to signed byte load
> Unfortunately in thumb mode, loading a signed byte costs more than loading an
> unsigned byte and comparing with 0 has same cost as comparing with 0x7F.
I don't know of any core where loading a signed byte is more expensive
than unsigned byte in thumb mode. What did you have in mind ?
I suspect what you mean is that the sign extension here is not required
and we could get away with ldrb.
>
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40603
