[rz@linux-m68k.org: Re: m68k, extendqidi2 problem]

[Andreas Schwab]

Jim Wilson <wilson@specifixinc.com> writes:

> Perhaps the 68020 case was left alone to avoid the risk of breaking it. 
> Or maybe it was left alone because smi/ext is a lot easier to understand
> than movl/smi.

"move%.b %1,%R0;extb%.l %R0;move%.l %R0,%0;smi %0" should be at least as
fast as "move%.b %1,%R0;extb%.l %R0;smi %0;extb%.l %0" whereever it is
applicable, but the former is faster at least on 68020 and 68030.

Andreas.

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Andreas Schwab, SuSE Labs, schwab@suse.de
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