http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56439
Chung-Ju Wu <jasonwucj at gmail dot com> changed:
What |Removed |Added
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CC| |jasonwucj at gmail dot com
--- Comment #5 from Chung-Ju Wu <jasonwucj at gmail dot com> 2013-02-25
06:32:05 UTC ---
(In reply to comment #4)
> Wouldn't that be a reason /against/ doing this:
>
> mov r24,r4
> lsl r24
> mov r4,r24
>
> instead of just lsl r4?
Just guess...
Is that possibly related to zero_extend RTL transformation?
Either in gcc optimization, or the design of machine description?
Try to use this declaration (use 'int' instead of 'char'):
register unsigned int foo asm ("r4");
Is there any difference on code generation?
