Steven Rostedt wrote:
Should use a "b" constraint for %2, or you could get r0.
I will make an updated patch.
Or, use an "m"
constraint with %U2%X2 after the lwz/stw.
The 'b' seems easier ;-)
The advantage of the latter is that it allows GCC to choose indexed or
update instructions -- but that's merely an optimization. Switching to
"b" is enough to avoid the potential bug.
%1 also needs to be an early clobber.
Not exactly sure what you mean by the above.
%1 is written to before some inputs are consumed, so you need to use
"=&r" rather than "=r" so that GCC won't use the same register for both.
-Scott
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