Clarification Req: Regarding "+m" constraints in inline asm

[Jim Wilson]

Ashok.A wrote:
> I need clarification regarding the "+m" constraints.
> I heard that "+m" constraints cannot be used
> in "inline asm". Is it true?

Current sources will give a warning for both of your examples.  Neither 
read-write "+" or matching "1" constraints should be used with mems in 
an asm.  These both require that the operands are the same, but the 
compiler is not able to guarantee this for mems.  We can only make this 
work for register constraints.

Try changing the lw to use %2 instead of %1, and then use "m" for the 
second operand.  I think this is the way it is supposed to work nowadays.
-- 
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com