inline assembler: can't set clobbering for input register

Cedric Roux cedric.roux@acri-st.fr
Thu May 6 12:53:00 GMT 2010


Марк Коренберг wrote:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43998
> 
> Please answer to my last question (comment #5) in this bug report. Thanks.
> I consider this is a bug in gcc inline assembler.
> 

that's funny, I had the exact same problem than yours.
I finally ended up using unused variables, like everyone
else.
I agree with you that it's a bit ugly, but I guess
we have to live with that. (The asm syntax is not
particularly sexy either.)
By the way I suspect the compiler to do some funky
optimizations afterwards so apart from ugliness I
doubt we lose something.
Welcome in reality! :-)



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