gcc using clobbered register as input with inline assembly

[Timur Tabi]

** Reply to message from "Zack Weinberg" <zackw@stanford.edu> on Mon, 26 Mar
2001 10:20:21 -0800


> > According to the documentation, because I specified eax and edx as
> > clobbered registers, gcc should not be using them as inputs or outputs. 
> > But that's exactly what's happening in my case.
> 
> Clobbers happen *after* the asm completes.  You have to do the moves
> separately, or let the compiler do them for you, e.g:

I don't understand this.  What good is it to specify clobbers if they happen
after the assembly?  I have no control over what happens outside the assembly
code!  I thought the point behind clobbers was to inform the compiler of
specific registers that my assembly code modifies.


-- 
Timur Tabi - ttabi@interactivesi.com
Interactive Silicon - http://www.interactivesi.com

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