clobber list in inline assembly for calls

[Ian Lance Taylor]

Daniel Mierswa <impulze@impulze.org> writes:

> I was wondering which registers I have to clobber or which special
> strings I have to put into the clobber list if all I'm going to do is:
>
> asm("call %0;" ::"m"(addr_of_myfunc));
>
> As I can't tell what the function is doing I may have to clobber all
> registers or am I wrong?
> I had in mind to clobber "cc" plus "eax", "ecx", "edx" which are by the
> i386 ABI not preserved for the caller.

You are correct: you have to list all the caller-saved registers in the
clobber list.  On 32-bit x86 this is all the registers other than %ebp,
%ebx, %edi and %esi.

Ian