Jeroen Demeyer <jdemeyer@xxxxxxxxxxxxx> writes:
> This is the full asm statement:
> asm("# number_t& number_t::operator>>=(unsigned char s)\n"
> " shrdl %6, %4, %3\n"
> " movl %3, %0\n"
> " movl %5, %2\n"
> " shrdl %6, %2, %1\n"
> " shrl %6, %2\n"
> : "=&rm" (n0), "=&r" (n1), "=&r" (n2)
> : "2" (n0), "1" (n1), "g" (n2), "cI" (s)
> );
>
> The code generated is the following:
> shrdl %cl, %esi, %eax
> movl %eax, -4384(%ebp)
> movl -4384(%ebp), %eax
> shrdl %cl, %eax, %esi
> shrl %cl, %eax
>
> As you can see, %0 and %5 both become -4384(%ebp).
> See attachment for the output from -dg.
Thanks for the details. Unfortunately, I am no wiser. As far as I
can tell, this should work correctly. Either you've found a bug, or
I'm missing something.
If you like, and you want to help others avoid this problem, please
file a bug report with the preprocessed source code and command line
at http://gcc.gnu.org/bugzilla/ . For more information about filing
bug reports see http://gcc.gnu.org/bugs.html .
If you just want to fix it for yourself change constraint 0 to "=&r"
or change constraint 5 to "r".
Ian
