> As "tmp" is not referenced after the assembly, I removed it from the
> output list and added it to the input list. This appears to fix it. Do
> you see anything wrong with removing tmp from the output list?
Yes. You've told the compiler that the value in tmp hasn't changed and so it
is free to re-use it.
The way to do it is just to use the "=" constraint and split the "d" register
value:
"# ending __up_read\n"
- : "+m"(sem->count), "+d"(tmp)
- : "a"(sem)
+ : "+m"(sem->count), "=d"(tmp)
+ : "a"(sem), "1"(tmp)
: "memory", "cc");
However, if I remember rightly, this has some other adverse side effects on
the compiler:-( But it is the only other way to do it.
David
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