* H. Peter Anvin ([EMAIL PROTECTED]) wrote: > Mathieu Desnoyers wrote: > - Use "=g" constraint for char immediate value inline assembly. > > "=g" is the same as "=rmi" which is inherently bogus. In your actual code > you use "=r", the correct constraint is "=q". >
Hi Peter, Yup, =g wasn't what I was looking for at all, the header comment is bogus. From http://gcc.gnu.org/onlinedocs/gcc/Simple-Constraints.html#Simple-Constraints `r' A register operand is allowed provided that it is in a general register. From http://gcc.gnu.org/onlinedocs/gcc/Machine-Constraints.html#Machine-Constraints Intel 386 config/i386/constraints.md q Any register accessible as rl. In 32-bit mode, a, b, c, and d; in 64-bit mode, any integer register. I am worried that "=q" might exclude the si and di registers in 32-bit mode. What exactly is wrong with "=r" ? > -hpa -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
