adding a new register type to i386.h, and add spill/fill support

[Ian Lance Taylor]

Tyler Anderson <tyleranderson5@yahoo.com> writes:

> I've already added the new type to i386.h, however, I
> think I'm missing something in the #define
> REG_CLASS_CONTENTS section. Could anyone point me to
> more documentation about what each bit means? We need
> to add a new register type, and extend the # of
> existing registers. Extending the # of a register
> seems easy, but it's unclear to me if it has been done
> right since I don't know what each bit set in the
> REG_CLASS_CONTENTS define is.

Well, there is documentation in the internals manual, of course.

Each bit in each entry in REG_CLASS_CONTENTS corresponds to a
particular register.  Which register it means is target specific, but
you can figure it out based on, e.g., REGISTER_NAMES.  For example,
for the i386, bit 0 is ax, bit 1 is dx, etc.

Ian