Is there an option(compile/build time?) to tell GCC to use as few registers as possible?
There's always the manual:
@item [EMAIL PROTECTED]
@opindex ffixed
Treat the register named @var{reg} as a fixed register; generated code
should never refer to it (except perhaps as a stack pointer, frame
pointer or in some other fixed role).@var{reg} must be the name of a register. The register names accepted
are machine-specific and are defined in the @code{REGISTER_NAMES}
macro in the machine description macro file.This flag does not have a negative form, because it specifies a three-way choice.
If you fix all but 4 registers, then the compiler will only use the remaining 4. Extra credit if your code compiles with just 2 registers left!
