Raymond Toy <[EMAIL PROTECTED]> writes: > Isn't this because you really can't "allocate" registers because the > FPU is a stack? I also thought this didn't hurt much because the > Pentium does register renaming on the FPU so those fxch instructions > are very fast?
On newer processors the FPU stack is mapped to the MMX registers and you could allocate the corresponding MMX register. MMX registers could perhaps also be used as a fast cache, to avoid some spilling. helmut.
