Use of register 17 on x86

[Richard Henderson]

On Sun, Feb 18, 2001 at 06:26:08PM -0500, Richard Kenner wrote:
> Maybe, but the downside is that you have the explicit clobber of the register
> in many arithmetic insns, making it harder to optimize them because you
> can't just insert one without knowing if reg 17 is dead there.

Yep.  In local optimizations, it's easy enough to work around this.
Global opts do present a problem -- this is one of the reasons why
having multiple levels of IL is a good idea.


r~