Re: push and pop of FPU stack ; record st registers

[paawan oza <paawan1982@yahoo.com>]

yes. I can record all st0 to st7 registers. that is not a problem.
but, at every insn which push/pop FPU stack, if we record all st0 to st7, we will be occupying too much of record memory. 
(memory usage will be more for our records)

I was just thinking of optimizing it with some cache.
but at the moment I think I can go ahead with plain implementation of recording st0 to st7.

Regards,
Oza.



--- On Sat, 5/23/09, Hui Zhu <teawater@gmail.com> wrote:

> From: Hui Zhu <teawater@gmail.com>
> Subject: Re: push and pop of FPU stack ; record st registers
> To: "paawan oza" <paawan1982@yahoo.com>
> Cc: "gdb ml" <gdb@sourceware.org>
> Date: Saturday, May 23, 2009, 9:34 AM
> You cannot record st0 to st7?
> 
> Hui
> 
> On Fri, May 22, 2009 at 23:43, paawan oza <paawan1982@yahoo.com>
> wrote:
> >
> > Hi,
> >
> > the instructions such as;
> > fld1, which pushes fpu stack and insn faddp pops
> registers stack,
> > we need to record all st0 to st7 registers. because
> all will be changed on push/pop.
> > as pushing/popping changes all the registers, at such
> insns (which does push/pop) we record all st0 to st7
> registers that may affect the performance.
> >
> > currently I can not think of any alternative
> > (may be we cache registers all the time and we record
> only those which may change) but by doing that we only save
> memory. performance is still question :(
> >
> > Does anybody have any other suggestion ?
> >
> > Regards,
> > Oza.
> >
> >
> >
> >
>