[PATCH] var-tracking.c speedups

[Michael Matz]

Hi,

On Tue, 23 Jun 2009, Jakub Jelinek wrote:

> BTW, var-tracking.c calls rtx_equal_p in a weird way:
>                   if ((REG_P (vui[jj].lc->loc)
>                        && REG_P (node->loc)
>                        && REGNO (vui[jj].lc->loc) == REGNO (node->loc))
>                       || rtx_equal_p (vui[jj].lc->loc, node->loc))
> If that is because it doesn't care about REG mode, when it already knows
> that it is a REG it shouldn't call rtx_equal_p at all.

It has to ignore the mode.  A hardreg contains some new value no matter 
which mode it was in and no matter what mode the value currently in that
hardreg had.


Ciao,
Michael.