Re: [patch] Speed up operand_equal_p during SSA optimizations.

[Kazu Hirata <kazu at cs dot umass dot edu>]

Hi Roger,

> int
> operand_equal_for_phi_arg_p (tree arg0, tree arg1)
> {
>   if (arg0 == arg1)
>     return 1;
>   if (TREE_CODE (arg0) == SSA_NAME || TREE_CODE (arg1) == SSA_NAME)
>     return 0;
>   return operand_equal_p (arg0, arg1, 0);
> }

Your approach seems to have the biggest impact among several things
I've tried.

Here is a timing in seconds for 5 runs of "./cc1 -quiet -O2
-fomit-frame-pointer -o /dev/null insn-attrtab.i".

      original patched
real:  195.931 192.715 (1.668% down)
user:  191.533 189.329 (1.164% down)

I'll test this and submit it for review.  I have several patches in my
queue, so I haven't got to testing any operand_equal_p patch, yet. :-(

Kazu Hirata