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Re: alias slowdown?


On Fri, 2006-11-17 at 12:22 -0500, Andrew MacLeod wrote:
> I just tried compiling cplusplus_grammer.ii with mainline, checking
> disabled, and had to stop it after 30 minutes (use to be <50 seconds on
> my x86-linux box).  A quick check with GDB seems to show that its
> spending in inordinate amount of time in may_alias:
> 
> #0  0x0816d1ac in bitmap_ior_into (a=0x99916d8, b=0x98f60a0)
>     at /src/gcc/2006-11-16/gcc/gcc/bitmap.c:1167
> #1  0x083c8071 in set_union_with_increment (to=0x99916d8, from=0x98f60a0,
>     inc=0) at /src/gcc/2006-11-16/gcc/gcc/tree-ssa-structalias.c:715
> #2  0x083cacf4 in solve_graph (graph=0x9a11d10)
>     at /src/gcc/2006-11-16/gcc/gcc/tree-ssa-structalias.c:1721
> #3  0x083cbb7d in compute_points_to_sets (ai=0x8ccc200)
>     at /src/gcc/2006-11-16/gcc/gcc/tree-ssa-structalias.c:4846
> #4  0x08133ab9 in compute_may_aliases ()
>     at /src/gcc/2006-11-16/gcc/gcc/tree-ssa-alias.c:665
> 
> 
> If anyone has changed this recently, you might want to have a look.

Im seeing the same thing in all.i from 26854...  I had to kill the
process after 20 minutes.  It was in 'solve_graph' there as well.

Andrew


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