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alias slowdown?
- From: Andrew MacLeod <amacleod at redhat dot com>
- To: gcc mailing list <gcc at gcc dot gnu dot org>
- Date: Fri, 17 Nov 2006 12:22:06 -0500
- Subject: alias slowdown?
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.
Andrew