This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug tree-optimization/26830] [4.1/4.2 Regression] Insane amount of compile-time / memory needed at -O1 and up
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 23 Mar 2006 21:03:17 -0000
- Subject: [Bug tree-optimization/26830] [4.1/4.2 Regression] Insane amount of compile-time / memory needed at -O1 and up
- References: <bug-26830-10053@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #5 from rguenth at gcc dot gnu dot org 2006-03-23 21:03 -------
Now, with -O -fno-tree-salias we have
tree copy propagation : 4.30 ( 1%) usr 0.06 ( 0%) sys 4.48 ( 1%) wall
1076 kB ( 0%) ggc
tree SSA rewrite : 280.55 (76%) usr 0.44 ( 3%) sys 287.70 (69%) wall
8254 kB ( 3%) ggc
tree SSA incremental : 25.32 ( 7%) usr 0.24 ( 2%) sys 26.91 ( 6%) wall
4307 kB ( 1%) ggc
TOTAL : 366.85 15.64 419.93
305294 kB
eh...!? now it would be interesting to know what pass caused this.
CPU: P4 / Xeon, speed 2799.93 MHz (estimated)
Counted UOPS_RETIRED events (retired uops) with a unit mask of 0x01 (count
marked uops which are non-bogus) count 45000
samples % image name symbol name
6902 67.2055 cc1plus rewrite_update_phi_arguments
438 4.2648 cc1plus update_ssa
314 3.0574 cc1plus rewrite_update_init_block
200 1.9474 cc1plus walk_dominator_tree
149 1.4508 cc1plus compute_global_livein
138 1.3437 cc1plus next_dom_son
121 1.1782 cc1plus bitmap_bit_p
111 1.0808 cc1plus delete_update_ssa
108 1.0516 no-vmlinux (no symbols)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26830