This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug rtl-optimization/50904] [4.7 regression] pessimization when -fno-protect-parens is enabled by -Ofast
- From: "dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 05 Dec 2011 10:12:39 +0000
- Subject: [Bug rtl-optimization/50904] [4.7 regression] pessimization when -fno-protect-parens is enabled by -Ofast
- Auto-submitted: auto-generated
- References: <bug-50904-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50904
--- Comment #41 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-12-05 10:12:39 UTC ---
Using --param lim-expensive=1 when compiling induct.f90 does not change the
timing, as for today (r181994):
gfc -Ofast induct.f90
-> 14.62s
gfc -Ofast induct.f90 --param lim-expensive=1 ->
14.61s
gfc -fprotect-parens -Ofast induct.f90
-> 14.11s
gfc -fprotect-parens -Ofast induct.f90 --param lim-expensive=1 -> 14.12s
(a ~0.15s improvement over the timing in comment #1).