[Bug rtl-optimization/50904] [4.7 regression] pessimization when -fno-protect-parens is enabled by -Ofast

[dominiq at lps dot ens.fr]

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).