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

[ebotcazou at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50904

--- Comment #10 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-11-07 00:32:49 UTC ---
Created attachment 25731
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25731
Tentative fix

This enhances RTL PRE.  You need an up-to-date tree to apply it.

The other approaches are TER throttling and machine description fiddling.