[Bug rtl-optimization/50904] Induct benchmark of polyhedron slows down 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 #5 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-10-30 11:34:15 UTC ---
Created attachment 25666
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25666
Further reduced test for induct.f90

The reduced test contains a single et of nested loops in
mutual_ind_quad_cir_coil.  Using the main program in
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34265#c34 (induct_red.f90), the
execution time is 2.0s when induct_qc.f90 is compiled with -Ofast and 1.8s when
it is compiled with -fprotect-parens -Ofast.