[Bug lto/57290] New: [4.9 Regression] After r198333 the aermod runtime is ~10% slower when compiled with -fprotect-parens and -flto

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57290

            Bug ID: 57290
           Summary: [4.9 Regression] After r198333 the aermod runtime is
                    ~10% slower when compiled with -fprotect-parens and
                    -flto
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dominiq at lps dot ens.fr
                CC: rguenth at gcc dot gnu.org

After r198333, the aermod runtime is more than 10% slower when compiled with
-fprotect-parens and -flto:

(1) -Ofast -funroll-loops
(2) -fprotect-parens -Ofast -funroll-loops
(3) -Ofast -funroll-loops -fwhole-program -flto
(4) -fprotect-parens -Ofast -funroll-loops -fwhole-program
(5) -fprotect-parens -Ofast -funroll-loops -fwhole-program -flto

revision:   198332  198333

(1)          18.11   17.74
(2)          17.70   17.61
(3)          17.66   18.34
(4)          18.47   18.49
(5)          17.80   20.70