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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/64099] [5 Regression] ~15% runtime increase for fatigue.f90.
Date: Fri, 28 Nov 2014 15:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64099

--- Comment #6 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
The second runtime increase (with '-Ofast', the only one with '-O3
-ffast-math') is due to r217827

[Book15] lin/test% /opt/gcc/gcc4.10p-217825p1/bin/gfortran -Ofast
-fwhole-program fatigue.f90
[Book15] lin/test% time a.out > /dev/null
[Book15] lin/test% time a.out > /dev/null
1.498u 0.001s 0:01.49 100.0%    0+0k 0+1io 0pf+0w
[Book15] lin/test% /opt/gcc/gcc4.10p-217827p1/bin/gfortran -Ofast
-fwhole-program fatigue.f90
[Book15] lin/test% time a.out > /dev/null
1.622u 0.001s 0:01.62 100.0%    0+0k 0+0io 0pf+0w
[Book15] lin/test% /opt/gcc/gcc4.10p-217825p1/bin/gfortran -O3 -ffast-math
-fwhole-program fatigue.f90
[Book15] lin/test% time a.out > /dev/null
2.663u 0.002s 0:02.66 100.0%    0+0k 0+2io 0pf+0w
[Book15] lin/test% /opt/gcc/gcc4.10p-217827p1/bin/gfortran -O3 -ffast-math
-fwhole-program fatigue.f90
[Book15] lin/test% time a.out > /dev/null
2.964u 0.001s 0:02.96 100.0%    0+0k 0+1io 0pf+0w