[Bug middle-end/40106] Time increase for the Polyhedron test air.f90 due to bad optimization

[dominiq at lps dot ens dot fr]

------- Comment #22 from dominiq at lps dot ens dot fr  2009-08-28 12:23 -------
For the original air.f90 I get:

[ibook-dhum] lin/test% gfc -m64 -O2 -funsafe-math-optimizations
-fno-strict-overflow air.f90
[ibook-dhum] lin/test% time a.out > /dev/null
9.572u 0.055s 0:09.66 99.5%     0+0k 0+9io 1pf+0w
[ibook-dhum] lin/test% gfc -m64 -O2 -funsafe-math-optimizations air.f90
[ibook-dhum] lin/test% time a.out > /dev/null
8.446u 0.046s 0:08.50 99.7%     0+0k 0+8io 0pf+0w
[ibook-dhum] lin/test% gfc -m64 -O2 -funsafe-math-optimizations air.f90

Commenting the write in line 139, it becomes

[ibook-dhum] lin/test% time a.out > /dev/null
10.083u 0.052s 0:10.15 99.8%    0+0k 0+7io 0pf+0w
[ibook-dhum] lin/test% gfc -m64 -O2 -funsafe-math-optimizations
-fno-strict-overflow air.f90
[ibook-dhum] lin/test% time a.out > /dev/null
9.531u 0.045s 0:09.58 99.8%     0+0k 0+7io 0pf+0w


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40106