[Bug fortran/37131] inline matmul for small matrix sizes

[tkoenig at gcc dot gnu dot org]

------- Comment #8 from tkoenig at gcc dot gnu dot org  2010-05-14 09:15 -------
New timings, on x86_64-unknown-linux-gnu.  I split off the "invalidate"
subroutine to make sure the optimizers don't optimize this out:

ig25@linux-fd1f:/tmp> gfortran -O3 matmul.f90 invalidate.f90
ig25@linux-fd1f:/tmp> time ./a.out
 matmul =    11.100311      s
 subroutine with explicit interface:    2.0216932      s
 unrolled subroutine with explicit interface:    1.9317064      s
 inline with sum   1.9087105      s

real    0m16.971s
user    0m16.959s
sys     0m0.005s


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37131