[Bug fortran/48636] Enable more inlining with -O2 and higher

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48636

--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-04-17 10:23:03 UTC ---
As shown by the following results it seems that --param max-inline-insns-auto=*
is the way to go.

Date & Time     : 17 Apr 2011 11:22:05
Test Name       : pbharness
Compile Command : gfc %n.f90 -Ofast -funroll-loops -ftree-loop-linear
-fomit-frame-pointer --param max-inline-insns-auto=400 -fwhole-program -flto
-fstack-arrays -o %n
Benchmarks      : ac aermod air capacita channel doduc fatigue gas_dyn induct
linpk mdbx nf protein rnflow test_fpu tfft
Maximum Times   :      300.0
Target Error %  :      0.200
Minimum Repeats :     2
Maximum Repeats :     5

   Benchmark   Compile  Executable   Ave Run  Number   Estim
    Name    (secs)     (bytes)    (secs) Repeats   Err %
   ---------   -------  ----------   ------- -------  ------
      ac      8.07       54576      8.11       2  0.0062
      aermod    175.22     1472624     18.83       2  0.1647
     air     25.65       89992      6.78       5  0.1871
    capacita     14.02      109536     40.36       2  0.0483
     channel      3.11       34448      2.94       5  0.6012
       doduc     29.46      224584     27.44       2  0.0437
     fatigue      9.85       77032      2.74       2  0.0365
     gas_dyn     26.09      144112      4.68       5  0.6928
      induct     24.32      189696     14.24       2  0.1193
       linpk      3.13       21536     21.69       2  0.0254
    mdbx      9.18       84776     12.55       2  0.0678
      nf     34.14      124640     18.38       2  0.1034
     protein     28.14      155624     35.48       2  0.0789
      rnflow     43.93      204176     26.70       2  0.0262
    test_fpu     21.90      141696     11.18       2  0.0045
    tfft      1.71       22072      3.29       5  0.1369

Geometric Mean Execution Time =      11.60 seconds

================================================================================

Date & Time     : 17 Apr 2011 11:50:20
Test Name       : pbharness
Compile Command : gfc %n.f90 -Ofast -funroll-loops -ftree-loop-linear
-fomit-frame-pointer -finline-limit=600 -fwhole-program -flto -fstack-arrays -o
%n
Benchmarks      : ac aermod air capacita channel doduc fatigue gas_dyn induct
linpk mdbx nf protein rnflow test_fpu tfft
Maximum Times   :      300.0
Target Error %  :      0.200
Minimum Repeats :     2
Maximum Repeats :     5

   Benchmark   Compile  Executable   Ave Run  Number   Estim
    Name    (secs)     (bytes)    (secs) Repeats   Err %
   ---------   -------  ----------   ------- -------  ------
      ac      8.06       54576      8.11       2  0.0062
      aermod    175.54     1480632     18.92       2  0.0106
     air     25.36       89992      6.76       2  0.0740
    capacita     13.95      109536     40.32       2  0.0161
     channel      3.13       34448      2.95       5  0.1703
       doduc     27.31      212280     27.18       2  0.0331
     fatigue      9.82       77032      2.74       2  0.0182
     gas_dyn     24.86      144112      4.67       5  0.3052
      induct     24.25      189696     14.21       2  0.0035
       linpk      2.55       21536     21.69       2  0.0023
    mdbx      9.17       84776     12.53       2  0.0239
      nf     34.21      124640     18.41       4  0.1634
     protein     28.01      155624     35.46       2  0.0310
      rnflow     38.11      183696     26.74       2  0.0037
    test_fpu     19.63      141720     10.84       2  0.0323
    tfft      1.69       22072      3.29       2  0.0152

Geometric Mean Execution Time =      11.57 seconds

================================================================================