[LLVMdev] darwin llvm-gfortran Polyhedron 2005 results

[Bob Wilson]

[CCing Dale since this was his change, not mine]

The change in 81455 fixes a compiler crash.  It doesn't happen very often, but I can't imagine we would want to back that out.  Fixing it would be a more reasonable solution.  From a quick look at it, the problem is that gcc/config/darwin-c.c is registering va_opt for GC.  When you build for Fortran, darwin-c.o is not linked so the GC gets confused somehow.

On Apr 8, 2010, at 6:25 AM, Jack Howarth wrote:

> On Wed, Apr 07, 2010 at 09:54:36PM -0700, Chris Lattner wrote:
>> 
>> On Apr 7, 2010, at 8:41 PM, Jack Howarth wrote:
>> 
>>> Building the current release 2.7 branch on x86_64-apple-darwin10
>>> with r81455 reverted, I get the following Polyhedron 2005 benchmark
>>> results (with no test failures)...
>> 
>> Very nice!  A 14% speedup on a benchmark we don't tune for isn't bad.  I imagine that there are several easy wins you could get on it if you were interested in analyzing the performance.  I don't think that anyone has done *any* llvm-gfortran perf work.
>> 
>> -Chris
> 
> Chris,
>   How essential is r81455 to the llvm-gcc4.2-2.7 release? Can we regress it
> out for 2.7? I've tried all of the suggestions in...
> 
> http://llvm.org/bugs/show_bug.cgi?id=6778
> 
> from Duncan for moving va_opt into darwin.c as an extern. While this
> works at first glance, it destablizes the parallel make. Regressing r81455
> doesn't appear to cause any problems.
>                  Jack
> 
>> 
>>> 
>>> ================================================================================
>>> Date & Time     :  7 Apr 2010 22:24:16
>>> Test Name       : llvm_gfortran_lin_p4
>>> Compile Command : llvm-gfortran -ffast-math -funroll-loops -msse3 -O3 %n.f90 -o %n
>>> Benchmarks      : ac aermod air capacita channel doduc fatigue gas_dyn induct linpk mdbx nf protein rnflow test_fpu tfft
>>> Maximum Times   :     2000.0
>>> Target Error %  :      0.100
>>> Minimum Repeats :    10
>>> Maximum Repeats :   100
>>> 
>>>  Benchmark   Compile  Executable   Ave Run  Number   Estim
>>>       Name    (secs)     (bytes)    (secs) Repeats   Err %
>>>  ---------   -------  ----------   ------- -------  ------
>>>         ac      0.34       10000     12.85      10  0.0067
>>>     aermod     20.01       10000     15.42      10  0.0076
>>>        air      1.52       10000      7.50      12  0.0934
>>>   capacita      0.58       10000     45.67      10  0.0152
>>>    channel      0.41       10000      2.19      10  0.0365
>>>      doduc      2.29       10000     29.08      10  0.0140
>>>    fatigue      1.02       10000      8.83      10  0.0582
>>>    gas_dyn      0.77       10000     13.12      21  0.0909
>>>     induct      2.54       10000     24.22      10  0.0096
>>>      linpk      0.28       10000     15.67      10  0.0343
>>>       mdbx      0.79       10000     12.09      10  0.0070
>>>         nf      0.33       10000     30.10      12  0.0751
>>>    protein      1.10       10000     42.02      10  0.0100
>>>     rnflow      1.53       10000     32.00      10  0.0214
>>>   test_fpu      1.28       10000     11.73      10  0.0446
>>>       tfft      0.24       10000      2.16      13  0.0988
>>> 
>>> Geometric Mean Execution Time =      14.07 seconds
>>> 
>>> ================================================================================
>>> 
>>> This compares to the last time I ran these for the release 2.5 branch...
>>> 
>>> ================================================================================
>>> Date & Time     :  2 Feb 2009 23:57:03
>>> Test Name       : llvm_gfortran_lin_p4
>>> Compile Command : llvm-gfortran -ffast-math -funroll-loops -msse3 -O3 %n.f90 -o %n
>>> Benchmarks      : ac aermod air capacita channel doduc fatigue gas_dyn induct linpk mdbx nf protein rnflow test_fpu tfft
>>> Maximum Times   :     2000.0
>>> Target Error %  :      0.100
>>> Minimum Repeats :    10
>>> Maximum Repeats :   100
>>> 
>>>  Benchmark   Compile  Executable   Ave Run  Number   Estim
>>>       Name    (secs)     (bytes)    (secs) Repeats   Err %
>>>  ---------   -------  ----------   ------- -------  ------
>>>         ac      0.28       10000     15.01      10  0.0805
>>>     aermod     16.03       10000     15.83      10  0.0772
>>>        air      1.62       10000      8.21      10  0.0472
>>>   capacita      0.47       10000     51.23      10  0.0261
>>>    channel      0.23       10000      3.32      10  0.0106
>>>      doduc      1.64       10000     34.17      10  0.0060
>>>    fatigue      0.70       10000     12.74      10  0.0572
>>>    gas_dyn      0.55       10000     16.07      10  0.0771
>>>     induct      1.75       10000     26.54      10  0.0017
>>>      linpk      0.22       10000     15.42      10  0.0205
>>>       mdbx      0.63       10000     14.13      12  0.0162
>>>         nf      0.26       10000     29.01      10  0.0909
>>>    protein      0.70       10000     44.89      10  0.0133
>>>     rnflow      1.09       10000     39.58      10  0.0212
>>>   test_fpu      0.89       10000     14.02      10  0.0132
>>>       tfft      0.17       10000      2.20      12  0.0149
>>> 
>>> Geometric Mean Execution Time =      16.15 seconds
>>> 
>>> ================================================================================
>>> 
>>> In general, since the 2.5 release, the code performance is better
>>> but the compile time is somewhat regressed.
>>>                     Jack
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