Compiler settings for the examples

[Matthias Kretz]

There's nothing in the output because nothing was compiled. Do a 'make clean' first.

[please enable javascript to see the address]> wrote:
>Hi Matthias,
>  Thanks a lot. I did try doing the "make VERBOSE =1" and could not get
>any info on the compiler settings. Could you help me out here. This is
>kind
>of important for a paper I am submitting very shortly. The output
>doesnt
>seem to have information on the compiler settings.
>
>cd /home/krishna/vc/build6 && /usr/bin/cmake -H/home/krishna/vc
>-B/home/krishna/vc/build6 --check-build-system
>CMakeFiles/Makefile.cmake 0
>cd /home/krishna/vc/build6 && /usr/bin/cmake -E cmake_progress_start
>/home/krishna/vc/build6/CMakeFiles
>/home/krishna/vc/build6/examples/CMakeFiles/progress.marks
>cd /home/krishna/vc/build6 && make -f CMakeFiles/Makefile2 examples/all
>make[1]: Entering directory `/home/krishna/vc/build6'
>make -f CMakeFiles/Vc.dir/build.make CMakeFiles/Vc.dir/depend
>make[2]: Entering directory `/home/krishna/vc/build6'
>cd /home/krishna/vc/build6 && /usr/bin/cmake -E cmake_depends "Unix
>Makefiles" /home/krishna/vc /home/krishna/vc /home/krishna/vc/build6
>/home/krishna/vc/build6
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>cd /home/krishna/vc/build6 && /usr/bin/cmake -E cmake_depends "Unix
>Makefiles" /home/krishna/vc /home/krishna/vc/examples/polarcoord
>/home/krishna/vc/build6 /home/krishna/vc/build6/examples/polarcoord
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>polarcoord/CMakeFiles/example_polarcoord_avx.dir/DependInfo.cmake
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>Makefiles" /home/krishna/vc /home/krishna/vc/examples/polarcoord
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>Makefiles" /home/krishna/vc /home/krishna/vc/examples/matrix
>/home/krishna/vc/build6 /home/krishna/vc/build6/examples/matrix
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>
>[please enable javascript to see the address]>
>wrote:
>
>> Hi Krishna,
>>
>> when you compile a project using cmake, use 'make VERBOSE=1' to see
>the
>> compiler flags it uses.
>>
>> In very few cases, in Vc, I use compiler flags to inhibit automatic
>> vectorization (if I want to compare scalar vs. vector *hardware*). I
>don't
>> recall right now what I do for the polar coordinates case, but I
>think I
>> leave
>> the compiler on -O3 (i.e. autovectorize and optimize as much as
>possible).
>>
>> In general, I think your argument should not be: my code
>transformation can
>> vectorize something that a compiler does not vectorize. That's a race
>> against
>> many very smart people. I think what you want to show is that you can
>> transform a given scalar code base into a Vc code base as a useful
>basis
>> for
>> further manual vectorization development. That's something compilers
>don't
>> do
>> at all...
>>
>> Cheers,
>>   Matthias
>>
>> On Samstag, 27. August 2016 10:52:55 CEST Krishna Narasimhan wrote:
>> > Hi all,
>> >     I am wondering about the compiler settings for the example
>files
>> > posted. I ran a small test on the cartesian-polar coordinate
>example in
>> the
>> > VC website and just used the makefile available there to assess the
>run
>> > times. And the run times for the VC was substantially better than
>the run
>> > times for the Scalar versions. But the question is couldnt compiler
>level
>> > optimizations have done this already. And was wondering what level
>the
>> > compilers are set for the basic makefiles in the VC by default.
>> >
>> > Basically, I am using the polar cartesian co ordinate example as
>part of
>> my
>> > research with programming languages (and simple vc transformations
>are
>> one
>> > of the evaluation) and would be nice to justify even these simple
>> > transformations are not stuff that compilers dont vectorize
>> automatically.
>> >
>> >
>> >
>> > Best
>> > Krishna
>>
>>
>> --
>>
>──────────────────────────────────────────────────────────────────────────
>>  Dr. Matthias Kretz                               
>https://kretzfamily.de
>>  GSI Helmholtzzentrum für Schwerionenforschung            
>https://gsi.de
>>  SIMD easy and portable                    
>https://github.com/VcDevel/Vc
>>
>──────────────────────────────────────────────────────────────────────────
>> _______________________________________________
>> Vc mailing list
>>[please enable javascript to see the address]
>> https://compeng.uni-frankfurt.de/mailman/listinfo/vc

-- 
Dr. Matthias Kretz
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