Re: [eigen] can't reproduce gcc 4.3.4 errors

[Benoit Jacob <jacob.benoit.1@xxxxxxxxx>]

hehe, this sounds like the problem that Sune had the other day on IRC. CC'ing.

Benoit

2010/6/29 Gael Guennebaud <gael.guennebaud@xxxxxxxxx>:
> hm,
>
> -O2 -fno-strict-aliasing (and removing the hardcoded -fstrict-aliasing
> from our cmakefile)
>
> 100% tests passed, 0 tests failed out of 453
>
> much better.
>
> gael
>
> On Tue, Jun 29, 2010 at 10:55 AM, Gael Guennebaud
> <gael.guennebaud@xxxxxxxxx> wrote:
>> ok here,  with -O2 -fno-guess-branch-probability, 4 tests fail as follow:
>>
>> guenneba@devel10:~/eigen/build/test> ./array_2
>> Initializing random number generator with seed 1277801661
>> Repeating each test 10 times
>> Test comparisons(Array22f()) failed in
>> "/home/guenneba/eigen/test/array.cpp" (136)
>>    test_ei_isApprox(((m1.abs()+1)>RealScalar(0.1)).colwise().count(),
>> ArrayOfIndices::Constant(cols,rows).transpose())
>>
>> guenneba@devel10:~/eigen/build/test> ./array_3
>> Initializing random number generator with seed 1277801662
>> Repeating each test 10 times
>>
>>    actual   = 2.66729
>>    expected = 2.53391
>>
>>
>>    actual   = 1.17816
>>    expected = 1.93492
>>
>>
>>    actual   = -2.79358
>>    expected = -0.758141
>>
>>
>>    actual   = -2.06046
>>    expected = -2.54951
>>
>>
>>    actual   = -1.27569
>>    expected = 0.919771
>>
>>
>>    actual   = 5.67633
>>    expected = 4.85775
>>
>>
>>    actual   = -5.2517
>>    expected = -3.85892
>>
>>
>>    actual   = -1.33353
>>    expected = -0.700732
>>
>>
>>    actual   = -3.33972
>>    expected = 0.721723
>>
>>
>>    actual   = -1.61675
>>    expected = 0.256261
>>
>> Segmentation fault
>>
>> guenneba@devel10:~/eigen/build/test> ./geo_hyperplane_4
>> Initializing random number generator with seed 1277801668
>> Repeating each test 10 times
>> Segmentation fault
>>
>> guenneba@devel10:~/eigen/build/test> ./geo_parametrizedline_4
>> Initializing random number generator with seed 1277801673
>> Repeating each test 10 times
>> Segmentation fault
>>
>>
>> gael
>>
>> On Tue, Jun 29, 2010 at 10:29 AM, Hauke Heibel
>> <hauke.heibel@xxxxxxxxxxxxxx> wrote:
>>> Ok, I can try to run the complete tests too. Here are also the flags I
>>> used to run (so far just a few of) the failing tests.
>>>
>>> CXX:               /usr/bin/c++-4.exe
>>> CXX_VERSION:       c++-4 (GCC) 4.3.4 20090804 (release) 1
>>> CXX_FLAGS:          -Wnon-virtual-dtor -Wno-long-long -ansi -Wundef
>>> -Wcast-align -Wchar-subscripts -Wall -W -Wpointer-arith
>>> -Wwrite-strings -Wformat-s
>>> ecurity -fexceptions -fno-check-new -fno-common -fstrict-aliasing
>>> -Wno-variadic-macros -Wextra -pedantic
>>>
>>> - Hauke
>>>
>>> On Tue, Jun 29, 2010 at 10:25 AM, Gael Guennebaud
>>> <gael.guennebaud@xxxxxxxxx> wrote:
>>>> On Tue, Jun 29, 2010 at 10:14 AM, Hauke Heibel
>>>> <hauke.heibel@xxxxxxxxxxxxxx> wrote:
>>>>> On Mon, Jun 28, 2010 at 11:15 PM, Gael Guennebaud
>>>>> <gael.guennebaud@xxxxxxxxx> wrote:
>>>>>> I believe there is a bug in gcc, here is the related bug report:
>>>>>> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42255
>>>>>> but no fix yet.
>>>>>
>>>>> That means we can get rid of the errors by disabling -fprofile-arcs?
>>>>
>>>> A while ago, such errors appeared only with  -fprofile-arcs, i.e.,
>>>> when coverage testing was enabled. But now, even without
>>>> -fprofile-arcs we hit these weird errors. After some investigations, I
>>>> found that disabling the guess-branch-probability optimization that is
>>>> automatically enabled with -O2 solved a couple of errors:
>>>>
>>>> -O2 -fno-guess-branch-probability
>>>>
>>>> Actually, guess-branch-probability and -fprofile-arcs seems to be
>>>> quite related. I've updated the bug report with that respect, but news
>>>> so far.
>>>>
>>>> I'm currently compiling with -O2 -fno-guess-branch-probability to see
>>>> if there remain other errors....
>>>>
>>>>
>>>> gael
>>>>
>>>>> - Hauke
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>
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