Re: [Blitz-support] Testsuite Failure, expression-slicing.exe

[Patrik J. <co...@fa...>]

I suspect this has to do with aggressive optimization and comparing
floating-point results. Could you try printing out the lhs and rhs and
manually assess what the discrepancy is?  just add "cout <<
array_1(sin(a)(1,Range::all()) <<
array_1(array_2(sin(a))(1,Range::all()))".

I worried about comparing the results by equality for exactly this
reason, but since there is no blitz reduction "nearenough", it's more
painful.

cheers,

/Patrik

On Tue, Feb 23, 2010 at 7:22 AM, hughgs <hu...@du...> wrote:
>
> With optimization turned on, I'm getting a couple of failures in make
> testsuite while running expression-slicing.exe.  I've isolated the
> first failure to this line:
>
> test_expr(sin(a)(1,Range::all()), array_2(sin(a))(1,Range::all()));
>
> If I compile, in the testsuite directory, with the optimization flags on,
> expression-slicing.exe fails at the above line.
>
> $ g++ -DHAVE_CONFIG_H   -I. -I.. -I..  -g -DBZ_DEBUG -O3 -funroll-loops -fstrict-aliasing -fomit-frame-pointer -ffast-math -o expression-slicing.exe expression-slicing.cpp -L../lib/.libs -lblitz
> $ ./expression-slicing.exe
> Test failed: expression-slicing.cpp line 35
>
> Interestinly, I can get past that line if I don't compile with O3
> optimization:
>
> $ g++ -DHAVE_CONFIG_H   -I. -I.. -I..  -g -DBZ_DEBUG -O0 -funroll-loops -fstrict-aliasing -fomit-frame-pointer -ffast-math -o expression-slicing.exe expression-slicing.cpp -L../lib/.libs -lblitz
> $ ./expression-slicing.exe
> $
>
>
> The second error has the exact same symptons except it's related to this
> line:
>
> test_expr(Laplacian2D(sin(a))(1,Range::all()),
>          array_2(Laplacian2D(sin(a)))(Range(1,1),Range::all()));
>
>
> One other thing I tried was to substitute cos() and exp() functions but
> the failure still occurs when compiling with the -O3 flag.  I'm compiling
> with gcc 4.3.4 under Cygwin for Windows.  Any ideas.  Thanks.
>
>
> George S. Hugh
>
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