#11920: Sympow needs to disable fused-multiply-add and should create datafiles
------------------------------+---------------------------------------------
Reporter: jdemeyer | Owner: tbd
Type: defect | Status: needs_work
Priority: major | Milestone: sage-5.0
Component: packages | Keywords:
Work_issues: | Upstream: None of the above - read trac
for reasoning.
Reviewer: Leif Leonhardy | Author: Jeroen Demeyer
Merged: | Dependencies:
------------------------------+---------------------------------------------
Changes (by leif):
* status: needs_review => needs_work
Comment:
Replying to [comment:32 leif]:
> More detailed:
{{{
...
gcc -v
Using built-in specs.
Target: ia64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-
checking=release --with-system-zlib --enable-__cxa_atexit --disable-
libunwind-exceptions --enable-libgcj-multifile --enable-
languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk
--disable-dssi --enable-plugin --with-java-
home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --host=ia64-redhat-linux
Thread model: posix
gcc version 4.1.2 20080704 (Red Hat 4.1.2-44)
****************************************************
patching file Configure
patching file generate.c
patching file fpu.c
Initial CFLAGS='-O3 -g -fno-strict-aliasing'
Testing '-ffp-contract=on': ...not recognized (compilation failed)
Testing '-mno-fused-madd': ...not recognized (compilation failed)
Testing '-mfpmath=sse': ...not recognized (compilation failed)
Testing '-mpc64': ...not recognized (compilation failed)
Accumulated CFLAGS='-O3 -g -fno-strict-aliasing'
The double precision of your FPU is 105 bits.
The Quad Double library used by SYMPOW assumes IEEE-754 double precision
numbers with exactly 53 bits in the mantissa (64 bits in total).
Unfortunately, we currently have no workaround for your system.
Running SYMPOW will almost certainly fail on some inputs.
...
}}}
In this case `-ffloat-store` helps (`-fno-fast-math` doesn't):
{{{
...
patching file Configure
patching file generate.c
patching file fpu.c
Initial CFLAGS='-O3 -g -fno-strict-aliasing'
Testing '-ffp-contract=on': ...not recognized (compilation failed)
Testing '-mno-fused-madd': ...not recognized (compilation failed)
Testing '-mfpmath=sse': ...not recognized (compilation failed)
Testing '-mpc64': ...not recognized (compilation failed)
Testing '-ffloat-store': ...compiles ...runs (exit code 0)
Testing '-fno-fast-math': ...compiles ...runs (exit code 0)
Accumulated CFLAGS='-O3 -g -fno-strict-aliasing -ffloat-store -fno-fast-
math'
The double precision of your FPU is 53 bits.
...
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11920#comment:33>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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