[issue16534] test_float failure on IA64 (HPUX)

[Trent Nelson]

Trent Nelson added the comment:

On Fri, Nov 23, 2012 at 05:43:15AM -0800, Mark Dickinson wrote:
> 
> Mark Dickinson added the comment:
> 
> I wonder whether adding "-fpeval=float" to the CFLAGS would fix this.  
> There's a lot of information at 
> 
> http://h21007.www2.hp.com/portal/site/dspp/menuitem.863c3e4cbcdc3f3515b49c108973a801?ciid=0008a22194f02110a22194f02110275d6e10RCRD
> 
> but I don't know whether it's relevant to this machine.  Trent?

No idea.  I'll look into it.

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[issue16534] test_float failure on IA64 (HPUX)

[Stefan Krah]

Stefan Krah added the comment:

For some reason ./configure detects x87-style-double-rounding=yes, but when
I compile the test manually with the same command line "cc -Ae -g", no
double rounding is detected.

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[issue16534] test_float failure on IA64 (HPUX)

[Mark Dickinson]

Mark Dickinson added the comment:

I wonder whether adding "-fpeval=float" to the CFLAGS would fix this.  There's 
a lot of information at 

http://h21007.www2.hp.com/portal/site/dspp/menuitem.863c3e4cbcdc3f3515b49c108973a801?ciid=0008a22194f02110a22194f02110275d6e10RCRD

but I don't know whether it's relevant to this machine.  Trent?

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[issue16534] test_float failure on IA64 (HPUX)

[Mark Dickinson]

Mark Dickinson added the comment:

Without having looked too hard, the many warnings are almost certainly from our 
definition of Py_NAN.  That's been fixed in the default branch.  I'm not sure 
whether it's worth backporting just to fix warnings.

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[issue16534] test_float failure on IA64 (HPUX)

[Mark Dickinson]

Mark Dickinson added the comment:

>From the buildbot configure output:

checking whether C doubles are little-endian IEEE 754 binary64... no
checking whether C doubles are big-endian IEEE 754 binary64... yes
checking whether C doubles are ARM mixed-endian IEEE 754 binary64... no
checking whether we can use gcc inline assembler to get and set x87 control 
word... no
checking for x87-style double rounding... yes

Judging by that, it'll probably be using the legacy float repr, since the 
configure script didn't find a way to set the FPU control word.

In that case this is just an overeager test: we expect 50 digits of accuracy 
but the system-supplied formatting only gives us 35.

But it would also be good to try to find a way to enable the short float repr 
on that box.

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[issue16534] test_float failure on IA64 (HPUX)

[Mark Dickinson]

Mark Dickinson added the comment:

What's sys.float_repr_style on that machine?

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[issue16534] test_float failure on IA64 (HPUX)

[Stefan Krah]

New submission from Stefan Krah:

There's a test_float failure on HPUX (and many compiler warnings):

test test_float failed -- Traceback (most recent call last):
  File 
"/home/cpython/buildslave/2.7.snakebite-hpux11iv3-ia64-1/build/Lib/test/test_float.py",
 line 622, in test_format_testfile
self.assertEqual(fmt % arg, rhs)
AssertionError: '464902769475481793200' != 
'464902769475481793196872414789632'

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components: Tests
messages: 176133
nosy: mark.dickinson, skrah
priority: normal
severity: normal
status: open
title: test_float failure on IA64 (HPUX)
type: behavior
versions: Python 2.7

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