QEMU x87 emulation of trig and other complex ops is only at 64-bit precision, not 80-bit

This bug has been copied automatically from: https://bugs.launchpad.net/qemu/+bug/645662

When doing the regression tests for Python 3.1.2 with Qemu 0.12.5, (Linux
version 2.6.26-2-686 (Debian 2.6.26-25lenny1)),
gcc (Debian 4.3.2-1.1) 4.3.2, Python compiled from sources within qemu,
3 math tests fail, apparently because the floating point unit is buggy.
Qmeu was compiled from original sources
on Debian Lenny with kernel  2.6.34.6 from kernel.org, gcc  (Debian
4.3.2-1.1) 4.3.

Regression testing errors:

test_cmath
test test_cmath failed -- Traceback (most recent call last):
  File "/root/tools/python3/Python-3.1.2/Lib/test/test_cmath.py", line
364, in
    self.fail(error_message)
AssertionError: acos0034: acos(complex(-1.0000000000000002, 0.0))
Expected: complex(3.141592653589793, -2.1073424255447014e-08)
Received: complex(3.141592653589793, -2.1073424338879928e-08)
Received value insufficiently close to expected value.


test_float
test test_float failed -- Traceback (most recent call last):
  File "/root/tools/python3/Python-3.1.2/Lib/test/test_float.py", line
479, in
    self.assertEqual(s, repr(float(s)))
AssertionError: '8.72293771110361e+25' != '8.722937711103609e+25'


test_math
test test_math failed -- multiple errors occurred; run in verbose mode for
deta

=>

runtests.sh -v test_math

le01:~/tools/python3/Python-3.1.2# ./runtests.sh -v test_math
test_math BAD
 1 BAD
 0 GOOD
 0 SKIPPED
 1 total
le01:~/tools/python3/Python-3.1.2#