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[Qemu-devel] [Bug 645662] Re: QEMU x87 emulation of trig and other compl


From: Thomas Huth
Subject: [Qemu-devel] [Bug 645662] Re: QEMU x87 emulation of trig and other complex ops is only at 64-bit precision, not 80-bit
Date: Wed, 29 Nov 2017 12:31:41 -0000

Laurent Vivier recently started to adapt some of function from the
"Previous" NeXT emulator for m68k, see e.g. this patch series here:

 https://lists.gnu.org/archive/html/qemu-devel/2017-11/msg04454.html

Not sure, but I think that could help to fix at least some of the
missing functions.

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https://bugs.launchpad.net/bugs/645662

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

Status in QEMU:
  Confirmed

Bug description:
  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#

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