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[Qemu-devel] FPU Accuracy on i386
From: |
Joel Sherrill |
Subject: |
[Qemu-devel] FPU Accuracy on i386 |
Date: |
Fri, 4 Apr 2008 11:51:29 -0500 |
User-agent: |
Thunderbird 2.0.0.12 (X11/20080226) |
Hi,
I hope this is the right mailing list.
I am using the precompiled 0.91 image to do
automated testing of i386-rtems. In the Ada
validation suite, 17 of the 21 failures appear
to be due to FP calculation accuracy. Here
is a typical test output for these:
,.,. CXG2002 ACATS 2.5 88-01-01 00:00:00
---- CXG2002 Check the accuracy of the complex modulus function.
* CXG2002 test 1 -- abs(bigreal + 0i) actual:
+Inf******************* expected:
1.18973149535723177E+4932 difference:
-Inf******************* max_err:
3.86972841582221554E+4913.
* CXG2002 test 2 -- abs(0 + bigreal*i) actual:
+Inf******************* expected:
1.18973149535723177E+4932 difference:
-Inf******************* max_err:
3.86972841582221554E+4913.
* CXG2002 test 8 -- abs(1 + 1*i) actual: 1.41421356237309515E+00
expected: 1.41421356237309505E+00 difference:
-9.67108337857069955E-17 max_err:
4.59988025005012224E-19.
**** CXG2002 FAILED ****************************.
I am running with the "-cpu 486" option on a 32-bit
x86 host.
Are there known issues with FPU code in qemu that
I should be aware of?
Thanks.
--
Joel Sherrill, Ph.D. Director of Research & Development
address@hidden On-Line Applications Research
Ask me about RTEMS: a free RTOS Huntsville AL 35805
Support Available (256) 722-9985
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