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Re: glibc 2.2: math test failures
From: |
Andreas Jaeger |
Subject: |
Re: glibc 2.2: math test failures |
Date: |
13 Dec 2000 08:47:18 +0100 |
User-agent: |
Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.1 (Capitol Reef) |
>>>>> Michael Deutschmann writes:
> On 10 Dec 2000, you wrote:
>> Michael Deutschmann <address@hidden> writes:
>>
>> > So I decided to try running make check with the oldest and slowest
>> > computer I own -- a 16MHz 80386 with a Weitek coprocessor. Needless
>> > to say, this took awhile...
>>
>> Well, I'll not address this. These kind of machines are simply
>> obsolete and adjusting the expected errors only means that we miss
>> other errors on better hardware.
> You mean you can adjust them? I'd have thought that those tests were to
> check if the library conforms to external standards as to the behavior of
> these functions. So "fixing" the test would mean retracting a claim as
> to the accuracy of the library, or rewriting the library function not to
> use problematic FPU instructions (with severe speed penalties).
The math functions are not specified up to the last bit. Therefore we
allow some errors - but we don't want to make that error range too
large.
did you check the manual? We've got a section on "Known Maximum
Errors in Math Functions".
Andreas
--
Andreas Jaeger
SuSE Labs address@hidden
private address@hidden
http://www.suse.de/~aj