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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

did you check the manual?  We've got a section on "Known Maximum
Errors in Math Functions".

 Andreas Jaeger
  SuSE Labs address@hidden
   private address@hidden

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