Re: glibc 2.7 complex functions are possibly miscompiled by gcc 4.3 trunk

[Ismail DÃnmez <ismail at pardus dot org dot tr>]

Saturday 22 December 2007 19:11:32 tarihinde Ismail DÃnmez ÅunlarÄ yazmÄÅtÄ:
> Hi all,
>
> I am doing glibc 4.3 regression tests using gcc 4.3 trunk nearly every day
> and I see 3 tests fail :
>
> math/test-float
> math/test-ildoubl
> math/test-ifloat
>
> The erorrs are all similar :
>
> Failure: Test: Imaginary part of: cacosh (-0 + 0 i) == 0.0 + pi/2 i
> Result:
>  is:          0.00000000000000000000e+00   0x0.00000000000000000000p+0
>  should be:   1.57079637050628662109e+00   0x1.921fb600000000000000p+0
>  difference:  1.57079637050628662109e+00   0x1.921fb600000000000000p+0
>  ulp       :  13176795.0000
>  max.ulp   :  0.0000

All these failures are gone when glibc is compiled with -O2 instead of -O3 but 
there are still 4 regressions :

math/test-ildoubl

Usual math problem :

testing long double (inline functions)
Failure: Test: expm1 (1) == M_El - 1.0
Result:
 is:          1.71828182845904523532e+00   0xd.bf0a8b14576953500000p-3
 should be:   1.71828182845904523543e+00   0xd.bf0a8b14576953600000p-3
 difference:  1.08420217248550443401e-19   0x8.00000000000000000000p-66
 ulp       :  1.0000
 max.ulp   :  0.0000
Maximal error of `expm1'
 is      : 1 ulp
 accepted: 0 ulp

libio/tst-fopenloc2
libio/tst-fopenloc

These two seems to be a new gcc regression, they crash when compiled with gcc 
trunk.

elf/check-localplt

These seems to be less harmful, shows memalign is missing from expected 
output.


Any ideas appreciated.

Regards,
ismail

-- 
Never learn by your mistakes, if you do you may never dare to try again.