[Bug libc/5490] New: cimagf gives incorrect results

[Bug libc/5490] New: cimagf gives incorrect results

[ismail at pardus dot org dot tr]

This is a stripped down testcase from gfortran testcases converted to C :

#include <complex.h>
#include <stdio.h>

int main() {
  float complex volatile z, one;
  z   = 5.0;
  one = 1.0;
  z   = cpowf (z, one);
  printf("%f\n", (double)cimagf(z));
  return 0;
}

prints -0.000141 with libc 2.7 where as it prins 0.000000 with libc 2.3.6 and
libc 2.4.11 on i686 host.

-- 
           Summary: cimagf gives incorrect results
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: ismail at pardus dot org dot tr
                CC: glibc-bugs at sources dot redhat dot com
  GCC host triplet: i686-gnu-linux


http://sourceware.org/bugzilla/show_bug.cgi?id=5490

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[Bug libc/5490] cimagf gives incorrect results

[ismail at pardus dot org dot tr]

------- Additional Comments From ismail at pardus dot org dot tr  2007-12-17 00:41 -------
Possibly a related problem:

#include <complex.h>
#include <stdio.h>

int main() {
  float complex volatile z;
  z   = 1.2 - 4.0*I;
  z   = clogf(z);
  printf("%lf\n", cimagf(z));
  return 0;
}

prints -0.000029 instead of -1.2793396 .

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=5490

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[Bug math/5490] cimagf gives incorrect results

[ismail at pardus dot org dot tr]

------- Additional Comments From ismail at pardus dot org dot tr  2007-12-17 19:21 -------
-> Assign to math component

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|drepper at redhat dot com   |aj at suse dot de
          Component|libc                        |math


http://sourceware.org/bugzilla/show_bug.cgi?id=5490

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[Bug math/5490] cimagf gives incorrect results

[ismail at pardus dot org dot tr]

------- Additional Comments From ismail at pardus dot org dot tr  2007-12-18 14:47 -------
math regression tests fail hence this is likely a gcc 4.3 problem instead.
Closing as Invalid.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


http://sourceware.org/bugzilla/show_bug.cgi?id=5490

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