[Bug math/2500] New: Incorrrect cosf output

[Bug math/2500] New: Incorrrect cosf output

[hjl at lucon dot org]

[hjl@gnu-13 tmp]$ cat y.c
#include <stdio.h>
#include <math.h>

int
main ()
{
  printf ("%.20e\n", cos  (7.8544528e+04));
  printf ("%.20e\n", cosf (7.8544528e+04));
}
[hjl@gnu-13 tmp]$ gcc -O2 y.c -lm
[hjl@gnu-13 tmp]$ ./a.out
-7.28725145449983058125e-04
2.52127205021679401398e-03
[hjl@gnu-13 tmp]$

-- 
           Summary: Incorrrect cosf output
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: aj at suse dot de
        ReportedBy: hjl at lucon dot org
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=2500

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[Bug math/2500] Incorrect return from float cos (0X1.32D0875AC4074P+16)

[hjl at lucon dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Incorrrect retuen from float|Incorrect return from float
                   |cos (0X1.32D0875AC4074P+16) |cos (0X1.32D0875AC4074P+16)


http://sourceware.org/bugzilla/show_bug.cgi?id=2500

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[Bug math/2500] Incorrrect retuen from float cos (0X1.32D0875AC4074P+16)

[hjl at lucon dot org]

------- Additional Comments From hjl at lucon dot org  2006-04-14 18:33 -------
Failure: Test: cos (0X1.32D0875AC4074P+16) == -0X1.CA51FDD2C46CCP-40
Result:
 is:          2.52127205021679401398e-03   0x1.4a77da00000000000000p-9
 should be:  -1.62828073507065296255e-12  -0x1.ca51fe00000000000000p-40
 difference:  2.52127205021679401398e-03   0x1.4a77da00000000000000p-9
 ulp       :  23254630125273088.0000
 max.ulp   :  0.0000

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
  GCC build triplet|                            |x86_64-unknown-linux-gnu
   GCC host triplet|                            |x86_64-unknown-linux-gnu
 GCC target triplet|                            |x86_64-unknown-linux-gnu
            Summary|Incorrrect cosf output      |Incorrrect retuen from float
                   |                            |cos (0X1.32D0875AC4074P+16)


http://sourceware.org/bugzilla/show_bug.cgi?id=2500

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[Bug math/2500] Incorrect return from float cos (0X1.32D0875AC4074P+16)

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2006-04-23 17:48 -------
Suspended until somebody comes up with the patch.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |drepper at redhat dot com
             Status|NEW                         |SUSPENDED


http://sourceware.org/bugzilla/show_bug.cgi?id=2500

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[Bug math/2500] Incorrect return from float cos (0X1.32D0875AC4074P+16)

[jsm28 at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=2500

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

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

--- Comment #3 from Joseph Myers <jsm28 at gcc dot gnu.org> 2012-02-23 01:51:52 UTC ---
When the given 0X1.32D0875AC4074P+16 is rounded to float you get 0X1.32D088P+16
and cos of that value, correctly rounded to float, is exactly the value cosf
gives.

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