[Bug math/17964] New: [powerpc] sqrt inaccurate

["jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17964

            Bug ID: 17964
           Summary: [powerpc] sqrt inaccurate
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jsm28 at gcc dot gnu.org
              Host: powerpc*-*-*

The version of sqrt (double) used for powerpc when _ARCH_PPCSQ is not defined
is inaccurate even for round-to-nearest, e.g.:

Failure: Test: sqrt (0x1.33b43b08p-1016)
Result:
 is:          1.30830442161170808105e-153   0x1.18a9f607e17020000000p-508
 should be:   1.30830442161170781607e-153   0x1.18a9f607e17010000000p-508
 difference:  2.64973491368899045401e-169   0x1.00000000000000000000p-560
 ulp       :  1.0000
 max.ulp   :  0.0000

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