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[Bug math/21112] New: powf has large ulp errors with base close to 1 and exponent around 4000


https://sourceware.org/bugzilla/show_bug.cgi?id=21112

            Bug ID: 21112
           Summary: powf has large ulp errors with base close to 1 and
                    exponent around 4000
           Product: glibc
           Version: 2.24
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: nszabolcs at gmail dot com
  Target Milestone: ---

powf(0x1.059c76p+0,0x1.ff80bep+11) returns 0x1.fffbf8p+127 instead of
0x1.fffcaap+127 that is 89 ulp error.

powf(0.97 .. 1.03, 2000 .. 5000) often has >32 ulp errors (last 5 bits are
wrong)

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