[Bug math/31818] New: math/test-float128-log2p1, math/test-float64x-log2p1, math/test-ldouble-log2p1 fails on ppc64le-power8-nomultiarch

["jeevitha at linux dot ibm.com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31818

            Bug ID: 31818
           Summary: math/test-float128-log2p1, math/test-float64x-log2p1,
                    math/test-ldouble-log2p1 fails on
                    ppc64le-power8-nomultiarch
           Product: glibc
           Version: 2.39
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: jeevitha at linux dot ibm.com
  Target Milestone: ---

Log2p1 was implemented in commit
id(79c52daf4740b00bef43e4f5a4281b3480459b38)and maximum allowed error was
updated for powerpc in the commit (f83e461f1014598a5cb4c89407ce303b9f0bd8ac).
We are seeing the tests was failing with "--disable-multi-arch" in power8 LE.
The issue with those test cases is that the expected ULP from
"sysdeps/powerpc/fpu/libm-test-ulps" does not match the result. The expected
ULP for float128 is 2, but we are getting 3 for Power8.
However, there are no issues on Power9 and Power10 since their output has error
of 2 ulp. Can we change the ulps for float128 to 3? Is this a reasonable
change.

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