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

[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]

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

[jeevitha at linux dot ibm.com]

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

Jeevitha P. <jeevitha at linux dot ibm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |adhemerval.zanella at linaro dot o
                   |                            |rg, jsm28 at gcc dot gnu.org

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

[jeevitha at linux dot ibm.com]

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

Jeevitha P. <jeevitha at linux dot ibm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
               Host|                            |powerpc

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

[jeevitha at linux dot ibm.com]

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

Jeevitha P. <jeevitha at linux dot ibm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |powerpc
               Host|powerpc                     |

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

[schwab@linux-m68k.org]

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

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
               Host|                            |powerpc*-*-*
             Target|powerpc                     |

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

[jsm28 at gcc dot gnu.org]

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

--- Comment #1 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
It's generally reasonable to update ulps like that (small differences can often
result from e.g. compiler choices about whether to use fused operations).

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

[bergner at linux dot ibm.com]

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

Peter Bergner <bergner at linux dot ibm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bergner at linux dot ibm.com

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

[jeevitha at linux dot ibm.com]

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

Jeevitha P. <jeevitha at linux dot ibm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Jeevitha P. <jeevitha at linux dot ibm.com> ---
This issue has been resolved by changing the ULP value for float128. Issue
resolved by the following commit.

commit 71dafdf5f19dd2b0729e4774149944911a405bc6
Author:     Florian Weimer <fweimer@redhat.com>
AuthorDate: Thu Jun 20 11:07:17 2024 +0200
Commit:     Florian Weimer <fweimer@redhat.com>
CommitDate: Thu Jun 20 12:15:31 2024 +0200

    powerpc: Update ulps

    Results based on POWER8 and POWER9 machines running
    powerpc64-linux-gnu, with and without --disable-multi-arch.

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