[Bug 1926752] Comment bridged from LTC Bugzilla

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------- Comment From Boris.mail at de.ibm.com 2023-08-03 05:17 EDT-------
The new libgmp version 6.3.0 from upstream which was included in Ubuntu 23.10 (proposed) fails with illegal instructions due to the z13 part.

Therefore, z13 optimizations had to be temporarily removed until problem
is fixed.

The error has been reported by Canonical in the following separate LP
entry / bugzilla:

Bug 203320 - LP#2029438 : [Reverse Mirror] gmp z13 config fails with
illegal instructions

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https://bugs.launchpad.net/bugs/1926752

Title:
  [23.10 FEAT] libgmp SIMD optimizations

Status in Ubuntu on IBM z Systems:
  Fix Released
Status in gmp package in Ubuntu:
  Fix Released

Bug description:
  Optimize the GNU MP Bignum Library using vector instructions.

  - Requirement for Full Homomorphic Encryption, libgmp is used as a backend for NTL
  - libgmp performance is critical also for GNU Cobol on Z.
  Here a customer requested using packed decimal instructions in libgmp which does not appear to fit for libgmp - however SIMD would help on distros with ALS z13

  https://gmplib.org/#STATUS

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