[Bug dynamic-link/32470] New: Integer truncation during x86-64 cache size computation

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=32470

            Bug ID: 32470
           Summary: Integer truncation during x86-64 cache size
                    computation
           Product: glibc
           Version: 2.41
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
            Target: x86_64-*-*

It seems that FreeBSD's bhyve hypervisor sets the L3 cache size to 1 TiB in
some cases (notably on AMD systems). This causes rep_movsb_threshold to turn to
zero, leading to crashes in memcpy/memmove.

  /* NB: The REP MOVSB threshold must be greater than VEC_SIZE * 8.  */
  unsigned int minimum_rep_movsb_threshold;
  /* NB: The default REP MOVSB threshold is 4096 * (VEC_SIZE / 16) for
     VEC_SIZE == 64 or 32.  For VEC_SIZE == 16, the default REP MOVSB
     threshold is 2048 * (VEC_SIZE / 16).  */
  unsigned int rep_movsb_threshold;

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