[Bug exp/18537] New: Failures with gnu_vector test case on x86

["arnez at linux dot vnet.ibm.com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18537

            Bug ID: 18537
           Summary: Failures with gnu_vector test case on x86
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: exp
          Assignee: unassigned at sourceware dot org
          Reporter: arnez at linux dot vnet.ibm.com
  Target Milestone: ---
            Target: i686-pc-linux-gnu

After enriching the gnu_vector test case with vector ABI tests, it yields
multiple failures on x86.

A patch for enriching the test was originally posted here:

  https://sourceware.org/ml/gdb-patches/2015-05/msg00319.html

That version contained XFAILs for x86.  When removing them, I see the following
FAILs:

  FAIL: gdb.base/gnu_vector.exp: call add_some_intvecs
  FAIL: gdb.base/gnu_vector.exp: call add_many_charvecs
  FAIL: gdb.base/gnu_vector.exp: call add_various_floatvecs
  FAIL: gdb.base/gnu_vector.exp: call add_structvecs
  FAIL: gdb.base/gnu_vector.exp: finish shows vector return value
  FAIL: gdb.base/gnu_vector.exp: verify vector return value (the program
exited)

For instance, the first FAIL above looks like this:

  print add_some_intvecs(i4a, i4b, 3 * i4a)
  $57 = {134513228, 0, 164241708, 1}

The correct result would be {17, 34, 72, 132}.

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