[Bug 1708735] Re: lapack fails the testsuite on ppc64el when built with -O3

[Joel Stanley]

The failing tests:

 ******* FATAL ERROR - COMPUTED RESULT IS LESS THAN HALF ACCURATE *******
                       EXPECTED RESULT                    COMPUTED RESULT
       1  (   0.277223    ,  -0.348651    )  (   0.110137E+13,   0.164627E+13)
       2  (   0.806693    ,  -0.492507    )  (  -0.940210E+09,   0.547188E+12)
       3  (   0.966533    ,   0.442557    )  (  -0.275106E+12,  -0.136729E+10)
       4  (    0.00000    ,    0.00000    )  (  -0.452662E+20,  -0.498356E+20)
       5  (   0.926573    ,   0.106893    )  (   0.197802E+20,  -0.154845E+20)
       6  (   0.956543    ,  -0.100899    )  (   0.239256E+09,  -0.503443E+10)
       7  (   0.686813    ,  -0.156843    )  (   0.176324E+10,   0.214785E+09)
       8  (   0.247253    ,  -0.292707    )  (   0.247253    ,  -0.292707    )
       9  (   0.774226E-01,   0.989011E-01)  (   0.774226E-01,   0.989011E-01)
 ******* CTRSV  FAILED ON CALL NUMBER:
    195: CTRSV ('U','N','U',  9, A, 10, X, 2)                                   .

 CTBSV  PASSED THE TESTS OF ERROR-EXITS

 CTBSV  PASSED THE COMPUTATIONAL TESTS (   961 CALLS)

 CTPSV  PASSED THE TESTS OF ERROR-EXITS

 ******* FATAL ERROR - COMPUTED RESULT IS LESS THAN HALF ACCURATE *******
                       EXPECTED RESULT                    COMPUTED RESULT
       1  (   0.277223    ,  -0.348651    )  (   0.110137E+13,   0.164627E+13)
       2  (   0.806693    ,  -0.492507    )  (  -0.940210E+09,   0.547188E+12)
       3  (   0.966533    ,   0.442557    )  (  -0.275106E+12,  -0.136729E+10)
       4  (    0.00000    ,    0.00000    )  (  -0.452662E+20,  -0.498356E+20)
       5  (   0.926573    ,   0.106893    )  (   0.197802E+20,  -0.154845E+20)
       6  (   0.956543    ,  -0.100899    )  (   0.239256E+09,  -0.503443E+10)
       7  (   0.686813    ,  -0.156843    )  (   0.176324E+10,   0.214785E+09)
       8  (   0.247253    ,  -0.292707    )  (   0.247253    ,  -0.292707    )
       9  (   0.774226E-01,   0.989011E-01)  (   0.774226E-01,   0.989011E-01)
 ******* CTPSV  FAILED ON CALL NUMBER:
    195: CTPSV ('U','N','U',  9, AP, X, 2)                                      .

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https://bugs.launchpad.net/bugs/1708735

Title:
  lapack fails the testsuite on ppc64el when built with -O3

Status in lapack package in Ubuntu:
  Confirmed

Bug description:
  lapack fails the testsuite on ppc64el when built with -O3. works with
  -O2

  see
  https://launchpad.net/ubuntu/+source/lapack/3.7.1-1ubuntu2/+build/13199126

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