"make check" failures on ia64

[H. J. Lu]

I got

# cat /export/build/gnu/glibc/build-ia64-linux/csu/tst-atomic.out
atomic_compare_and_exchange_val_acq test 3 failed
atomic_compare_and_exchange_bool_acq test 3 failed
# cat /export/build/gnu/glibc/build-ia64-linux/math/test-ldouble.out
testing long double (without inline functions)
Failure: Test: Imaginary part of: ctan (-2 - 3 i) ==
0.376402564150424829275122113032269084e-2 -
1.00323862735360980144635859782192726 i
Result:
 is:         -1.00323862735360980138e+00  -0x8.06a1f9348a9e7fa00000p-3
 should be:  -1.00323862735360980149e+00  -0x8.06a1f9348a9e7fb00000p-3
 difference:  1.08420217248550443401e-19   0x8.00000000000000000000p-66
 ulp       :  1.0000
 max.ulp   :  0.0000
Maximal error of real part of: ctan
 is      : 2 ulp
 accepted: 436 ulp
Maximal error of imaginary part of: ctan
 is      : 1 ulp
 accepted: 0 ulp

Test suite completed:
  2501 test cases plus 2290 tests for exception flags executed.
  2 errors occurred.
# cat /export/build/gnu/glibc/build-ia64-linux/math/test-ildoubl.out
testing long double (inline functions)
Failure: Test: Imaginary part of: ctan (-2 - 3 i) ==
0.376402564150424829275122113032269084e-2 -
1.00323862735360980144635859782192726 i
Result:
 is:         -1.00323862735360980138e+00  -0x8.06a1f9348a9e7fa00000p-3
 should be:  -1.00323862735360980149e+00  -0x8.06a1f9348a9e7fb00000p-3
 difference:  1.08420217248550443401e-19   0x8.00000000000000000000p-66
 ulp       :  1.0000
 max.ulp   :  0.0000
Maximal error of real part of: ctan
 is      : 2 ulp
 accepted: 436 ulp
Maximal error of imaginary part of: ctan
 is      : 1 ulp
 accepted: 0 ulp

Test suite completed:
  2439 test cases plus 2228 tests for exception flags executed.
  2 errors occurred.


H.J.