Starting with glibc 2.10, test-float, test-double, test-ifloat, test-idouble 
fails on ia64. Some new tests have been added, and the generic maths code, the 
x86 and x86_64 maths codes have been adjusted, but not the ia64 one.

Here is for example the testsuite failure I get for test-ifloat:

testing float (without inline functions)
Failure: Test: errno for cos(+inf) == EDOM
Result:
 is:         0
 should be:  33
Failure: Test: errno for cos(-inf) == EDOM
Result:
 is:         0
 should be:  33
Failure: Test: errno for sin(+inf) == EDOM
Result:
 is:         0
 should be:  33
Failure: Test: errno for sin(-inf) == EDOM
Result:
 is:         0
 should be:  33
Failure: Test: errno for tan(Inf) == EDOM
Result:
 is:         0
 should be:  33
Failure: Test: errno for tan(-Inf) == EDOM
Result:
 is:         0
 should be:  33
Failure: Test: errno for pow(0,-odd) == ERANGE
Result:
 is:         33
 should be:  34
Failure: Test: errno for pow(0,-odd) == ERANGE
Result:
 is:         33
 should be:  34
Failure: Test: errno for pow(-0,-odd) == ERANGE
Result:
 is:         33
 should be:  34
Failure: Test: errno for pow(-0,-odd) == ERANGE
Result:
 is:         33
 should be:  34
Failure: Test: errno for pow(0,-even) == ERANGE
Result:
 is:         33
 should be:  34
Failure: Test: errno for pow(0,-num) == ERANGE
Result:
 is:         33
 should be:  34
Failure: Test: errno for pow(-0,-even) == ERANGE
Result:
 is:         33
 should be:  34
Failure: Test: errno for pow(-0,-num) == ERANGE
Result:
 is:         33
 should be:  34
Failure: Test: errno for lgamma(-integer) == ERANGE
Result:
 is:         33
 should be:  34
Failure: Test: errno for fmod(Inf,3) unchanged
Result:
 is:         0
 should be:  33
Failure: Test: errno for fmod(-Inf,3) unchanged
Result:
 is:         0
 should be:  33

Test suite completed:
  3008 test cases plus 2622 tests for exception flags executed.
  17 errors occurred.