[Bug math/17678] New: Testing failed about expm1

["wuxiang at iscas dot ac.cn" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17678

            Bug ID: 17678
           Summary: Testing failed about expm1
           Product: glibc
           Version: 2.19
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: wuxiang at iscas dot ac.cn

The following error was encountered when build the eglibc-2.19.

make[2]: Target `check' not remade because of errors.
make[2]: Leaving directory `/home/nano/zwx/eglibc-2.19'
make[1]: *** [check] Error 2
make[1]: Leaving directory `/home/nano/zwx/eglibc-2.19/build-tree/i386-libc'
#
# Testsuite failures, someone should be working towards
# fixing these! They are listed here for the purpose of
# regression testing during builds.
# Format: , Error  [(ignored)]
#
annexc.out, Error 1 (ignored)
run-conformtest.out, Error 1 (ignored)
test-double.out, Error 1
test-float.out, Error 1
test-idouble.out, Error 1
test-ifloat.out, Error 1
tst-cputimer1.out, Error 1
***************
Encountered regressions that don't match expected failures
(debian/testsuite-checking/expected-results-i686-linux-gnu-libc):
test-double.out, Error 1
test-float.out, Error 1
test-idouble.out, Error 1
test-ifloat.out, Error 1
TEST test-double.out:
testing double (without inline functions)
Failure: Test: expm1_towardzero (-0x1p-64)
Result:
 is:         -5.42101086242752217003e-20  -0x1.00000000000000000000p-64
 should be:  -5.42101086242752156818e-20  -0x1.fffffffffffff0000000p-65
 difference:  6.01853107621011204079e-36   0x1.00000000000000000000p-117
 ulp       :  1.0000
 max.ulp   :  0.0000
Failure: Test: expm1_downward (-0x1p-64)
Result:
 is:         -5.42101086242752337375e-20  -0x1.00000000000010000000p-64
 should be:  -5.42101086242752217004e-20  -0x1.00000000000000000000p-64
 difference:  1.20370621524202240815e-35   0x1.00000000000000000000p-116
 ulp       :  1.0000
 max.ulp   :  0.0000
Failure: Test: expm1_upward (-0x1p-64)
Result:
 is:         -5.42101086242752217003e-20  -0x1.00000000000000000000p-64
 should be:  -5.42101086242752156818e-20  -0x1.fffffffffffff0000000p-65
 difference:  6.01853107621011204080e-36   0x1.00000000000000000000p-117
 ulp       :  1.0000
 max.ulp   :  0.0000

Test suite completed:
  15788 test cases plus 15136 tests for exception flags and
    15136 tests for errno executed.
  3 errors occurred.
TEST test-float.out:
testing float (without inline functions)
Failure: Test: expm1_towardzero (-0x1p-64)
Result:
 is:         -5.42101086242752217003e-20  -0x1.00000000000000000000p-64
 should be:  -5.42101053931009539151e-20  -0x1.fffffe00000000000000p-65
 difference:  3.23117426778526435496e-27   0x1.00000000000000000000p-88
 ulp       :  1.0000
 max.ulp   :  0.0000
Failure: Test: expm1_downward (-0x1p-64)
Result:
 is:         -5.42101150866237572710e-20  -0x1.00000200000000000000p-64
 should be:  -5.42101086242752217004e-20  -0x1.00000000000000000000p-64
 difference:  6.46234853557052870993e-27   0x1.00000000000000000000p-87
 ulp       :  1.0000
 max.ulp   :  0.0000
Failure: Test: expm1_upward (-0x1p-64)
Result:
 is:         -5.42101086242752217003e-20  -0x1.00000000000000000000p-64
 should be:  -5.42101053931009539151e-20  -0x1.fffffe00000000000000p-65
 difference:  3.23117426778526435497e-27   0x1.00000000000000000000p-88
 ulp       :  1.0000
 max.ulp   :  0.0000

Test suite completed:
  10839 test cases plus 10240 tests for exception flags and
    10240 tests for errno executed.
  3 errors occurred.
TEST test-idouble.out:
testing double (inline functions)
Failure: Test: expm1_downward (-0x1p-64)
Result:
 is:         -5.42101086242752337375e-20  -0x1.00000000000010000000p-64
 should be:  -5.42101086242752217004e-20  -0x1.00000000000000000000p-64
 difference:  1.20370621524202240815e-35   0x1.00000000000000000000p-116
 ulp       :  1.0000
 max.ulp   :  0.0000

Test suite completed:
  15636 test cases plus 14984 tests for exception flags and
    14984 tests for errno executed.
  1 errors occurred.
TEST test-ifloat.out:
testing float (inline functions)
Failure: Test: expm1_downward (-0x1p-64)
Result:
 is:         -5.42101150866237572710e-20  -0x1.00000200000000000000p-64
 should be:  -5.42101086242752217004e-20  -0x1.00000000000000000000p-64
 difference:  6.46234853557052870993e-27   0x1.00000000000000000000p-87
 ulp       :  1.0000
 max.ulp   :  0.0000

Test suite completed:
  10733 test cases plus 10134 tests for exception flags and
    10134 tests for errno executed.
  1 errors occurred.
Encountered progressions that don't match expected failures:
tst-backtrace6.out, Error 1
tst-cpuclock2.out, Error 1
tst-mqueue5.out, Error 1
tst-timer.out, Error 139
tst-waitid.out, Error 1
make: *** [/home/nano/zwx/eglibc-2.19/stamp-dir/check_libc] Error 1
dpkg-buildpackage: error: debian/rules build gave error exit status 2

Is it the "difference" not small enough? 
My os is: 32 bit ubuntu 14.04
the processor is: VIA Nano X2 L4350
Compiler: gcc-4.8

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