[Bug math/16815] New: PowerPC: nearbyint/nearbyintf bogus result for FE_DOWNWARD

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

https://sourceware.org/bugzilla/show_bug.cgi?id=16815

            Bug ID: 16815
           Summary: PowerPC: nearbyint/nearbyintf bogus result for
                    FE_DOWNWARD
           Product: glibc
           Version: 2.20
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: azanella at linux dot vnet.ibm.com

Optimized PowerPC 32-bits nearbyint/nearbyintf show bogus results for
FE_DOWNWARD rounding mode, as shown by math failing tests:

testing double (without inline functions)
Failure: Test: nearbyint_downward (-0.5)
Result:
 is:          0.00000000000000000000e+00   0x0.00000000000000000000p+0
 should be:  -1.00000000000000000000e+00  -0x1.00000000000000000000p+0
 difference:  1.00000000000000000000e+00   0x1.00000000000000000000p+0
 ulp       :  4503599627370496.0000
 max.ulp   :  0.0000
Failure: Test: nearbyint_downward (-1.5)
Result:
 is:         -1.00000000000000000000e+00  -0x1.00000000000000000000p+0
 should be:  -2.00000000000000000000e+00  -0x1.00000000000000000000p+1
 difference:  1.00000000000000000000e+00   0x1.00000000000000000000p+0
 ulp       :  2251799813685248.0000
 max.ulp   :  0.0000
Failure: Test: nearbyint_downward (-2.5)
Result:
 is:         -2.00000000000000000000e+00  -0x1.00000000000000000000p+1
 should be:  -3.00000000000000000000e+00  -0x1.80000000000000000000p+1
 difference:  1.00000000000000000000e+00   0x1.00000000000000000000p+0
 ulp       :  2251799813685248.0000
 max.ulp   :  0.0000
Failure: Test: nearbyint_downward (-3.5)
Result:
 is:         -3.00000000000000000000e+00  -0x1.80000000000000000000p+1
 should be:  -4.00000000000000000000e+00  -0x1.00000000000000000000p+2
 difference:  1.00000000000000000000e+00   0x1.00000000000000000000p+0
 ulp       :  1125899906842624.0000
 max.ulp   :  0.0000
Failure: Test: nearbyint_downward (-4.5)
Result:
 is:         -4.00000000000000000000e+00  -0x1.00000000000000000000p+2
 should be:  -5.00000000000000000000e+00  -0x1.40000000000000000000p+2
 difference:  1.00000000000000000000e+00   0x1.00000000000000000000p+0
 ulp       :  1125899906842624.0000
 max.ulp   :  0.0000

These are not all the failing tests, just an except.

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