Results of cos(pi/2) tests are dependent on error rounding pi/2 to a type.

[Andreas Schwab]

I'm getting this result on ppc for long double:

Failure: Test: cos (pi/2) == 1.082856673921913968223746169860580e-32
Result:
 is:          1.08285667392191396822e-32   0x1.c1cd129024e088a67cc7p-107
 should be:   1.08285667392191396822e-32   0x1.c1cd129024e088a67cc7p-107
 difference:  5.71253355584909492648e-62   0x1.78000000000000000000p-204
 ulp       :  376.0000
 max.ulp   :  0.0000
Maximal error of `cos'
 is      : 376 ulp
 accepted: 1 ulp
Failure: Test: sincos (pi/2, &sin_res, &cos_res) puts 1.082856673921913968223746169860580e-32 in cos_res
Result:
 is:          1.08285667392191396822e-32   0x1.c1cd129024e088a67cc7p-107
 should be:   1.08285667392191396822e-32   0x1.c1cd129024e088a67cc7p-107
 difference:  5.71253355584909492648e-62   0x1.78000000000000000000p-204
 ulp       :  376.0000
 max.ulp   :  0.0000
Maximal error of `sincos'
 is      : 376 ulp
 accepted: 1 ulp

Filed as PR15359.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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