Carlos O'Donell aba5e333d4 libm-test.inc: Fix tests where cos(PI/2) != 0. ... The value of PI is never exactly PI in any floating point representation, and the value of PI/2 is never PI/2. It is wrong to expect cos(M_PI_2l) to return 0, instead it will return an answer that is non-zero because M_PI_2l doesn't round to exactly PI/2 in the type used. That is to say that the correct answer is to do the following: * Take PI or PI/2. * Round to the floating point representation. * Take the rounded value and compute an infinite precision cos or sin. * Use the rounded result of the infinite precision cos or sin as the answer to the test. I used printf to do the type rounding, and Wolfram's Alpha to do the infinite precision cos calculations. The following changes bring x86-64 and x86 to 1/2 ulp for two tests. It shows that the x86 cos implementation is quite good, and that our test are flawed. Unfortunately given that the rounding errors are type dependent we need to fix this for each type. No regressions on x86-64 or x86. --- 2013-04-11 Carlos O'Donell <carlos@redhat.com> * math/libm-test.inc (cos_test): Fix PI/2 test. (sincos_test): Likewise. * sysdeps/x86_64/fpu/libm-test-ulps: Regenerate. * sysdeps/i386/fpu/libm-test-ulps: Regenerate.		2013-04-11 08:52:18 -04:00
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generic
gnu
i386	libm-test.inc: Fix tests where cos(PI/2) != 0.	2013-04-11 08:52:18 -04:00
ieee754	[BZ #14686, #15336] Fix standard compliance. Don't use hard-coded qNaN values.	2013-04-05 22:34:52 +02:00
init_array
mach	BZ#14280: Fix Hurd ioctl macro to avoid warning.	2013-04-08 14:31:38 -07:00
posix	Fix stack overflow in getaddrinfo with many results	2013-04-03 17:39:15 +02:00
powerpc	Refer to two GCC PRs.	2013-04-03 14:13:44 +02:00
pthread
s390	s390/s390x: Undef PSEUDO before redef.	2013-04-06 10:53:54 -04:00
sh
sparc
unix	Preserve errno across _PC_CHOWN_RESTRICTED call on XFS	2013-04-03 10:56:45 +05:30
wordsize-32
wordsize-64
x86
x86_64	libm-test.inc: Fix tests where cos(PI/2) != 0.	2013-04-11 08:52:18 -04:00