Fix fdim handling of infinities (bug 15797)

[Andreas Jaeger]

On 08/21/2013 06:43 PM, Joseph S. Myers wrote:
> This patch fixes bug 15797, incorrect fdim handling of infinities, by
> removing the bogus check for infinities when returning x - y for NaN
> arguments and instead checking later when determining whether an
> infinite result means overflow.  Appropriate testcases are added and
> existing ones made to verify that errno is unchanged.  (It does not do
> anything about bug 6796, missing errno setting on overflow from
> architecture-specific versions, or add any testcases relating to
> overflow.)
> 
> Tested x86_64 and x86.
> 
> 2013-08-21  Joseph Myers  <joseph@codesourcery.com>
> 
> 	[BZ #15797]
> 	* math/s_fdim.c (__fdim): Check for infinite arguments if result
> 	is infinite, not alongside NaN test.
> 	* math/s_fdimf.c (__fdimf): Likewise.
> 	* math/s_fdiml.c (__fdiml): Likewise.
> 	* math/libm-test.inc (fdim_test_data): Add more tests.  Test that
> 	errno is unchanged.

Ok, thanks,

Andreas
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