Fix clog overflow/underflow (bug 13629)

[Andreas Jaeger]

On 03/19/2012 07:12 PM, Joseph S. Myers wrote:
 > [...]
> 2012-03-19  Joseph Myers<joseph@codesourcery.com>
>
> 	[BZ #13629]
> 	* math/s_clog.c: Include<float.h>.
> 	(__clog): Scale large or subnormal inputs.
> 	* math/s_clogf.c: Likewise.
> 	* math/s_clogl.c: Likewise.
> 	* math/s_clog10.c: Include<float.h>.
> 	(M_LOG10_2): Define.
> 	(__clog10): Scale large or subnormal inputs.
> 	* math/s_clog10f.c: Likewise.
> 	* math/s_clog10l.c: Likewise.
> 	* math/libm-test.inc (clog_test): Add more tests.
> 	(clog10_test): Likewise.
> 	* sysdeps/i386/fpu/libm-test-ulps: Update.
> 	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.

This looks good, thanks,

Andreas
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