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[Bug math/15749] cbrtl fails for arguments > 1e308


http://sourceware.org/bugzilla/show_bug.cgi?id=15749

--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
The problem is that ldbl-96 cbrtl calls fabs when it should call fabsl.  
This will also result in spurious underflows for arguments that underflow 
doubles.  (It shouldn't cause significantly inaccurate results for other 
cases - the Newton-Raphson iterations should eliminate any significant 
consequences of xm being slightly inaccurate.)

There's a standing issue in the wiki todo list to improve libm-test.inc 
coverage of large and small input values including subnormals, which would 
have detected this issue (and I suspect various other bugs not yet found) 
- currently all finite nonzero test arguments to cbrt have absolute values 
between 0.001 and 27.

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