Add libm-test support for ignored return value, add more lrint / llrint / lround / llround tests

[Andreas Jaeger]

On 11/13/2013 06:04 PM, Joseph S. Myers wrote:
> For some libm functions on some inputs, the return value isn't
> specified although the exceptions raised are.  Specifically, this
> applies to lrint / llrint / lround / llround for infinite and NaN
> arguments and overflowing finite arguments.
> 
> This patch, relative to a tree with
> <https://sourceware.org/ml/libc-alpha/2013-11/msg00393.html> and
> <https://sourceware.org/ml/libc-alpha/2013-11/msg00408.html> applied,
> adds libm-test support for testing such cases, and adds such tests for
> infinite and NaN arguments to those functions.  (Tests of overflowing
> finite arguments to those functions, as in bug 15470, are still
> needed.)
> 
> Tested x86_64 and x86.

ok, thanks,

Andreas
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