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* math: fix x86 asin, atan, exp, log1p to raise underflowSzabolcs Nagy2013-08-151-0/+10
| | | | | | underflow is raised by an inexact subnormal float store, since subnormal operations are slow, check the underflow flag and skip the store if it's already raised
* asm for inverse trig functionsRich Felker2012-03-191-0/+7
unlike trig functions, these are easy to do in asm because they do not involve (arbitrary-precision) argument reduction. fpatan automatically takes care of domain issues, and in asin and acos, fsqrt takes care of them for us.