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     The 8087 family of numeric coprocessor chips supports (in a
     limited way) an 80-bit precision floating-point data type. In
     Microsoft C version 6.0, the family of long double functions maps
     the C long double type into this 80-bit, 10-byte form. Unlike the
     regular functions (such as acos) which return values of type
     double, these long double functions (such as acosl) return values
     of type long double. The long double functions also return their
     values on the coprocessor stack for all calling conventions.
 
     The long double type is also supported by the addition of the 'l'
     suffix for a floating-point format specification in the printf and
     scanf family of functions.
 
     The regular C run-time functions and their corresponding long
     double equivalents are listed below:
 
     Regular Function     Long Double Form
 
     acos                 acosl
     asin                 asinl
     atan                 atanl
     atan2                atan2l
     atof                 atold
     cabs                 cabsl
     ceil                 ceill
     cos                  cosl
     cosh                 coshl
     exp                  expl
     fabs                 fabsl
     floor                floorl
     fmod                 fmodl
     frexp                frexpl
     hypot                hypotl
     ldexp                ldexpl
     log                  logl
     log10                log10l
     matherr              _matherrl
     modf                 modfl
     pow                  powl
     sin                  sinl
     sinh                 sinhl
     sqrt                 sqrtl
     tan                  tanl
     tanh                 tanhl
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