@node machine,,syscalls,Top@chapter NEC V70 Specific FunctionsThe NEC V70 has machine instructions for fast IEEE floating point,including operations normally provided by the library.  When you use the @file{/usr/include/fastmath.h} header file, thenames of several library math functions are redefined to call the@code{fastmath} routine (using the corresponding V70 machine instructions)whenever possible.For example,@example#include <fastmath.h>double sqsin(x)double x;@{  return sin(x*x);@}@end exampleexpands into the code@example@dots{}double sqsin(x)double x;@{  return fast_sin(x*x);@}@end exampleThe library has an entry @code{fast_sin} which uses the machineinstruction @code{fsin.l} to perform the operation.  Note that thebuilt-in instructions cannot call @code{matherr} or set @code{errno}in the same way that the C coded functions do.  Refer to a V70instruction manual to see how errors are generated and handled.Also, the library provides true @code{float} entry points.  The@code{fast_sinf} entry point really performs a @code{fsin.s}operation.  Because of this, the instructions are only useful whenusing code compiled with an ANSI C compiler.  The prototypesand definitions for the floating point versions of the math libraryroutines are only defined if compiling a module with an ANSI Ccompiler.@page@section Entry points The functions provided by @file{fastmath.h} are@example double fast_sin(double);	/*	fsin.l */ double fast_cos(double);	/*	fcos.l */ double fast_tan(double);	/*	ftan.l */ double fast_asin(double);	/*	fasin.l */ double fast_acos(double);	/*	facos.l */ double fast_atan(double);	/*	fatan.l */ double fast_sinh(double);	/*	fsinh.l */ double fast_cosh(double);	/*	fcosh.l */ double fast_tanh(double);	/*	ftanh.l */ double fast_asinh(double);	/*	fasinh.l */ double fast_acosh(double);	/*	facosh.l */ double fast_atanh(double);	/*	fatanh.l */ double fast_fabs(double);	/*	fabs.l */ double fast_sqrt(double);	/*	fsqrt.l */ double fast_exp2(double);	/*	fexp2.l */ double fast_exp10(double);	/*	fexp10.l */ double fast_expe(double);	/*	fexpe.l */ double fast_log10(double);	/*	flog10.l */ double fast_log2(double);	/*	flog2.l */ double fast_loge(double);	/*	floge.l */ float fast_sinf(float);	/*	fsin.s */ float fast_cosf(float);	/*	fcos.s */ float fast_tanf(float);	/*	ftan.s */ float fast_asinf(float);	/*	fasin.s */ float fast_acosf(float);	/*	facos.s */ float fast_atanf(float);	/*	fatan.s */ float fast_sinhf(float);	/*	fsinh.s */ float fast_coshf(float);	/*	fcosh.s */ float fast_tanhf(float);	/*	ftanh.s */ float fast_asinhf(float);	/*	fasinh.s */ float fast_acoshf(float);	/*	facosh.s */ float fast_atanhf(float);	/*	fatanh.s */ float fast_fabsf(float);	/*	fabs.s */ float fast_sqrtf(float);	/*	fsqrt.s */ float fast_exp2f(float);	/*	fexp2.s */ float fast_exp10f(float);	/*	fexp10.s */ float fast_expef(float);	/*	fexpe.s */ float fast_log10f(float);	/*	flog10.s */ float fast_log2f(float);	/*	flog2.s */ float fast_logef(float);	/*	floge.s */@end example