GPGPU Programming for Games and Science

60 GPGPU Programming for Games and Science

if (exponent < binaryN : : NUM TRAIL ING BITS )

{

// Process the biased exponent and t r ai l in g simultaneously .

UInteger nonnegative = abs(x ); // a bs ( x) se ts s ign b it t o z e r o .

// E x t rac t d .

Integer d shi ft = binaryN : : NUM

TRAILING BITS − exponent ;

UInteger d = (nonnegative >> dshift );

// E x t rac t r .

Integer r sh if t = binaryN : : NUM

ENCODING BITS − dshift ;

UInteger r = (nonnegative << rshift );

// Enable for RoundToIntegralExact:

// i f ( r > 0) { Raise F l a gs ( SIGNAL

INEXACT ) ; }

// Round toward ne ga ti ve . I f the ” e l s e ” c la u se were present ,

// it would simply truncate ...