softfloat/ui64_to_f32.c

   1
   2 #include <stdint.h>
   3 #include "platform.h"
   4 #include "primitives.h"
   5 #include "internals.h"
   6 #include "softfloat.h"
   7
   8 float32_t ui64_to_f32( uint_fast64_t a )
   9 {
  10     int shiftCount;
  11     union ui32_f32 u;
  12     uint_fast32_t sig;
  13
  14     shiftCount = softfloat_countLeadingZeros64( a ) - 40;
  15     if ( 0 <= shiftCount ) {
  16         u.ui =
  17             a ? packToF32UI(
  18                     0, 0x95 - shiftCount, (uint_fast32_t) a<<shiftCount )
  19                 : 0;
  20         return u.f;
  21     } else {
  22         shiftCount += 7;
  23         sig =
  24             ( shiftCount < 0 )
  25                 ? softfloat_shortShift64RightJam( a, - shiftCount )
  26                 : (uint_fast32_t) a<<shiftCount;
  27         return softfloat_roundPackToF32( 0, 0x9C - shiftCount, sig );
  28     }
  29
  30 }
  31