softfloat/f64_to_ui32.c

   1
   2 #include <stdbool.h>
   3 #include <stdint.h>
   4 #include "platform.h"
   5 #include "primitives.h"
   6 #include "internals.h"
   7 #include "softfloat.h"
   8
   9 uint_fast32_t f64_to_ui32( float64_t a, int_fast8_t roundingMode, bool exact )
  10 {
  11     union ui64_f64 uA;
  12     uint_fast64_t uiA;
  13     bool sign;
  14     int_fast16_t exp;
  15     uint_fast64_t sig;
  16     int_fast16_t shiftCount;
  17
  18     uA.f = a;
  19     uiA = uA.ui;
  20     sign = signF64UI( uiA );
  21     exp = expF64UI( uiA );
  22     sig = fracF64UI( uiA );
  23     if ( exp ) sig |= UINT64_C( 0x0010000000000000 );
  24     shiftCount = 0x42C - exp;
  25     if ( 0 < shiftCount ) sig = softfloat_shift64RightJam( sig, shiftCount );
  26     return softfloat_roundPackToUI32( sign, sig, roundingMode, exact );
  27
  28 }
  29