softfloat/SoftFloat-3/source/f64_to_ui32_r_minMag.c

   1
   2 #include <stdbool.h>
   3 #include <stdint.h>
   4 #include "platform.h"
   5 #include "internals.h"
   6 #include "softfloat.h"
   7
   8 uint_fast32_t f64_to_ui32_r_minMag( float64_t a, bool exact )
   9 {
  10     union ui64_f64 uA;
  11     uint_fast64_t uiA;
  12     int_fast16_t exp;
  13     uint_fast64_t sig;
  14     int_fast16_t shiftCount;
  15     uint_fast32_t z;
  16
  17     uA.f = a;
  18     uiA = uA.ui;
  19     exp = expF64UI( uiA );
  20     sig = fracF64UI( uiA );
  21     if ( exp < 0x3FF ) {
  22         if ( exact && ( exp | sig ) ) {
  23             softfloat_exceptionFlags |= softfloat_flag_inexact;
  24         }
  25         return 0;
  26     }
  27     if ( signF64UI( uiA ) || ( 0x41E < exp ) ) {
  28         softfloat_raiseFlags( softfloat_flag_invalid );
  29         return 0xFFFFFFFF;
  30     }
  31     sig |= UINT64_C( 0x0010000000000000 );
  32     shiftCount = 0x433 - exp;
  33     z = sig>>shiftCount;
  34     if ( exact && ( (uint_fast64_t) z<<shiftCount != sig ) ) {
  35         softfloat_exceptionFlags |= softfloat_flag_inexact;
  36     }
  37     return z;
  38
  39 }
  40