softfloat/f32_to_i32.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 int_fast32_t f32_to_i32( float32_t a, int_fast8_t roundingMode, bool exact )
  10 {
  11     union ui32_f32 uA;
  12     uint_fast32_t uiA;
  13     bool sign;
  14     int_fast16_t exp;
  15     uint_fast32_t sig;
  16     uint_fast64_t sig64;
  17     int_fast16_t shiftCount;
  18
  19     uA.f = a;
  20     uiA = uA.ui;
  21     sign = signF32UI( uiA );
  22     exp = expF32UI( uiA );
  23     sig = fracF32UI( uiA );
  24     if ( ( exp == 0xFF ) && sig ) sign = 0;
  25     if ( exp ) sig |= 0x00800000;
  26     sig64 = (uint_fast64_t) sig<<32;
  27     shiftCount = 0xAF - exp;
  28     if ( 0 < shiftCount ) {
  29         sig64 = softfloat_shift64RightJam( sig64, shiftCount );
  30     }
  31     return softfloat_roundPackToI32( sign, sig64, roundingMode, exact );
  32
  33 }
  34