softfloat/i32_to_f64.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 float64_t i32_to_f64( int_fast32_t a )
  10 {
  11     uint_fast64_t uiZ;
  12     bool sign;
  13     uint_fast32_t absA;
  14     int shiftCount;
  15     union ui64_f64 uZ;
  16
  17     if ( ! a ) {
  18         uiZ = 0;
  19     } else {
  20         sign = ( a < 0 );
  21         absA = sign ? - a : a;
  22         shiftCount = softfloat_countLeadingZeros32( absA ) + 21;
  23         uiZ =
  24             packToF64UI(
  25                 sign, 0x432 - shiftCount, (uint_fast64_t) absA<<shiftCount );
  26     }
  27     uZ.ui = uiZ;
  28     return uZ.f;
  29
  30 }
  31