softfloat/f32_sub.c

   1
   2 #include <stdbool.h>
   3 #include <stdint.h>
   4 #include "platform.h"
   5 #include "internals.h"
   6 #include "softfloat.h"
   7
   8 float32_t f32_sub( float32_t a, float32_t b )
   9 {
  10     union ui32_f32 uA;
  11     uint_fast32_t uiA;
  12     bool signA;
  13     union ui32_f32 uB;
  14     uint_fast32_t uiB;
  15     bool signB;
  16     float32_t ( *magsRoutine )( uint_fast32_t, uint_fast32_t, bool );
  17
  18     uA.f = a;
  19     uiA = uA.ui;
  20     signA = signF32UI( uiA );
  21     uB.f = b;
  22     uiB = uB.ui;
  23     signB = signF32UI( uiB );
  24     magsRoutine =
  25         ( signA == signB ) ? softfloat_subMagsF32 : softfloat_addMagsF32;
  26     return magsRoutine( uiA, uiB ^ 0x80000000, signA );
  27
  28 }
  29