softfloat/f64_lt.c

   1
   2 #include <stdbool.h>
   3 #include <stdint.h>
   4 #include "platform.h"
   5 #include "internals.h"
   6 #include "softfloat.h"
   7
   8 bool f64_lt( float64_t a, float64_t b )
   9 {
  10     union ui64_f64 uA;
  11     uint_fast64_t uiA;
  12     union ui64_f64 uB;
  13     uint_fast64_t uiB;
  14     bool signA, signB;
  15
  16     uA.f = a;
  17     uiA = uA.ui;
  18     uB.f = b;
  19     uiB = uB.ui;
  20     if (
  21            ( ( expF64UI( uiA ) == 0x7FF ) && fracF64UI( uiA ) )
  22         || ( ( expF64UI( uiB ) == 0x7FF ) && fracF64UI( uiB ) )
  23     ) {
  24         softfloat_raiseFlags( softfloat_flag_invalid );
  25         return false;
  26     }
  27     signA = signF64UI( uiA );
  28     signB = signF64UI( uiB );
  29     return
  30         ( signA != signB )
  31             ? signA && ( ( uiA | uiB ) & UINT64_C( 0x7FFFFFFFFFFFFFFF ) )
  32             : ( uiA != uiB ) && ( signA ^ ( uiA < uiB ) );
  33
  34 }
  35