softfloat/s_sub192.c

   1
   2 #include <stdint.h>
   3 #include "platform.h"
   4 #include "primitives.h"
   5
   6 struct uint192
   7  softfloat_sub192(
   8      uint64_t a128,
   9      uint64_t a64,
  10      uint64_t a0,
  11      uint64_t b128,
  12      uint64_t b64,
  13      uint64_t b0
  14  )
  15 {
  16     struct uint192 z;
  17     unsigned int borrow64, borrow128;
  18
  19     z.v0 = a0 - b0;
  20     borrow64 = ( a0 < b0 );
  21     z.v64 = a64 - b64;
  22     borrow128 = ( a64 < b64 );
  23     z.v128 = a128 - b128;
  24     borrow128 += ( z.v64 < borrow64 );
  25     z.v64 -= borrow64;
  26     z.v128 -= borrow128;
  27     return z;
  28
  29 }
  30