softfloat/s_mul128To256.c

   1
   2 #include <stdint.h>
   3 #include "platform.h"
   4 #include "primitives.h"
   5
   6 struct uint256
   7  softfloat_mul128To256( uint64_t a64, uint64_t a0, uint64_t b64, uint64_t b0 )
   8 {
   9     struct uint128 p0, p64, p128;
  10     struct uint256 z;
  11
  12     p0 = softfloat_mul64To128( a0, b0 );
  13     z.v0 = p0.v0;
  14     p64 = softfloat_mul64To128( a64, b0 );
  15     z.v64 = p64.v0 + p0.v64;
  16     z.v128 = p64.v64 + ( z.v64 < p64.v0 );
  17     p128 = softfloat_mul64To128( a64, b64 );
  18     z.v128 += p128.v0;
  19     z.v192 = p128.v64 + ( z.v128 < p128.v0 );
  20     p64 = softfloat_mul64To128( a0, b64 );
  21     z.v64 += p64.v0;
  22     p64.v64 += ( z.v64 < p64.v0 );
  23     z.v128 += p64.v64;
  24     z.v192 += ( z.v128 < p64.v64 );
  25     return z;
  26
  27 }
  28