/* Need to constrain U32 to only 32 bits on 64 bit systems
 * For efficiency we only use the & 0xffffffff if required
 */

#define USING_64_BIT_INT /* save messing with Makefile.PL define */

#if defined(USING_64_BIT_INT)
#define MIX(a,b,c) \
{ \
  a &= 0xffffffff; b &= 0xffffffff; c &= 0xffffffff; \
  a -= b; a -= c; a ^= (c>>13); a &= 0xffffffff; \
  b -= c; b -= a; b ^= (a<<8);  b &= 0xffffffff; \
  c -= a; c -= b; c ^= (b>>13); c &= 0xffffffff; \
  a -= b; a -= c; a ^= (c>>12); a &= 0xffffffff; \
  b -= c; b -= a; b ^= (a<<16); b &= 0xffffffff; \
  c -= a; c -= b; c ^= (b>>5);  c &= 0xffffffff; \
  a -= b; a -= c; a ^= (c>>3);  a &= 0xffffffff; \
  b -= c; b -= a; b ^= (a<<10); b &= 0xffffffff; \
  c -= a; c -= b; c ^= (b>>15); c &= 0xffffffff; \
}
#else
#define MIX(a,b,c) \
{ \
  a -= b; a -= c; a ^= (c>>13); \
  b -= c; b -= a; b ^= (a<<8);  \
  c -= a; c -= b; c ^= (b>>13); \
  a -= b; a -= c; a ^= (c>>12); \
  b -= c; b -= a; b ^= (a<<16); \
  c -= a; c -= b; c ^= (b>>5);  \
  a -= b; a -= c; a ^= (c>>3);  \
  b -= c; b -= a; b ^= (a<<10); \
  c -= a; c -= b; c ^= (b>>15); \
}
#endif

/* rest of code unchanged with no masking */