int32mask.h

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#ifndef int32mask_h
#define int32mask_h
 
#include <inttypes.h>
 
/* masks are -1 if condition holds, 0 if not */
 
static inline int32_t int32mask_negative(int32_t x)
{
  return x>>31; /* requires -fwrapv */
}
 
static inline int32_t int32mask_nonzero(int32_t x)
{
  return int32mask_negative(x)|int32mask_negative(-x);
}
 
static inline int32_t int32mask_zero(int32_t x)
{
  return ~int32mask_nonzero(x);
}
 
static inline int32_t int32mask_equal(int32_t x,int32_t y)
{
  return int32mask_zero(x^y);
}
 
#endif