Class: LFSR::Fast::Size43

Inherits:
LFSR_Base
  • Object
show all
Defined in:
ext/lfsr/lfsr.c

Constant Summary collapse

MASK = 
ULL2NUM(0x7ffffffffffLLU)

Instance Method Summary collapse

Instance Method Details

#next_i ⇒ Object 



499
500
501
502
503
504
505
506
507
508
509
 
# File 'ext/lfsr/lfsr.c', line 499

VALUE rb_lfsr_next_i_43(VALUE self) {
  unsigned long long reg = NUM2ULL(ROBJECT(self)->as.ary[0]), max = NUM2ULL(ROBJECT(self)->as.ary[1]);

  label_shift43:
  reg = (reg >> 1) | ((bit(0)^bit(1)^bit(5)^bit(6)) << 0x2a);
  if (reg > max) goto label_shift43;

  ROBJECT(self)->as.ary[0] = ULL2NUM(reg);

  return ULL2NUM(reg - 1);
}