Class: LFSR::Fast::Size29
- Inherits:
-
LFSR_Base
- Object
- LFSR_Base
- LFSR::Fast::Size29
- Defined in:
- ext/lfsr/lfsr.c
Constant Summary collapse
- MASK =
ULL2NUM(0x1fffffffLLU)
Instance Method Summary collapse
Instance Method Details
#next_i ⇒ Object
331 332 333 334 335 336 337 338 339 340 341 |
# File 'ext/lfsr/lfsr.c', line 331
VALUE rb_lfsr_next_i_29(VALUE self) {
unsigned long long reg = NUM2ULL(ROBJECT(self)->as.ary[0]), max = NUM2ULL(ROBJECT(self)->as.ary[1]);
label_shift29:
reg = (reg >> 1) | ((bit(0)^bit(1)^bit(2)^bit(4)) << 0x1c);
if (reg > max) goto label_shift29;
ROBJECT(self)->as.ary[0] = ULL2NUM(reg);
return ULL2NUM(reg - 1);
}
|