2
* Fast, simple, yet decent quality random number generator based on
3
* a paper by David G. Carta ("Two Fast Implementations of the
4
* `Minimal Standard' Random Number Generator," Communications of the
7
* Copyright (C) 2002 Hewlett-Packard Co
8
* David Mosberger-Tang <davidm@hpl.hp.com>
11
#include <asm/asmmacro.h>
21
GLOBAL_ENTRY(carta_random32)
22
movl a = (16807 << 16) | 16807
24
pmpyshr2.u t0 = a, seed, 0
25
pmpyshr2.u t1 = a, seed, 16
33
dep t0 = 0, hi, 15, 49 // t0 = (hi & 0x7fff)
35
shl t0 = t0, 16 // t0 = (hi & 0x7fff) << 16
36
shr t1 = hi, 15 // t1 = (hi >> 15)
40
cmp.gtu p6, p0 = lo, m
48
cmp.gtu p6, p0 = lo, m