mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 20:30:57 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
55 lines
1.0 KiB
ArmAsm
55 lines
1.0 KiB
ArmAsm
/*
|
|
* Fast, simple, yet decent quality random number generator based on
|
|
* a paper by David G. Carta ("Two Fast Implementations of the
|
|
* `Minimal Standard' Random Number Generator," Communications of the
|
|
* ACM, January, 1990).
|
|
*
|
|
* Copyright (C) 2002 Hewlett-Packard Co
|
|
* David Mosberger-Tang <davidm@hpl.hp.com>
|
|
*/
|
|
|
|
#include <asm/asmmacro.h>
|
|
|
|
#define a r2
|
|
#define m r3
|
|
#define lo r8
|
|
#define hi r9
|
|
#define t0 r16
|
|
#define t1 r17
|
|
#define seed r32
|
|
|
|
GLOBAL_ENTRY(carta_random32)
|
|
movl a = (16807 << 16) | 16807
|
|
;;
|
|
pmpyshr2.u t0 = a, seed, 0
|
|
pmpyshr2.u t1 = a, seed, 16
|
|
;;
|
|
unpack2.l t0 = t1, t0
|
|
dep m = -1, r0, 0, 31
|
|
;;
|
|
zxt4 lo = t0
|
|
shr.u hi = t0, 32
|
|
;;
|
|
dep t0 = 0, hi, 15, 49 // t0 = (hi & 0x7fff)
|
|
;;
|
|
shl t0 = t0, 16 // t0 = (hi & 0x7fff) << 16
|
|
shr t1 = hi, 15 // t1 = (hi >> 15)
|
|
;;
|
|
add lo = lo, t0
|
|
;;
|
|
cmp.gtu p6, p0 = lo, m
|
|
;;
|
|
(p6) and lo = lo, m
|
|
;;
|
|
(p6) add lo = 1, lo
|
|
;;
|
|
add lo = lo, t1
|
|
;;
|
|
cmp.gtu p6, p0 = lo, m
|
|
;;
|
|
(p6) and lo = lo, m
|
|
;;
|
|
(p6) add lo = 1, lo
|
|
br.ret.sptk.many rp
|
|
END(carta_random32)
|