From 3ea2e82dc7b32703f5043c3b30b049905a0d07aa Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Fri, 9 Oct 2009 20:59:04 +0200 Subject: ash: factor out $RANDOM support function old new delta next_random - 46 +46 ash_main 1361 1356 -5 change_random 132 97 -35 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/2 up/down: 46/-40) Total: 6 bytes Signed-off-by: Denys Vlasenko --- shell/random.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 shell/random.h (limited to 'shell/random.h') diff --git a/shell/random.h b/shell/random.h new file mode 100644 index 000000000..2d29a60e8 --- /dev/null +++ b/shell/random.h @@ -0,0 +1,19 @@ +/* vi: set sw=4 ts=4: */ +/* + * $RANDOM support. + * + * Copyright (C) 2008 Denys Vlasenko + * + * Licensed under GPLv2, see file LICENSE in this tarball for details. + */ + +typedef struct random_t { + /* Random number generators */ + int32_t galois_LFSR; /* Galois LFSR (fast but weak). signed! */ + uint32_t LCG; /* LCG (fast but weak) */ +} random_t; + +#define INIT_RANDOM_T(rnd, nonzero, v) \ + ((rnd)->galois_LFSR = (nonzero), (rnd)->LCG = (v)) + +uint32_t next_random(random_t *rnd) FAST_FUNC; -- cgit v1.2.3