[src/trunk]: src/tests/include/sys Add also a basic, naive, test for fast_div...

[jruoho <jruoho%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f0de78b1d707
branches:  trunk
changeset: 763540:f0de78b1d707
user:      jruoho <jruoho%NetBSD.org@localhost>
date:      Thu Mar 24 07:37:04 2011 +0000

description:
Add also a basic, naive, test for fast_divide32(3).

diffstat:

 tests/include/sys/t_bitops.c |  39 ++++++++++++++++++++++++++++++++++++++-
 1 files changed, 38 insertions(+), 1 deletions(-)

diffs (60 lines):

diff -r 1a28db015abb -r f0de78b1d707 tests/include/sys/t_bitops.c
--- a/tests/include/sys/t_bitops.c      Thu Mar 24 07:28:28 2011 +0000
+++ b/tests/include/sys/t_bitops.c      Thu Mar 24 07:37:04 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_bitops.c,v 1.2 2011/03/24 07:06:34 jruoho Exp $ */
+/*     $NetBSD: t_bitops.c,v 1.3 2011/03/24 07:37:04 jruoho Exp $ */
 
 /*-
  * Copyright (c) 2011 The NetBSD Foundation, Inc.
@@ -59,6 +59,42 @@
 
 };
 
+ATF_TC(fast_divide32);
+ATF_TC_HEAD(fast_divide32, tc)
+{
+       atf_tc_set_md_var(tc, "descr", "A basic test of fast_divide32(3)");
+}
+
+ATF_TC_BODY(fast_divide32, tc)
+{
+       uint32_t a, b, q, r, m;
+       uint8_t i, s1, s2;
+
+       a = 0xFFFF;
+       b = 0x000F;
+
+       fast_divide32_prepare(b, &m, &s1, &s2);
+
+       q = fast_divide32(a, b, m, s1, s2);
+       r = fast_remainder32(a, b, m, s1, s2);
+
+       ATF_REQUIRE(q == 0x1111 && r == 0);
+
+       for (i = 1; i < __arraycount(bits); i++) {
+
+               a = bits[i].val;
+               b = bits[i].ffs;
+
+               fast_divide32_prepare(b, &m, &s1, &s2);
+
+               q = fast_divide32(a, b, m, s1, s2);
+               r = fast_remainder32(a, b, m, s1, s2);
+
+               ATF_REQUIRE(q == a / b);
+               ATF_REQUIRE(r == a % b);
+       }
+}
+
 ATF_TC(ffsfls);
 ATF_TC_HEAD(ffsfls, tc)
 {
@@ -140,6 +176,7 @@
 ATF_TP_ADD_TCS(tp)
 {
 
+       ATF_TP_ADD_TC(tp, fast_divide32);
        ATF_TP_ADD_TC(tp, ffsfls);
        ATF_TP_ADD_TC(tp, ilog2_1);
        ATF_TP_ADD_TC(tp, ilog2_2);