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* Copyright (C) 2007
* Wolfgang Denk, DENX Software Engineering,
* See file CREDITS for list of people who contributed to this
* project.
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
* This file is originally a part of the GCC testsuite.
* Check that certain subnormal numbers (formerly known as denormalized
* numbers) are rounded to within 0.5 ulp. PR other/14354.
#include <common.h>
#include <post.h>
union uf
unsigned int u;
float f;
static float
u2f (unsigned int v)
union uf u;
u.u = v;
return u.f;
static unsigned int
f2u (float v)
union uf u;
u.f = v;
return u.u;
static int ok = 1;
static void
tstmul (unsigned int ux, unsigned int uy, unsigned int ur)
float x = u2f (ux);
float y = u2f (uy);
if (f2u (x * y) != ur)
/* Set a variable rather than aborting here, to simplify tracing when
several computations are wrong. */
ok = 0;
/* We don't want to make this const and static, or else we risk inlining
causing the test to fold as constants at compile-time. */
unsigned int p1, p2, res;
} static volatile expected[] =
{0xfff, 0x3f800400, 0xfff},
{0xf, 0x3fc88888, 0x17},
{0xf, 0x3f844444, 0xf}
int fpu_post_test_math7 (void)
unsigned int i;
for (i = 0; i < ARRAY_SIZE(expected); i++)
tstmul (expected[i].p1, expected[i].p2, expected[i].res);
tstmul (expected[i].p2, expected[i].p1, expected[i].res);
if (!ok) {
post_log ("Error in FPU math7 test\n");
return -1;
return 0;