LXR uboot/post/lib_powerpc/fpu/mul-subnormal-single-1.c

   1/*
   2 * Copyright (C) 2007
   3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7/*
   8 * This file is originally a part of the GCC testsuite.
   9 * Check that certain subnormal numbers (formerly known as denormalized
  10 * numbers) are rounded to within 0.5 ulp.  PR other/14354.
  11 */
  12
  13#include <common.h>
  14
  15#include <post.h>
  16
  17GNU_FPOST_ATTR
  18
  19#if CONFIG_POST & CONFIG_SYS_POST_FPU
  20
  21union uf
  22{
  23        unsigned int u;
  24        float f;
  25};
  26
  27static float
  28u2f (unsigned int v)
  29{
  30        union uf u;
  31        u.u = v;
  32        return u.f;
  33}
  34
  35static unsigned int
  36f2u (float v)
  37{
  38        union uf u;
  39        u.f = v;
  40        return u.u;
  41}
  42
  43static int ok = 1;
  44
  45static void
  46tstmul (unsigned int ux, unsigned int uy, unsigned int ur)
  47{
  48        float x = u2f (ux);
  49        float y = u2f (uy);
  50
  51        if (f2u (x * y) != ur)
  52        /* Set a variable rather than aborting here, to simplify tracing when
  53           several computations are wrong.  */
  54                ok = 0;
  55}
  56
  57/* We don't want to make this const and static, or else we risk inlining
  58   causing the test to fold as constants at compile-time.  */
  59struct
  60{
  61  unsigned int p1, p2, res;
  62} static volatile expected[] =
  63{
  64        {0xfff, 0x3f800400, 0xfff},
  65        {0xf, 0x3fc88888, 0x17},
  66        {0xf, 0x3f844444, 0xf}
  67};
  68
  69int fpu_post_test_math7 (void)
  70{
  71        unsigned int i;
  72
  73        for (i = 0; i < ARRAY_SIZE(expected); i++)
  74        {
  75                tstmul (expected[i].p1, expected[i].p2, expected[i].res);
  76                tstmul (expected[i].p2, expected[i].p1, expected[i].res);
  77        }
  78
  79        if (!ok) {
  80                post_log ("Error in FPU math7 test\n");
  81                return -1;
  82        }
  83        return 0;
  84}
  85
  86#endif /* CONFIG_POST & CONFIG_SYS_POST_FPU */
  87