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

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