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
  16 GNU_FPOST_ATTR
  17
  18 #if CFG_POST & CONFIG_SYS_POST_FPU
  19
  20 union uf
  21 {
  22         unsigned int u;
  23         float f;
  24 };
  25
  26 static float
  27 u2f (unsigned int v)
  28 {
  29         union uf u;
  30         u.u = v;
  31         return u.f;
  32 }
  33
  34 static unsigned int
  35 f2u (float v)
  36 {
  37         union uf u;
  38         u.f = v;
  39         return u.u;
  40 }
  41
  42 static int ok = 1;
  43
  44 static void
  45 tstmul (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.  */
  58 struct
  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
  68 int 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 /* CFG_POST & CONFIG_SYS_POST_FPU */