1 /* 2 * Copyright (C) 2007 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 /* 24 * This file is originally a part of the GCC testsuite. 25 * Check that certain subnormal numbers (formerly known as denormalized 26 * numbers) are rounded to within 0.5 ulp. PR other/14354. 27 */ 28 29 #include <common.h> 30 31 #include <post.h> 32 33 #if CONFIG_POST & CONFIG_SYS_POST_FPU 34 35 GNU_FPOST_ATTR 36 37 union uf 38 { 39 unsigned int u; 40 float f; 41 }; 42 43 static float 44 u2f (unsigned int v) 45 { 46 union uf u; 47 u.u = v; 48 return u.f; 49 } 50 51 static unsigned int 52 f2u (float v) 53 { 54 union uf u; 55 u.f = v; 56 return u.u; 57 } 58 59 static int ok = 1; 60 61 static void 62 tstmul (unsigned int ux, unsigned int uy, unsigned int ur) 63 { 64 float x = u2f (ux); 65 float y = u2f (uy); 66 67 if (f2u (x * y) != ur) 68 /* Set a variable rather than aborting here, to simplify tracing when 69 several computations are wrong. */ 70 ok = 0; 71 } 72 73 /* We don't want to make this const and static, or else we risk inlining 74 causing the test to fold as constants at compile-time. */ 75 struct 76 { 77 unsigned int p1, p2, res; 78 } static volatile expected[] = 79 { 80 {0xfff, 0x3f800400, 0xfff}, 81 {0xf, 0x3fc88888, 0x17}, 82 {0xf, 0x3f844444, 0xf} 83 }; 84 85 int fpu_post_test_math7 (void) 86 { 87 unsigned int i; 88 89 for (i = 0; i < sizeof (expected) / sizeof (expected[0]); i++) 90 { 91 tstmul (expected[i].p1, expected[i].p2, expected[i].res); 92 tstmul (expected[i].p2, expected[i].p1, expected[i].res); 93 } 94 95 if (!ok) { 96 post_log ("Error in FPU math7 test\n"); 97 return -1; 98 } 99 return 0; 100 } 101 102 #endif /* CONFIG_POST & CONFIG_SYS_POST_FPU */ 103