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139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/* Test floating-point environment includes SSE state (bug 16064).
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Copyright (C) 2014-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <cpuid.h>
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#include <fenv.h>
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#include <float.h>
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#include <stdbool.h>
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#include <stdio.h>
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static bool
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have_sse2 (void)
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{
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unsigned int eax, ebx, ecx, edx;
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if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
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return false;
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return (edx & bit_SSE2) != 0;
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}
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static __attribute__ ((noinline)) int
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sse_tests (void)
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{
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int ret = 0;
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fenv_t base_env;
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if (fegetenv (&base_env) != 0)
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{
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puts ("fegetenv (&base_env) failed");
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return 1;
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}
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if (fesetround (FE_UPWARD) != 0)
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{
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puts ("fesetround (FE_UPWARD) failed");
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return 1;
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}
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if (fesetenv (&base_env) != 0)
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{
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puts ("fesetenv (&base_env) failed");
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return 1;
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}
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volatile float a = 1.0f, b = FLT_MIN, c;
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c = a + b;
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if (c != 1.0f)
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{
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puts ("fesetenv did not restore rounding mode");
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ret = 1;
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}
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if (fesetround (FE_DOWNWARD) != 0)
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{
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puts ("fesetround (FE_DOWNWARD) failed");
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return 1;
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}
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if (feupdateenv (&base_env) != 0)
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{
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puts ("feupdateenv (&base_env) failed");
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return 1;
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}
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volatile float d = -FLT_MIN, e;
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e = a + d;
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if (e != 1.0f)
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{
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puts ("feupdateenv did not restore rounding mode");
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ret = 1;
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}
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if (fesetround (FE_UPWARD) != 0)
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{
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puts ("fesetround (FE_UPWARD) failed");
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return 1;
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}
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fenv_t upward_env;
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if (feholdexcept (&upward_env) != 0)
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{
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puts ("feholdexcept (&upward_env) failed");
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return 1;
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}
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if (fesetround (FE_DOWNWARD) != 0)
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{
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puts ("fesetround (FE_DOWNWARD) failed");
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return 1;
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}
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if (fesetenv (&upward_env) != 0)
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{
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puts ("fesetenv (&upward_env) failed");
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return 1;
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}
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e = a + d;
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if (e != 1.0f)
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{
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puts ("fesetenv did not restore rounding mode from feholdexcept");
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ret = 1;
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}
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if (fesetround (FE_UPWARD) != 0)
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{
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puts ("fesetround (FE_UPWARD) failed");
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return 1;
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}
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if (fesetenv (FE_DFL_ENV) != 0)
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{
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puts ("fesetenv (FE_DFL_ENV) failed");
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return 1;
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}
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c = a + b;
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if (c != 1.0f)
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{
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puts ("fesetenv (FE_DFL_ENV) did not restore rounding mode");
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ret = 1;
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}
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return ret;
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}
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static int
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do_test (void)
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{
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if (!have_sse2 ())
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{
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puts ("CPU does not support SSE2, cannot test");
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return 0;
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}
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return sse_tests ();
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}
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#define TEST_FUNCTION do_test ()
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#include <test-skeleton.c>
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