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/* Test x86-specific floating-point environment (bug 16068): SSE part.
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Copyright (C) 2015-2018 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 <stdint.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 uint32_t
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get_sse_mxcsr (void)
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{
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uint32_t temp;
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__asm__ __volatile__ ("stmxcsr %0" : "=m" (temp));
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return temp;
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}
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static void
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set_sse_mxcsr (uint32_t val)
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{
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__asm__ __volatile__ ("ldmxcsr %0" : : "m" (val));
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}
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static void
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set_sse_mxcsr_bits (uint32_t mask, uint32_t bits)
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{
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uint32_t mxcsr = get_sse_mxcsr ();
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mxcsr = (mxcsr & ~mask) | bits;
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set_sse_mxcsr (mxcsr);
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}
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static int
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test_sse_mxcsr_bits (const char *test, uint32_t mask, uint32_t bits)
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{
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uint32_t mxcsr = get_sse_mxcsr ();
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printf ("Testing %s: mxcsr = %x\n", test, mxcsr);
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if ((mxcsr & mask) == bits)
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{
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printf ("PASS: %s\n", test);
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return 0;
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}
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else
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{
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printf ("FAIL: %s\n", test);
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return 1;
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}
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}
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#define MXCSR_FZ 0x8000
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#define MXCSR_DAZ 0x40
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#define MXCSR_DE 0x2
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#define MXCSR_DM 0x100
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static __attribute__ ((noinline)) int
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sse_tests (void)
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{
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int result = 0;
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fenv_t env1, env2;
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/* Test FZ bit. */
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fegetenv (&env1);
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set_sse_mxcsr_bits (MXCSR_FZ, MXCSR_FZ);
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fegetenv (&env2);
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fesetenv (&env1);
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result |= test_sse_mxcsr_bits ("fesetenv FZ restoration",
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MXCSR_FZ, 0);
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set_sse_mxcsr_bits (MXCSR_FZ, 0);
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fesetenv (&env2);
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result |= test_sse_mxcsr_bits ("fesetenv FZ restoration 2",
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MXCSR_FZ, MXCSR_FZ);
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set_sse_mxcsr_bits (MXCSR_FZ, MXCSR_FZ);
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fesetenv (FE_NOMASK_ENV);
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result |= test_sse_mxcsr_bits ("fesetenv (FE_NOMASK_ENV) FZ restoration",
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MXCSR_FZ, 0);
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set_sse_mxcsr_bits (MXCSR_FZ, MXCSR_FZ);
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fesetenv (FE_DFL_ENV);
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result |= test_sse_mxcsr_bits ("fesetenv (FE_DFL_ENV) FZ restoration",
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MXCSR_FZ, 0);
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/* Test DAZ bit. */
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set_sse_mxcsr_bits (MXCSR_DAZ, MXCSR_DAZ);
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fegetenv (&env2);
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fesetenv (&env1);
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result |= test_sse_mxcsr_bits ("fesetenv DAZ restoration",
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MXCSR_DAZ, 0);
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set_sse_mxcsr_bits (MXCSR_DAZ, 0);
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fesetenv (&env2);
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result |= test_sse_mxcsr_bits ("fesetenv DAZ restoration 2",
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MXCSR_DAZ, MXCSR_DAZ);
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set_sse_mxcsr_bits (MXCSR_DAZ, MXCSR_DAZ);
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fesetenv (FE_NOMASK_ENV);
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result |= test_sse_mxcsr_bits ("fesetenv (FE_NOMASK_ENV) DAZ restoration",
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MXCSR_DAZ, 0);
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set_sse_mxcsr_bits (MXCSR_DAZ, MXCSR_DAZ);
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fesetenv (FE_DFL_ENV);
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result |= test_sse_mxcsr_bits ("fesetenv (FE_DFL_ENV) DAZ restoration",
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MXCSR_DAZ, 0);
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/* Test DM bit. */
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set_sse_mxcsr_bits (MXCSR_DM, 0);
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fegetenv (&env2);
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fesetenv (&env1);
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result |= test_sse_mxcsr_bits ("fesetenv DM restoration",
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MXCSR_DM, MXCSR_DM);
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set_sse_mxcsr_bits (MXCSR_DM, MXCSR_DM);
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fesetenv (&env2);
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result |= test_sse_mxcsr_bits ("fesetenv DM restoration 2",
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MXCSR_DM, 0);
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set_sse_mxcsr_bits (MXCSR_DM, 0);
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/* Presume FE_NOMASK_ENV should leave the "denormal operand"
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exception masked, as not a standard exception. */
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fesetenv (FE_NOMASK_ENV);
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result |= test_sse_mxcsr_bits ("fesetenv (FE_NOMASK_ENV) DM restoration",
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MXCSR_DM, MXCSR_DM);
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set_sse_mxcsr_bits (MXCSR_DM, 0);
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fesetenv (FE_DFL_ENV);
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result |= test_sse_mxcsr_bits ("fesetenv (FE_DFL_ENV) DM restoration",
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MXCSR_DM, MXCSR_DM);
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/* Test DE bit. */
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set_sse_mxcsr_bits (MXCSR_DE, MXCSR_DE);
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fegetenv (&env2);
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fesetenv (&env1);
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result |= test_sse_mxcsr_bits ("fesetenv DE restoration",
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MXCSR_DE, 0);
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set_sse_mxcsr_bits (MXCSR_DE, 0);
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fesetenv (&env2);
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result |= test_sse_mxcsr_bits ("fesetenv DE restoration 2",
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MXCSR_DE, MXCSR_DE);
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set_sse_mxcsr_bits (MXCSR_DE, MXCSR_DE);
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fesetenv (FE_NOMASK_ENV);
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result |= test_sse_mxcsr_bits ("fesetenv (FE_NOMASK_ENV) DE restoration",
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MXCSR_DE, 0);
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set_sse_mxcsr_bits (MXCSR_DE, MXCSR_DE);
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fesetenv (FE_DFL_ENV);
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result |= test_sse_mxcsr_bits ("fesetenv (FE_DFL_ENV) DE restoration",
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MXCSR_DE, 0);
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return result;
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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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