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/* Test x86-specific floating-point environment (bug 16068): x87 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 <fenv.h>
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#include <float.h>
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#include <fpu_control.h>
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#include <stdint.h>
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#include <stdio.h>
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static uint16_t
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get_x87_cw (void)
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{
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fpu_control_t cw;
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_FPU_GETCW (cw);
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return cw;
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}
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static void
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set_x87_cw (uint16_t val)
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{
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fpu_control_t cw = val;
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_FPU_SETCW (cw);
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}
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static void
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set_x87_cw_bits (uint16_t mask, uint16_t bits)
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{
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uint16_t cw = get_x87_cw ();
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cw = (cw & ~mask) | bits;
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set_x87_cw (cw);
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}
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static int
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test_x87_cw_bits (const char *test, uint16_t mask, uint16_t bits)
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{
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uint16_t cw = get_x87_cw ();
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printf ("Testing %s: cw = %x\n", test, cw);
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if ((cw & 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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static uint16_t
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get_x87_sw (void)
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{
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uint16_t temp;
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__asm__ __volatile__ ("fnstsw %0" : "=a" (temp));
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return temp;
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}
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static void
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set_x87_sw_bits (uint16_t mask, uint16_t bits)
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{
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fenv_t temp;
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__asm__ __volatile__ ("fnstenv %0" : "=m" (temp));
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temp.__status_word = (temp.__status_word & ~mask) | bits;
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__asm__ __volatile__ ("fldenv %0" : : "m" (temp));
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}
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static int
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test_x87_sw_bits (const char *test, uint16_t mask, uint16_t bits)
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{
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uint16_t sw = get_x87_sw ();
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printf ("Testing %s: sw = %x\n", test, sw);
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if ((sw & 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 X87_CW_PREC_MASK _FPU_EXTENDED
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static int
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do_test (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 precision mask. */
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fegetenv (&env1);
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set_x87_cw_bits (X87_CW_PREC_MASK, _FPU_SINGLE);
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fegetenv (&env2);
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fesetenv (&env1);
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result |= test_x87_cw_bits ("fesetenv precision restoration",
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X87_CW_PREC_MASK, _FPU_EXTENDED);
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set_x87_cw_bits (X87_CW_PREC_MASK, _FPU_EXTENDED);
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fesetenv (&env2);
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result |= test_x87_cw_bits ("fesetenv precision restoration 2",
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X87_CW_PREC_MASK, _FPU_SINGLE);
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set_x87_cw_bits (X87_CW_PREC_MASK, _FPU_DOUBLE);
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fesetenv (FE_NOMASK_ENV);
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result |= test_x87_cw_bits ("fesetenv (FE_NOMASK_ENV) precision restoration",
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X87_CW_PREC_MASK, _FPU_EXTENDED);
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set_x87_cw_bits (X87_CW_PREC_MASK, _FPU_SINGLE);
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fesetenv (FE_DFL_ENV);
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result |= test_x87_cw_bits ("fesetenv (FE_DFL_ENV) precision restoration",
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X87_CW_PREC_MASK, _FPU_EXTENDED);
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/* Test x87 denormal operand masking. */
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set_x87_cw_bits (_FPU_MASK_DM, 0);
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fegetenv (&env2);
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fesetenv (&env1);
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result |= test_x87_cw_bits ("fesetenv denormal mask restoration",
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_FPU_MASK_DM, _FPU_MASK_DM);
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set_x87_cw_bits (_FPU_MASK_DM, _FPU_MASK_DM);
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fesetenv (&env2);
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result |= test_x87_cw_bits ("fesetenv denormal mask restoration 2",
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_FPU_MASK_DM, 0);
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set_x87_cw_bits (_FPU_MASK_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_x87_cw_bits ("fesetenv (FE_NOMASK_ENV) denormal mask "
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"restoration",
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_FPU_MASK_DM, _FPU_MASK_DM);
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set_x87_cw_bits (_FPU_MASK_DM, 0);
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fesetenv (FE_DFL_ENV);
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result |= test_x87_cw_bits ("fesetenv (FE_DFL_ENV) denormal mask "
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"restoration",
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_FPU_MASK_DM, _FPU_MASK_DM);
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/* Test x87 denormal operand exception. */
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set_x87_sw_bits (__FE_DENORM, __FE_DENORM);
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fegetenv (&env2);
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fesetenv (&env1);
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result |= test_x87_sw_bits ("fesetenv denormal exception restoration",
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__FE_DENORM, 0);
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set_x87_sw_bits (__FE_DENORM, 0);
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fesetenv (&env2);
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result |= test_x87_sw_bits ("fesetenv denormal exception restoration 2",
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__FE_DENORM, __FE_DENORM);
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set_x87_sw_bits (__FE_DENORM, __FE_DENORM);
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fesetenv (FE_NOMASK_ENV);
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result |= test_x87_sw_bits ("fesetenv (FE_NOMASK_ENV) exception restoration",
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__FE_DENORM, 0);
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set_x87_sw_bits (__FE_DENORM, __FE_DENORM);
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fesetenv (FE_DFL_ENV);
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result |= test_x87_sw_bits ("fesetenv (FE_DFL_ENV) exception restoration",
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__FE_DENORM, 0);
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return result;
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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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