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/* Test x86-specific floating-point environment (bug 16068): x87 part.
Copyright (C) 2015-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <fenv.h>
#include <float.h>
#include <fpu_control.h>
#include <stdint.h>
#include <stdio.h>
static uint16_t
get_x87_cw (void)
{
fpu_control_t cw;
_FPU_GETCW (cw);
return cw;
}
static void
set_x87_cw (uint16_t val)
{
fpu_control_t cw = val;
_FPU_SETCW (cw);
}
static void
set_x87_cw_bits (uint16_t mask, uint16_t bits)
{
uint16_t cw = get_x87_cw ();
cw = (cw & ~mask) | bits;
set_x87_cw (cw);
}
static int
test_x87_cw_bits (const char *test, uint16_t mask, uint16_t bits)
{
uint16_t cw = get_x87_cw ();
printf ("Testing %s: cw = %x\n", test, cw);
if ((cw & mask) == bits)
{
printf ("PASS: %s\n", test);
return 0;
}
else
{
printf ("FAIL: %s\n", test);
return 1;
}
}
static uint16_t
get_x87_sw (void)
{
uint16_t temp;
__asm__ __volatile__ ("fnstsw %0" : "=a" (temp));
return temp;
}
static void
set_x87_sw_bits (uint16_t mask, uint16_t bits)
{
fenv_t temp;
__asm__ __volatile__ ("fnstenv %0" : "=m" (temp));
temp.__status_word = (temp.__status_word & ~mask) | bits;
__asm__ __volatile__ ("fldenv %0" : : "m" (temp));
}
static int
test_x87_sw_bits (const char *test, uint16_t mask, uint16_t bits)
{
uint16_t sw = get_x87_sw ();
printf ("Testing %s: sw = %x\n", test, sw);
if ((sw & mask) == bits)
{
printf ("PASS: %s\n", test);
return 0;
}
else
{
printf ("FAIL: %s\n", test);
return 1;
}
}
#define X87_CW_PREC_MASK _FPU_EXTENDED
static int
do_test (void)
{
int result = 0;
fenv_t env1, env2;
/* Test precision mask. */
fegetenv (&env1);
set_x87_cw_bits (X87_CW_PREC_MASK, _FPU_SINGLE);
fegetenv (&env2);
fesetenv (&env1);
result |= test_x87_cw_bits ("fesetenv precision restoration",
X87_CW_PREC_MASK, _FPU_EXTENDED);
set_x87_cw_bits (X87_CW_PREC_MASK, _FPU_EXTENDED);
fesetenv (&env2);
result |= test_x87_cw_bits ("fesetenv precision restoration 2",
X87_CW_PREC_MASK, _FPU_SINGLE);
set_x87_cw_bits (X87_CW_PREC_MASK, _FPU_DOUBLE);
fesetenv (FE_NOMASK_ENV);
result |= test_x87_cw_bits ("fesetenv (FE_NOMASK_ENV) precision restoration",
X87_CW_PREC_MASK, _FPU_EXTENDED);
set_x87_cw_bits (X87_CW_PREC_MASK, _FPU_SINGLE);
fesetenv (FE_DFL_ENV);
result |= test_x87_cw_bits ("fesetenv (FE_DFL_ENV) precision restoration",
X87_CW_PREC_MASK, _FPU_EXTENDED);
/* Test x87 denormal operand masking. */
set_x87_cw_bits (_FPU_MASK_DM, 0);
fegetenv (&env2);
fesetenv (&env1);
result |= test_x87_cw_bits ("fesetenv denormal mask restoration",
_FPU_MASK_DM, _FPU_MASK_DM);
set_x87_cw_bits (_FPU_MASK_DM, _FPU_MASK_DM);
fesetenv (&env2);
result |= test_x87_cw_bits ("fesetenv denormal mask restoration 2",
_FPU_MASK_DM, 0);
set_x87_cw_bits (_FPU_MASK_DM, 0);
/* Presume FE_NOMASK_ENV should leave the "denormal operand"
exception masked, as not a standard exception. */
fesetenv (FE_NOMASK_ENV);
result |= test_x87_cw_bits ("fesetenv (FE_NOMASK_ENV) denormal mask "
"restoration",
_FPU_MASK_DM, _FPU_MASK_DM);
set_x87_cw_bits (_FPU_MASK_DM, 0);
fesetenv (FE_DFL_ENV);
result |= test_x87_cw_bits ("fesetenv (FE_DFL_ENV) denormal mask "
"restoration",
_FPU_MASK_DM, _FPU_MASK_DM);
/* Test x87 denormal operand exception. */
set_x87_sw_bits (__FE_DENORM, __FE_DENORM);
fegetenv (&env2);
fesetenv (&env1);
result |= test_x87_sw_bits ("fesetenv denormal exception restoration",
__FE_DENORM, 0);
set_x87_sw_bits (__FE_DENORM, 0);
fesetenv (&env2);
result |= test_x87_sw_bits ("fesetenv denormal exception restoration 2",
__FE_DENORM, __FE_DENORM);
set_x87_sw_bits (__FE_DENORM, __FE_DENORM);
fesetenv (FE_NOMASK_ENV);
result |= test_x87_sw_bits ("fesetenv (FE_NOMASK_ENV) exception restoration",
__FE_DENORM, 0);
set_x87_sw_bits (__FE_DENORM, __FE_DENORM);
fesetenv (FE_DFL_ENV);
result |= test_x87_sw_bits ("fesetenv (FE_DFL_ENV) exception restoration",
__FE_DENORM, 0);
return result;
}
#define TEST_FUNCTION do_test ()
#include <test-skeleton.c>
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