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/* Test x86-specific floating-point environment (bug 16068): SSE part.
Copyright (C) 2015-2025 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 <cpuid.h>
#include <fenv.h>
#include <float.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <cpu-features.h>
#include <support/check.h>
static uint32_t
get_sse_mxcsr (void)
{
uint32_t temp;
__asm__ __volatile__ ("stmxcsr %0" : "=m" (temp));
return temp;
}
static void
set_sse_mxcsr (uint32_t val)
{
__asm__ __volatile__ ("ldmxcsr %0" : : "m" (val));
}
static void
set_sse_mxcsr_bits (uint32_t mask, uint32_t bits)
{
uint32_t mxcsr = get_sse_mxcsr ();
mxcsr = (mxcsr & ~mask) | bits;
set_sse_mxcsr (mxcsr);
}
static int
test_sse_mxcsr_bits (const char *test, uint32_t mask, uint32_t bits)
{
uint32_t mxcsr = get_sse_mxcsr ();
printf ("Testing %s: mxcsr = %x\n", test, mxcsr);
if ((mxcsr & mask) == bits)
{
printf ("PASS: %s\n", test);
return 0;
}
else
{
printf ("FAIL: %s\n", test);
return 1;
}
}
#define MXCSR_FZ 0x8000
#define MXCSR_DAZ 0x40
#define MXCSR_DE 0x2
#define MXCSR_DM 0x100
static __attribute__ ((noinline)) int
sse_tests (void)
{
int result = 0;
fenv_t env1, env2;
/* Test FZ bit. */
fegetenv (&env1);
set_sse_mxcsr_bits (MXCSR_FZ, MXCSR_FZ);
fegetenv (&env2);
fesetenv (&env1);
result |= test_sse_mxcsr_bits ("fesetenv FZ restoration",
MXCSR_FZ, 0);
set_sse_mxcsr_bits (MXCSR_FZ, 0);
fesetenv (&env2);
result |= test_sse_mxcsr_bits ("fesetenv FZ restoration 2",
MXCSR_FZ, MXCSR_FZ);
set_sse_mxcsr_bits (MXCSR_FZ, MXCSR_FZ);
fesetenv (FE_NOMASK_ENV);
result |= test_sse_mxcsr_bits ("fesetenv (FE_NOMASK_ENV) FZ restoration",
MXCSR_FZ, 0);
set_sse_mxcsr_bits (MXCSR_FZ, MXCSR_FZ);
fesetenv (FE_DFL_ENV);
result |= test_sse_mxcsr_bits ("fesetenv (FE_DFL_ENV) FZ restoration",
MXCSR_FZ, 0);
/* Test DAZ bit. */
set_sse_mxcsr_bits (MXCSR_DAZ, MXCSR_DAZ);
fegetenv (&env2);
fesetenv (&env1);
result |= test_sse_mxcsr_bits ("fesetenv DAZ restoration",
MXCSR_DAZ, 0);
set_sse_mxcsr_bits (MXCSR_DAZ, 0);
fesetenv (&env2);
result |= test_sse_mxcsr_bits ("fesetenv DAZ restoration 2",
MXCSR_DAZ, MXCSR_DAZ);
set_sse_mxcsr_bits (MXCSR_DAZ, MXCSR_DAZ);
fesetenv (FE_NOMASK_ENV);
result |= test_sse_mxcsr_bits ("fesetenv (FE_NOMASK_ENV) DAZ restoration",
MXCSR_DAZ, 0);
set_sse_mxcsr_bits (MXCSR_DAZ, MXCSR_DAZ);
fesetenv (FE_DFL_ENV);
result |= test_sse_mxcsr_bits ("fesetenv (FE_DFL_ENV) DAZ restoration",
MXCSR_DAZ, 0);
/* Test DM bit. */
set_sse_mxcsr_bits (MXCSR_DM, 0);
fegetenv (&env2);
fesetenv (&env1);
result |= test_sse_mxcsr_bits ("fesetenv DM restoration",
MXCSR_DM, MXCSR_DM);
set_sse_mxcsr_bits (MXCSR_DM, MXCSR_DM);
fesetenv (&env2);
result |= test_sse_mxcsr_bits ("fesetenv DM restoration 2",
MXCSR_DM, 0);
set_sse_mxcsr_bits (MXCSR_DM, 0);
/* Presume FE_NOMASK_ENV should leave the "denormal operand"
exception masked, as not a standard exception. */
fesetenv (FE_NOMASK_ENV);
result |= test_sse_mxcsr_bits ("fesetenv (FE_NOMASK_ENV) DM restoration",
MXCSR_DM, MXCSR_DM);
set_sse_mxcsr_bits (MXCSR_DM, 0);
fesetenv (FE_DFL_ENV);
result |= test_sse_mxcsr_bits ("fesetenv (FE_DFL_ENV) DM restoration",
MXCSR_DM, MXCSR_DM);
/* Test DE bit. */
set_sse_mxcsr_bits (MXCSR_DE, MXCSR_DE);
fegetenv (&env2);
fesetenv (&env1);
result |= test_sse_mxcsr_bits ("fesetenv DE restoration",
MXCSR_DE, 0);
set_sse_mxcsr_bits (MXCSR_DE, 0);
fesetenv (&env2);
result |= test_sse_mxcsr_bits ("fesetenv DE restoration 2",
MXCSR_DE, MXCSR_DE);
set_sse_mxcsr_bits (MXCSR_DE, MXCSR_DE);
fesetenv (FE_NOMASK_ENV);
result |= test_sse_mxcsr_bits ("fesetenv (FE_NOMASK_ENV) DE restoration",
MXCSR_DE, 0);
set_sse_mxcsr_bits (MXCSR_DE, MXCSR_DE);
fesetenv (FE_DFL_ENV);
result |= test_sse_mxcsr_bits ("fesetenv (FE_DFL_ENV) DE restoration",
MXCSR_DE, 0);
return result;
}
static int
do_test (void)
{
if (!CPU_FEATURE_USABLE (SSE2))
FAIL_UNSUPPORTED ("CPU does not support SSE2");
return sse_tests ();
}
#include <support/test-driver.c>
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