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/* Test floating-point environment includes SSE state (bug 16064).
Copyright (C) 2014-2024 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 <stdio.h>
static bool
have_sse2 (void)
{
unsigned int eax, ebx, ecx, edx;
if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
return false;
return (edx & bit_SSE2) != 0;
}
static __attribute__ ((noinline)) int
sse_tests (void)
{
int ret = 0;
fenv_t base_env;
if (fegetenv (&base_env) != 0)
{
puts ("fegetenv (&base_env) failed");
return 1;
}
if (fesetround (FE_UPWARD) != 0)
{
puts ("fesetround (FE_UPWARD) failed");
return 1;
}
if (fesetenv (&base_env) != 0)
{
puts ("fesetenv (&base_env) failed");
return 1;
}
volatile float a = 1.0f, b = FLT_MIN, c;
c = a + b;
if (c != 1.0f)
{
puts ("fesetenv did not restore rounding mode");
ret = 1;
}
if (fesetround (FE_DOWNWARD) != 0)
{
puts ("fesetround (FE_DOWNWARD) failed");
return 1;
}
if (feupdateenv (&base_env) != 0)
{
puts ("feupdateenv (&base_env) failed");
return 1;
}
volatile float d = -FLT_MIN, e;
e = a + d;
if (e != 1.0f)
{
puts ("feupdateenv did not restore rounding mode");
ret = 1;
}
if (fesetround (FE_UPWARD) != 0)
{
puts ("fesetround (FE_UPWARD) failed");
return 1;
}
fenv_t upward_env;
if (feholdexcept (&upward_env) != 0)
{
puts ("feholdexcept (&upward_env) failed");
return 1;
}
if (fesetround (FE_DOWNWARD) != 0)
{
puts ("fesetround (FE_DOWNWARD) failed");
return 1;
}
if (fesetenv (&upward_env) != 0)
{
puts ("fesetenv (&upward_env) failed");
return 1;
}
e = a + d;
if (e != 1.0f)
{
puts ("fesetenv did not restore rounding mode from feholdexcept");
ret = 1;
}
if (fesetround (FE_UPWARD) != 0)
{
puts ("fesetround (FE_UPWARD) failed");
return 1;
}
if (fesetenv (FE_DFL_ENV) != 0)
{
puts ("fesetenv (FE_DFL_ENV) failed");
return 1;
}
c = a + b;
if (c != 1.0f)
{
puts ("fesetenv (FE_DFL_ENV) did not restore rounding mode");
ret = 1;
}
return ret;
}
static int
do_test (void)
{
if (!have_sse2 ())
{
puts ("CPU does not support SSE2, cannot test");
return 0;
}
return sse_tests ();
}
#define TEST_FUNCTION do_test ()
#include <test-skeleton.c>
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