diff options
Diffstat (limited to 'sysdeps/x86/fpu/test-fenv-x87.c')
| -rw-r--r-- | sysdeps/x86/fpu/test-fenv-x87.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/sysdeps/x86/fpu/test-fenv-x87.c b/sysdeps/x86/fpu/test-fenv-x87.c new file mode 100644 index 0000000000..2f74471eac --- /dev/null +++ b/sysdeps/x86/fpu/test-fenv-x87.c @@ -0,0 +1,169 @@ +/* Test x86-specific floating-point environment (bug 16068): x87 part. + Copyright (C) 2015 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 + <http://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> |