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0b9af583a5
The i386 and x86_64 versions of fesetenv, when called with FE_DFL_ENV or FE_NOMASK_ENV as argument, do not clear SSE exceptions raised in MXCSR. These arguments should, like other fenv_t values, represent the whole of the floating-point state, so such exceptions should be cleared; this patch adds the required clearing. (Discovered while working on bug 16068.) Tested for x86_64 and x86. [BZ #19181] * sysdeps/i386/fpu/fesetenv.c (__fesetenv): Clear already-raised SSE exceptions when argument is FE_DFL_ENV or FE_NOMASK_ENV. * sysdeps/x86_64/fpu/fesetenv.c (__fesetenv): Likewise. * math/test-fenv-clear-main.c: New file. * math/test-fenv-clear.c: Likewise. * math/Makefile (tests): Add test-fenv-clear. * sysdeps/x86/fpu/test-fenv-clear-sse.c: New file. * sysdeps/x86/fpu/Makefile [$(subdir) = math] (tests): Add test-fenv-clear-sse. [$(subdir) = math] (CFLAGS-test-fenv-clear-sse.c): New variable.
92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/* Test fesetenv (FE_DFL_ENV) and fesetenv (FE_NOMASK_ENV) clear
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exceptions (bug 19181).
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Copyright (C) 2015 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 <stdio.h>
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volatile float fa = 1.0f, fb = 0.0f, fc = FLT_MAX, fr;
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volatile long double lda = 1.0L, ldb = 0.0L, ldc = LDBL_MAX, ldr;
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static void
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raise_exceptions (void)
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{
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/* Raise exceptions both with feraiseexcept and arithmetic to allow
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for case of multiple floating-point units with separate
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exceptions state. */
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feraiseexcept (FE_ALL_EXCEPT);
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fr = fb / fb;
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fr = fa / fb;
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fr = fc * fc;
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fr = fa / fc / fc;
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ldr = ldb / ldb;
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ldr = lda / ldb;
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ldr = ldc * ldc;
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ldr = lda / ldc / ldc;
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}
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static __attribute__ ((noinline)) int
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run_tests (void)
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{
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int result = 0;
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raise_exceptions ();
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if (fesetenv (FE_DFL_ENV) == 0)
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{
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puts ("PASS: fesetenv (FE_DFL_ENV)");
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if (fetestexcept (FE_ALL_EXCEPT) == 0)
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puts ("PASS: fesetenv (FE_DFL_ENV) clearing exceptions");
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else
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{
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puts ("FAIL: fesetenv (FE_DFL_ENV) clearing exceptions");
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result = 1;
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}
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}
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else
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{
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puts ("FAIL: fesetenv (FE_DFL_ENV)");
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result = 1;
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}
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#ifdef FE_NOMASK_ENV
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raise_exceptions ();
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if (fesetenv (FE_NOMASK_ENV) == 0)
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{
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if (fetestexcept (FE_ALL_EXCEPT) == 0)
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puts ("PASS: fesetenv (FE_NOMASK_ENV) clearing exceptions");
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else
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{
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puts ("FAIL: fesetenv (FE_NOMASK_ENV) clearing exceptions");
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result = 1;
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}
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}
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else
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puts ("fesetenv (FE_NOMASK_ENV) failed, cannot test");
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#endif
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return result;
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}
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static int
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do_test (void)
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{
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CHECK_CAN_TEST;
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return run_tests ();
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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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