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fae1aa8d22
The constraints in the inline assembly in feholdexcept and fesetenv are incorrect. The assembly modifies the buffer pointer, but doesn't express that in the constraints. The simple fix is to remove the modification of the buffer pointer which is no longer required by the existing code, and adjust the one constraint that did express the modification of bufptr. The change fixes test-fenv when glibc is compiled with recent gcc.
54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/* Store current floating-point environment and clear exceptions.
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Copyright (C) 2000-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by David Huggins-Daines <dhd@debian.org>, 2000
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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 <string.h>
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int
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__feholdexcept (fenv_t *envp)
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{
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union { unsigned long long buf[4]; fenv_t env; } clear;
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unsigned long long *bufptr;
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/* Store the environment. */
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bufptr = clear.buf;
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__asm__ (
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"fstd %%fr0,0(%1)\n"
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: "=m" (clear) : "r" (bufptr) : "%r0");
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memcpy (envp, &clear.env, sizeof (fenv_t));
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/* Clear exception queues */
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memset (clear.env.__exception, 0, sizeof (clear.env.__exception));
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/* And set all exceptions to non-stop. */
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clear.env.__status_word &= ~FE_ALL_EXCEPT;
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/* Now clear all flags */
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clear.env.__status_word &= ~(FE_ALL_EXCEPT << 27);
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/* Load the new environment. Note: fr0 must load last to enable T-bit. */
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__asm__ (
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"fldd 0(%0),%%fr0\n"
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: : "r" (bufptr), "m" (clear) : "%r0");
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return 0;
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}
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libm_hidden_def (__feholdexcept)
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weak_alias (__feholdexcept, feholdexcept)
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libm_hidden_weak (feholdexcept)
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