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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.
66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/* Install given floating-point environment.
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Copyright (C) 1997-2015 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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Based on the m68k version by
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Andreas Schwab <schwab@suse.de>
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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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int
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__fesetenv (const fenv_t *envp)
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{
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union { unsigned long long buf[4]; fenv_t env; } temp;
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unsigned long long *bufptr;
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/* Install the environment specified by ENVP. But there are a few
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values which we do not want to come from the saved environment.
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Therefore, we get the current environment and replace the values
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we want to use from the environment specified by the parameter. */
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bufptr = temp.buf;
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__asm__ (
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"fstd %%fr0,0(%1)\n"
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: "=m" (temp) : "r" (bufptr) : "%r0");
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temp.env.__status_word &= ~(FE_ALL_EXCEPT
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| (FE_ALL_EXCEPT << 27)
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| FE_DOWNWARD);
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if (envp == FE_DFL_ENV)
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temp.env.__status_word = 0;
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else if (envp == FE_NOMASK_ENV)
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temp.env.__status_word |= FE_ALL_EXCEPT;
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else
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temp.env.__status_word |= (envp->__status_word
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& (FE_ALL_EXCEPT
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| FE_DOWNWARD
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| (FE_ALL_EXCEPT << 27)));
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/* Load the new environment. We use bufptr again since the
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initial asm has modified the value of the register and here
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we take advantage of that to load in reverse order so fr0
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is loaded last and T-Bit is enabled. */
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__asm__ (
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"fldd 0(%1),%%fr0\n"
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: : "m" (temp), "r" (bufptr) : "%r0" );
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/* Success. */
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return 0;
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}
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libm_hidden_def (__fesetenv)
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weak_alias (__fesetenv, fesetenv)
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libm_hidden_weak (fesetenv)
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