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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/* Install given floating-point environment.
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Copyright (C) 1997-2021 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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<https://www.gnu.org/licenses/>. */
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#include <fenv.h>
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#include <fpu_control.h>
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#include <assert.h>
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#include <unistd.h>
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#include <ldsodefs.h>
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#include <dl-procinfo.h>
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/* All exceptions, including the x86-specific "denormal operand"
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exception. */
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#define FE_ALL_EXCEPT_X86 (FE_ALL_EXCEPT | __FE_DENORM)
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int
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__fesetenv (const fenv_t *envp)
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{
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fenv_t temp;
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/* The memory block used by fstenv/fldenv has a size of 28 bytes. */
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assert (sizeof (fenv_t) == 28);
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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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__asm__ ("fnstenv %0" : "=m" (*&temp));
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if (envp == FE_DFL_ENV)
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{
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temp.__control_word |= FE_ALL_EXCEPT_X86;
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temp.__control_word &= ~FE_TOWARDZERO;
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temp.__control_word |= _FPU_EXTENDED;
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temp.__status_word &= ~FE_ALL_EXCEPT_X86;
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}
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else if (envp == FE_NOMASK_ENV)
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{
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temp.__control_word &= ~(FE_ALL_EXCEPT | FE_TOWARDZERO);
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/* Keep the "denormal operand" exception masked. */
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temp.__control_word |= __FE_DENORM;
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temp.__control_word |= _FPU_EXTENDED;
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temp.__status_word &= ~FE_ALL_EXCEPT_X86;
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}
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else
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{
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temp.__control_word &= ~(FE_ALL_EXCEPT_X86
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| FE_TOWARDZERO
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| _FPU_EXTENDED);
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temp.__control_word |= (envp->__control_word
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& (FE_ALL_EXCEPT_X86
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| FE_TOWARDZERO
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| _FPU_EXTENDED));
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temp.__status_word &= ~FE_ALL_EXCEPT_X86;
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temp.__status_word |= envp->__status_word & FE_ALL_EXCEPT_X86;
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}
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temp.__eip = 0;
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temp.__cs_selector = 0;
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temp.__opcode = 0;
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temp.__data_offset = 0;
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temp.__data_selector = 0;
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__asm__ ("fldenv %0" : : "m" (temp));
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if (CPU_FEATURE_USABLE (SSE))
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{
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unsigned int mxcsr;
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__asm__ ("stmxcsr %0" : "=m" (mxcsr));
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if (envp == FE_DFL_ENV)
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{
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/* Clear SSE exceptions. */
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mxcsr &= ~FE_ALL_EXCEPT_X86;
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/* Set mask for SSE MXCSR. */
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mxcsr |= (FE_ALL_EXCEPT_X86 << 7);
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/* Set rounding to FE_TONEAREST. */
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mxcsr &= ~0x6000;
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mxcsr |= (FE_TONEAREST << 3);
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/* Clear the FZ and DAZ bits. */
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mxcsr &= ~0x8040;
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}
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else if (envp == FE_NOMASK_ENV)
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{
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/* Clear SSE exceptions. */
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mxcsr &= ~FE_ALL_EXCEPT_X86;
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/* Do not mask exceptions. */
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mxcsr &= ~(FE_ALL_EXCEPT << 7);
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/* Keep the "denormal operand" exception masked. */
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mxcsr |= (__FE_DENORM << 7);
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/* Set rounding to FE_TONEAREST. */
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mxcsr &= ~0x6000;
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mxcsr |= (FE_TONEAREST << 3);
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/* Clear the FZ and DAZ bits. */
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mxcsr &= ~0x8040;
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}
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else
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mxcsr = envp->__eip;
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__asm__ ("ldmxcsr %0" : : "m" (mxcsr));
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}
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/* Success. */
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return 0;
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}
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#include <shlib-compat.h>
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#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
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strong_alias (__fesetenv, __old_fesetenv)
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compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1);
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#endif
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libm_hidden_def (__fesetenv)
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libm_hidden_ver (__fesetenv, fesetenv)
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versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2);
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