Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 131 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/i386/fpu/fesetenv.c b/REORG.TODO/sysdeps/i386/fpu/fesetenv.c
new file mode 100644
index 0000000000..a338e5d555
--- /dev/null
+++ b/REORG.TODO/sysdeps/i386/fpu/fesetenv.c
@@ -0,0 +1,131 @@
+/* Install given floating-point environment.
+   Copyright (C) 1997-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   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 <fpu_control.h>
+#include <assert.h>
+#include <unistd.h>
+#include <ldsodefs.h>
+#include <dl-procinfo.h>
+
+
+/* All exceptions, including the x86-specific "denormal operand"
+   exception.  */
+#define FE_ALL_EXCEPT_X86 (FE_ALL_EXCEPT | __FE_DENORM)
+
+
+int
+__fesetenv (const fenv_t *envp)
+{
+  fenv_t temp;
+
+  /* The memory block used by fstenv/fldenv has a size of 28 bytes.  */
+  assert (sizeof (fenv_t) == 28);
+
+  /* Install the environment specified by ENVP.  But there are a few
+     values which we do not want to come from the saved environment.
+     Therefore, we get the current environment and replace the values
+     we want to use from the environment specified by the parameter.  */
+  __asm__ ("fnstenv %0" : "=m" (*&temp));
+
+  if (envp == FE_DFL_ENV)
+    {
+      temp.__control_word |= FE_ALL_EXCEPT_X86;
+      temp.__control_word &= ~FE_TOWARDZERO;
+      temp.__control_word |= _FPU_EXTENDED;
+      temp.__status_word &= ~FE_ALL_EXCEPT_X86;
+    }
+  else if (envp == FE_NOMASK_ENV)
+    {
+      temp.__control_word &= ~(FE_ALL_EXCEPT | FE_TOWARDZERO);
+      /* Keep the "denormal operand" exception masked.  */
+      temp.__control_word |= __FE_DENORM;
+      temp.__control_word |= _FPU_EXTENDED;
+      temp.__status_word &= ~FE_ALL_EXCEPT_X86;
+    }
+  else
+    {
+      temp.__control_word &= ~(FE_ALL_EXCEPT_X86
+			       | FE_TOWARDZERO
+			       | _FPU_EXTENDED);
+      temp.__control_word |= (envp->__control_word
+			      & (FE_ALL_EXCEPT_X86
+				 | FE_TOWARDZERO
+				 | _FPU_EXTENDED));
+      temp.__status_word &= ~FE_ALL_EXCEPT_X86;
+      temp.__status_word |= envp->__status_word & FE_ALL_EXCEPT_X86;
+    }
+  temp.__eip = 0;
+  temp.__cs_selector = 0;
+  temp.__opcode = 0;
+  temp.__data_offset = 0;
+  temp.__data_selector = 0;
+
+  __asm__ ("fldenv %0" : : "m" (temp));
+
+  if (HAS_CPU_FEATURE (SSE))
+    {
+      unsigned int mxcsr;
+      __asm__ ("stmxcsr %0" : "=m" (mxcsr));
+
+      if (envp == FE_DFL_ENV)
+	{
+	  /* Clear SSE exceptions.  */
+	  mxcsr &= ~FE_ALL_EXCEPT_X86;
+	  /* Set mask for SSE MXCSR.  */
+	  mxcsr |= (FE_ALL_EXCEPT_X86 << 7);
+	  /* Set rounding to FE_TONEAREST.  */
+	  mxcsr &= ~0x6000;
+	  mxcsr |= (FE_TONEAREST << 3);
+	  /* Clear the FZ and DAZ bits.  */
+	  mxcsr &= ~0x8040;
+	}
+      else if (envp == FE_NOMASK_ENV)
+	{
+	  /* Clear SSE exceptions.  */
+	  mxcsr &= ~FE_ALL_EXCEPT_X86;
+	  /* Do not mask exceptions.  */
+	  mxcsr &= ~(FE_ALL_EXCEPT << 7);
+	  /* Keep the "denormal operand" exception masked.  */
+	  mxcsr |= (__FE_DENORM << 7);
+	  /* Set rounding to FE_TONEAREST.  */
+	  mxcsr &= ~0x6000;
+	  mxcsr |= (FE_TONEAREST << 3);
+	  /* Clear the FZ and DAZ bits.  */
+	  mxcsr &= ~0x8040;
+	}
+      else
+	mxcsr = envp->__eip;
+
+      __asm__ ("ldmxcsr %0" : : "m" (mxcsr));
+    }
+
+  /* Success.  */
+  return 0;
+}
+
+#include <shlib-compat.h>
+#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
+strong_alias (__fesetenv, __old_fesetenv)
+compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1);
+#endif
+
+libm_hidden_def (__fesetenv)
+libm_hidden_ver (__fesetenv, fesetenv)
+versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2);