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, 93 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/aarch64/fpu/fraiseexcpt.c b/REORG.TODO/sysdeps/aarch64/fpu/fraiseexcpt.c
new file mode 100644
index 0000000000..557b061ca7
--- /dev/null
+++ b/REORG.TODO/sysdeps/aarch64/fpu/fraiseexcpt.c
@@ -0,0 +1,93 @@
+/* Copyright (C) 1997-2017 Free Software Foundation, Inc.
+
+   This file is part of the GNU C Library.
+
+   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 <float.h>
+
+int
+__feraiseexcept (int excepts)
+{
+  int fpsr;
+  const float fp_zero = 0.0;
+  const float fp_one = 1.0;
+  const float fp_max = FLT_MAX;
+  const float fp_min = FLT_MIN;
+  const float fp_1e32 = 1.0e32f;
+  const float fp_two = 2.0;
+  const float fp_three = 3.0;
+
+  /* Raise exceptions represented by EXCEPTS.  But we must raise only
+     one signal at a time.  It is important that if the OVERFLOW or
+     UNDERFLOW exception and the inexact exception are given at the
+     same time, the OVERFLOW or UNDERFLOW exception precedes the
+     INEXACT exception.
+
+     After each exception we read from the FPSR, to force the
+     exception to be raised immediately.  */
+
+  if (FE_INVALID & excepts)
+    __asm__ __volatile__ (
+			  "ldr	s0, %1\n\t"
+			  "fdiv	s0, s0, s0\n\t"
+			  "mrs	%0, fpsr" : "=r" (fpsr)
+			  : "m" (fp_zero)
+			  : "d0");
+
+  if (FE_DIVBYZERO & excepts)
+    __asm__ __volatile__ (
+			  "ldr	s0, %1\n\t"
+			  "ldr	s1, %2\n\t"
+			  "fdiv	s0, s0, s1\n\t"
+			  "mrs	%0, fpsr" : "=r" (fpsr)
+			  : "m" (fp_one), "m" (fp_zero)
+			  : "d0", "d1");
+
+  if (FE_OVERFLOW & excepts)
+    /* There's no way to raise overflow without also raising inexact.  */
+    __asm__ __volatile__ (
+			  "ldr	s0, %1\n\t"
+			  "ldr	s1, %2\n\t"
+			  "fadd s0, s0, s1\n\t"
+			  "mrs	%0, fpsr" : "=r" (fpsr)
+			  : "m" (fp_max), "m" (fp_1e32)
+			  : "d0", "d1");
+
+  if (FE_UNDERFLOW & excepts)
+    __asm__ __volatile__ (
+			  "ldr	s0, %1\n\t"
+			  "ldr	s1, %2\n\t"
+			  "fdiv s0, s0, s1\n\t"
+			  "mrs	%0, fpsr" : "=r" (fpsr)
+			  : "m" (fp_min), "m" (fp_three)
+			  : "d0", "d1");
+
+  if (FE_INEXACT & excepts)
+    __asm__ __volatile__ (
+			  "ldr	s0, %1\n\t"
+			  "ldr	s1, %2\n\t"
+			  "fdiv s0, s0, s1\n\t"
+			  "mrs	%0, fpsr" : "=r" (fpsr)
+			  : "m" (fp_two), "m" (fp_three)
+			  : "d0", "d1");
+
+  return 0;
+}
+libm_hidden_def (__feraiseexcept)
+weak_alias (__feraiseexcept, feraiseexcept)
+libm_hidden_weak (feraiseexcept)