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, 61 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/alpha/setfpucw.c b/REORG.TODO/sysdeps/unix/sysv/linux/alpha/setfpucw.c
new file mode 100644
index 0000000000..54484f8847
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/sysv/linux/alpha/setfpucw.c
@@ -0,0 +1,61 @@
+/* Set FP exception mask and rounding mode.
+   Copyright (C) 1996-2017 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 <fpu_control.h>
+#include <fenv_libc.h>
+
+
+#define convert_bit(M, F, T)		\
+    ((T) < (F)				\
+     ? ((M) / ((F) / (T))) & (T)	\
+     : ((M) & (F)) * ((T) / (F)))
+
+
+void
+__setfpucw (fpu_control_t fpu_control)
+{
+  unsigned long fpcr, swcr, fc = (int)fpu_control;
+
+  /* ??? If this was a real external interface we'd want to read the current
+     exception state with __ieee_get_fp_control.  But this is an internal
+     function only called at process startup, so there's no point in trying
+     to preserve exceptions that cannot have been raised yet.  Indeed, this
+     entire function is likely to be one big nop unless the user overrides
+     the default __fpu_control variable.  */
+
+  /* Convert the rounding mode from fpu_control.h format.  */
+  const unsigned long conv_rnd
+    = (  (FE_TOWARDZERO << (_FPU_RC_ZERO >> 8))
+       | (FE_DOWNWARD << (_FPU_RC_DOWN >> 8))
+       | (FE_TONEAREST << (_FPU_RC_NEAREST >> 8))
+       | (FE_UPWARD << (_FPU_RC_UP >> 8)));
+
+  fpcr = ((conv_rnd >> ((fc >> 8) & 3)) & 3) << FPCR_ROUND_SHIFT;
+
+  /* Convert the exception mask from fpu_control.h format.  */
+  swcr  = convert_bit (~fc, _FPU_MASK_IM, FE_INVALID >> SWCR_ENABLE_SHIFT);
+  swcr |= convert_bit (~fc, _FPU_MASK_DM, FE_UNDERFLOW >> SWCR_ENABLE_SHIFT);
+  swcr |= convert_bit (~fc, _FPU_MASK_ZM, FE_DIVBYZERO >> SWCR_ENABLE_SHIFT);
+  swcr |= convert_bit (~fc, _FPU_MASK_OM, FE_OVERFLOW >> SWCR_ENABLE_SHIFT);
+  swcr |= convert_bit (~fc, _FPU_MASK_PM, FE_INEXACT >> SWCR_ENABLE_SHIFT);
+
+  /* Install everything.  */
+  __fpu_control = fc;
+  asm volatile ("mt_fpcr %0" : : "f"(fpcr));
+  __ieee_set_fp_control(swcr);
+}