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, 437 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/tile/wordcopy.c b/REORG.TODO/sysdeps/tile/wordcopy.c
new file mode 100644
index 0000000000..2f93e5a5d1
--- /dev/null
+++ b/REORG.TODO/sysdeps/tile/wordcopy.c
@@ -0,0 +1,437 @@
+/* wordcopy.c -- subroutines for memory copy functions.  Tile version.
+   Copyright (C) 1991-2017 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/>.  */
+
+/* To optimize for tile, we make the following changes from the
+   default glibc version:
+   - Use the double align instruction instead of the MERGE macro.
+   - Since we don't have offset addressing mode, make sure the loads /
+     stores in the inner loop always have indices of 0.
+   - Use post-increment addresses in the inner loops, which yields
+     better scheduling.  */
+
+/* BE VERY CAREFUL IF YOU CHANGE THIS CODE...!  */
+
+#include <stddef.h>
+#include <memcopy.h>
+
+/* Provide the appropriate dblalign builtin to shift two registers
+   based on the alignment of a pointer held in a third register.  */
+#ifdef __tilegx__
+#define DBLALIGN __insn_dblalign
+#else
+#define DBLALIGN __insn_dword_align
+#endif
+
+/* _wordcopy_fwd_aligned -- Copy block beginning at SRCP to
+   block beginning at DSTP with LEN `op_t' words (not LEN bytes!).
+   Both SRCP and DSTP should be aligned for memory operations on `op_t's.  */
+
+void
+_wordcopy_fwd_aligned (long int dstp, long int srcp, size_t len)
+{
+  op_t a0, a1;
+
+  switch (len % 8)
+    {
+    case 2:
+      a0 = ((op_t *) srcp)[0];
+      srcp += OPSIZ;
+      len += 6;
+      goto do1;
+    case 3:
+      a1 = ((op_t *) srcp)[0];
+      srcp += OPSIZ;
+      len += 5;
+      goto do2;
+    case 4:
+      a0 = ((op_t *) srcp)[0];
+      srcp += OPSIZ;
+      len += 4;
+      goto do3;
+    case 5:
+      a1 = ((op_t *) srcp)[0];
+      srcp += OPSIZ;
+      len += 3;
+      goto do4;
+    case 6:
+      a0 = ((op_t *) srcp)[0];
+      srcp += OPSIZ;
+      len += 2;
+      goto do5;
+    case 7:
+      a1 = ((op_t *) srcp)[0];
+      srcp += OPSIZ;
+      len += 1;
+      goto do6;
+
+    case 0:
+      if (OP_T_THRES <= 3 * OPSIZ && len == 0)
+	return;
+      a0 = ((op_t *) srcp)[0];
+      srcp += OPSIZ;
+      goto do7;
+    case 1:
+      a1 = ((op_t *) srcp)[0];
+      srcp += OPSIZ;
+      len -= 1;
+      if (OP_T_THRES <= 3 * OPSIZ && len == 0)
+	goto do0;
+      goto do8;			/* No-op.  */
+    }
+
+  do
+    {
+    do8:
+      a0 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a1;
+      srcp += OPSIZ;
+      dstp += OPSIZ;
+    do7:
+      a1 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a0;
+      srcp += OPSIZ;
+      dstp += OPSIZ;
+    do6:
+      a0 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a1;
+      srcp += OPSIZ;
+      dstp += OPSIZ;
+    do5:
+      a1 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a0;
+      srcp += OPSIZ;
+      dstp += OPSIZ;
+    do4:
+      a0 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a1;
+      srcp += OPSIZ;
+      dstp += OPSIZ;
+    do3:
+      a1 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a0;
+      srcp += OPSIZ;
+      dstp += OPSIZ;
+    do2:
+      a0 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a1;
+      srcp += OPSIZ;
+      dstp += OPSIZ;
+    do1:
+      a1 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a0;
+      srcp += OPSIZ;
+      dstp += OPSIZ;
+
+      len -= 8;
+    }
+  while (len != 0);
+
+  /* This is the right position for do0.  Please don't move
+     it into the loop.  */
+ do0:
+  ((op_t *) dstp)[0] = a1;
+}
+
+/* _wordcopy_fwd_dest_aligned -- Copy block beginning at SRCP to
+   block beginning at DSTP with LEN `op_t' words (not LEN bytes!).
+   DSTP should be aligned for memory operations on `op_t's, but SRCP must
+   *not* be aligned.  */
+
+void
+_wordcopy_fwd_dest_aligned (long int dstp, long int srcp, size_t len)
+{
+  void * srci;
+  op_t a0, a1, a2, a3;
+
+  /* Save the initial source pointer so we know the number of bytes to
+     shift for merging two unaligned results.  */
+  srci = (void *) srcp;
+
+  /* Make SRCP aligned by rounding it down to the beginning of the `op_t'
+     it points in the middle of.  */
+  srcp &= -OPSIZ;
+
+  switch (len % 4)
+    {
+    case 2:
+      a1 = ((op_t *) srcp)[0];
+      a2 = ((op_t *) srcp)[1];
+      len += 2;
+      srcp += 2 * OPSIZ;
+      goto do1;
+    case 3:
+      a0 = ((op_t *) srcp)[0];
+      a1 = ((op_t *) srcp)[1];
+      len += 1;
+      srcp += 2 * OPSIZ;
+      goto do2;
+    case 0:
+      if (OP_T_THRES <= 3 * OPSIZ && len == 0)
+	return;
+      a3 = ((op_t *) srcp)[0];
+      a0 = ((op_t *) srcp)[1];
+      len += 0;
+      srcp += 2 * OPSIZ;
+      goto do3;
+    case 1:
+      a2 = ((op_t *) srcp)[0];
+      a3 = ((op_t *) srcp)[1];
+      srcp += 2 * OPSIZ;
+      len -= 1;
+      if (OP_T_THRES <= 3 * OPSIZ && len == 0)
+	goto do0;
+      goto do4;			/* No-op.  */
+    }
+
+  do
+    {
+    do4:
+      a0 = ((op_t *) srcp)[0];
+      a2 = DBLALIGN (a2, a3, srci);
+      ((op_t *) dstp)[0] = a2;
+      srcp += OPSIZ;
+      dstp += OPSIZ;
+    do3:
+      a1 = ((op_t *) srcp)[0];
+      a3 = DBLALIGN (a3, a0, srci);
+      ((op_t *) dstp)[0] = a3;
+      srcp += OPSIZ;
+      dstp += OPSIZ;
+    do2:
+      a2 = ((op_t *) srcp)[0];
+      a0 = DBLALIGN (a0, a1, srci);
+      ((op_t *) dstp)[0] = a0;
+      srcp += OPSIZ;
+      dstp += OPSIZ;
+    do1:
+      a3 = ((op_t *) srcp)[0];
+      a1 = DBLALIGN (a1, a2, srci);
+      ((op_t *) dstp)[0] = a1;
+      srcp += OPSIZ;
+      dstp += OPSIZ;
+      len -= 4;
+    }
+  while (len != 0);
+
+  /* This is the right position for do0.  Please don't move
+     it into the loop.  */
+ do0:
+  ((op_t *) dstp)[0] = DBLALIGN (a2, a3, srci);
+}
+
+/* _wordcopy_bwd_aligned -- Copy block finishing right before
+   SRCP to block finishing right before DSTP with LEN `op_t' words
+   (not LEN bytes!).  Both SRCP and DSTP should be aligned for memory
+   operations on `op_t's.  */
+
+void
+_wordcopy_bwd_aligned (long int dstp, long int srcp, size_t len)
+{
+  op_t a0, a1;
+  long int srcp1;
+
+  srcp1 = srcp - 1 * OPSIZ;
+  srcp -= 2 * OPSIZ;
+  dstp -= 1 * OPSIZ;
+
+  switch (len % 8)
+    {
+    case 2:
+      a0 = ((op_t *) srcp1)[0];
+      len += 6;
+      goto do1;
+    case 3:
+      a1 = ((op_t *) srcp1)[0];
+      len += 5;
+      goto do2;
+    case 4:
+      a0 = ((op_t *) srcp1)[0];
+      len += 4;
+      goto do3;
+    case 5:
+      a1 = ((op_t *) srcp1)[0];
+      len += 3;
+      goto do4;
+    case 6:
+      a0 = ((op_t *) srcp1)[0];
+      len += 2;
+      goto do5;
+    case 7:
+      a1 = ((op_t *) srcp1)[0];
+      len += 1;
+      goto do6;
+
+    case 0:
+      if (OP_T_THRES <= 3 * OPSIZ && len == 0)
+	return;
+      a0 = ((op_t *) srcp1)[0];
+      goto do7;
+    case 1:
+      a1 = ((op_t *) srcp1)[0];
+      len -= 1;
+      if (OP_T_THRES <= 3 * OPSIZ && len == 0)
+	goto do0;
+      goto do8;			/* No-op.  */
+    }
+
+  do
+    {
+    do8:
+      a0 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a1;
+      srcp -= OPSIZ;
+      dstp -= OPSIZ;
+    do7:
+      a1 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a0;
+      srcp -= OPSIZ;
+      dstp -= OPSIZ;
+    do6:
+      a0 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a1;
+      srcp -= OPSIZ;
+      dstp -= OPSIZ;
+    do5:
+      a1 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a0;
+      srcp -= OPSIZ;
+      dstp -= OPSIZ;
+    do4:
+      a0 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a1;
+      srcp -= OPSIZ;
+      dstp -= OPSIZ;
+    do3:
+      a1 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a0;
+      srcp -= OPSIZ;
+      dstp -= OPSIZ;
+    do2:
+      a0 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a1;
+      srcp -= OPSIZ;
+      dstp -= OPSIZ;
+    do1:
+      a1 = ((op_t *) srcp)[0];
+      ((op_t *) dstp)[0] = a0;
+      srcp -= OPSIZ;
+      dstp -= OPSIZ;
+
+      len -= 8;
+    }
+  while (len != 0);
+
+  /* This is the right position for do0.  Please don't move
+     it into the loop.  */
+ do0:
+  ((op_t *) dstp)[0] = a1;
+}
+
+/* _wordcopy_bwd_dest_aligned -- Copy block finishing right
+   before SRCP to block finishing right before DSTP with LEN `op_t'
+   words (not LEN bytes!).  DSTP should be aligned for memory
+   operations on `op_t', but SRCP must *not* be aligned.  */
+
+void
+_wordcopy_bwd_dest_aligned (long int dstp, long int srcp, size_t len)
+{
+  void * srci;
+  op_t a0, a1, a2, a3;
+  op_t b0, b1, b2, b3;
+
+  /* Save the initial source pointer so we know the number of bytes to
+     shift for merging two unaligned results.  */
+  srci = (void *) srcp;
+
+  /* Make SRCP aligned by rounding it down to the beginning of the op_t
+     it points in the middle of.  */
+  srcp &= -OPSIZ;
+  srcp += OPSIZ;
+
+  switch (len % 4)
+    {
+    case 2:
+      srcp -= 3 * OPSIZ;
+      dstp -= 1 * OPSIZ;
+      b2 = ((op_t *) srcp)[2];
+      b1 = a1 = ((op_t *) srcp)[1];
+      len += 2;
+      goto do1;
+    case 3:
+      srcp -= 3 * OPSIZ;
+      dstp -= 1 * OPSIZ;
+      b3 = ((op_t *) srcp)[2];
+      b2 = a2 = ((op_t *) srcp)[1];
+      len += 1;
+      goto do2;
+    case 0:
+      if (OP_T_THRES <= 3 * OPSIZ && len == 0)
+	return;
+      srcp -= 3 * OPSIZ;
+      dstp -= 1 * OPSIZ;
+      b0 = ((op_t *) srcp)[2];
+      b3 = a3 = ((op_t *) srcp)[1];
+      goto do3;
+    case 1:
+      srcp -= 3 * OPSIZ;
+      dstp -= 1 * OPSIZ;
+      b1 = ((op_t *) srcp)[2];
+      b0 = a0 = ((op_t *) srcp)[1];
+      len -= 1;
+      if (OP_T_THRES <= 3 * OPSIZ && len == 0)
+	goto do0;
+      goto do4;			/* No-op.  */
+    }
+
+  do
+    {
+    do4:
+      b3 = a3 = ((op_t *) srcp)[0];
+      a0 = DBLALIGN (a0, b1, srci);
+      ((op_t *) dstp)[0] = a0;
+      srcp -= OPSIZ;
+      dstp -= OPSIZ;
+    do3:
+      b2 = a2 = ((op_t *) srcp)[0];
+      a3 = DBLALIGN (a3, b0, srci);
+      ((op_t *) dstp)[0] = a3;
+      srcp -= OPSIZ;
+      dstp -= OPSIZ;
+    do2:
+      b1 = a1 = ((op_t *) srcp)[0];
+      a2 = DBLALIGN (a2, b3, srci);
+      ((op_t *) dstp)[0] = a2;
+      srcp -= OPSIZ;
+      dstp -= OPSIZ;
+    do1:
+      b0 = a0 = ((op_t *) srcp)[0];
+      a1 = DBLALIGN (a1, b2, srci);
+      ((op_t *) dstp)[0] = a1;
+      srcp -= OPSIZ;
+      dstp -= OPSIZ;
+
+      len -= 4;
+    }
+  while (len != 0);
+
+  /* This is the right position for do0.  Please don't move
+     it into the loop.  */
+ do0:
+  a0 = DBLALIGN (a0, b1, srci);
+  ((op_t *) dstp)[0] = a0;
+}