Remove tilegx port.

Since tile support has been removed from the Linux kernel for 4.17,
this patch removes the (unmaintained) port to tilegx from glibc (the
tilepro support having been previously removed).  This reflects the
general principle that a glibc port needs upstream support for the
architecture in all the components it build-depends on (so binutils,
GCC and the Linux kernel, for the normal case of a port supporting the
Linux kernel but no other OS), in order to be maintainable.

Apart from removal of sysdeps/tile and sysdeps/unix/sysv/linux/tile,
there are updates to various comments referencing tile for which
removal of those references seemed appropriate.  The configuration is
removed from README and from build-many-glibcs.py.  contrib.texi keeps
mention of removed contributions, but I updated Chris Metcalf's entry
to reflect that he also contributed the non-removed support for the
generic Linux kernel syscall interface.
__ASSUME_FADVISE64_64_NO_ALIGN support is removed, as it was only used
by tile.

	* sysdeps/tile: Remove.
	* sysdeps/unix/sysv/linux/tile: Likewise.
	* README (tilegx-*-linux-gnu): Remove from list of supported
	configurations.
	* manual/contrib.texi (Contributors): Mention Chris Metcalf's
	contribution of support for generic Linux kernel syscall
	interface.
	* scripts/build-many-glibcs.py (Context.add_all_configs): Remove
	tilegx configurations.
	(Config.install_linux_headers): Do not handle tile.
	* sysdeps/unix/sysv/linux/aarch64/ldsodefs.h: Do not mention Tile
	in comment.
	* sysdeps/unix/sysv/linux/nios2/Makefile: Likewise.
	* sysdeps/unix/sysv/linux/posix_fadvise.c: Likewise.
	[__ASSUME_FADVISE64_64_NO_ALIGN] (__ALIGNMENT_ARG): Remove
	conditional undefine and redefine.
	* sysdeps/unix/sysv/linux/posix_fadvise64.c: Do not mention Tile
	in comment.
	[__ASSUME_FADVISE64_64_NO_ALIGN] (__ALIGNMENT_ARG): Remove
	conditional undefine and redefine.

1 files changed, 0 insertions, 349 deletions

diff --git a/sysdeps/tile/memcmp.c b/sysdeps/tile/memcmp.c
deleted file mode 100644
index b7cf00af4c..0000000000
--- a/sysdeps/tile/memcmp.c
+++ /dev/null
@@ -1,349 +0,0 @@
-/* Copyright (C) 1991-2018 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/>.  */
-
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-
-#if defined HAVE_STRING_H || defined _LIBC
-# include <string.h>
-#endif
-
-#undef memcmp
-
-#ifndef MEMCMP
-# define MEMCMP memcmp
-#endif
-
-#ifdef _LIBC
-
-# include <memcopy.h>
-# include <endian.h>
-
-# if __BYTE_ORDER == __BIG_ENDIAN
-#  define WORDS_BIGENDIAN
-# endif
-
-#else	/* Not in the GNU C library.  */
-
-# include <sys/types.h>
-
-/* Type to use for aligned memory operations.
-   This should normally be the biggest type supported by a single load
-   and store.  Must be an unsigned type.  */
-# define op_t	unsigned long int
-# define OPSIZ	(sizeof(op_t))
-
-/* Threshold value for when to enter the unrolled loops.  */
-# define OP_T_THRES	16
-
-/* Type to use for unaligned operations.  */
-typedef unsigned char byte;
-
-#endif	/* In the GNU C library.  */
-
-/* Provide the appropriate builtins to shift two registers based on
-   the alignment of a pointer held in a third register, and to reverse
-   the bytes in a word.  */
-#define DBLALIGN __insn_dblalign
-#define REVBYTES __insn_revbytes
-
-#ifdef WORDS_BIGENDIAN
-# define CMP_LT_OR_GT(a, b) ((a) > (b) ? 1 : -1)
-#else
-# define CMP_LT_OR_GT(a, b) (REVBYTES(a) > REVBYTES(b) ? 1 : -1)
-#endif
-
-/* BE VERY CAREFUL IF YOU CHANGE THIS CODE!  */
-
-/* The strategy of this memcmp is:
-
-   1. Compare bytes until one of the block pointers is aligned.
-
-   2. Compare using memcmp_common_alignment or
-      memcmp_not_common_alignment, regarding the alignment of the other
-      block after the initial byte operations.  The maximum number of
-      full words (of type op_t) are compared in this way.
-
-   3. Compare the few remaining bytes.  */
-
-static int memcmp_common_alignment (long, long, size_t) __THROW;
-
-/* memcmp_common_alignment -- Compare blocks at SRCP1 and SRCP2 with LEN `op_t'
-   objects (not LEN bytes!).  Both SRCP1 and SRCP2 should be aligned for
-   memory operations on `op_t's.  */
-static int
-memcmp_common_alignment (long int srcp1, long int srcp2, size_t len)
-{
-  op_t a0, a1;
-  op_t b0, b1;
-
-  switch (len % 4)
-    {
-    default: /* Avoid warning about uninitialized local variables.  */
-    case 2:
-      a0 = ((op_t *) srcp1)[0];
-      b0 = ((op_t *) srcp2)[0];
-      srcp1 += OPSIZ;
-      srcp2 += OPSIZ;
-      len += 2;
-      goto do1;
-    case 3:
-      a1 = ((op_t *) srcp1)[0];
-      b1 = ((op_t *) srcp2)[0];
-      srcp1 += OPSIZ;
-      srcp2 += OPSIZ;
-      len += 1;
-      goto do2;
-    case 0:
-      if (OP_T_THRES <= 3 * OPSIZ && len == 0)
-	return 0;
-      a0 = ((op_t *) srcp1)[0];
-      b0 = ((op_t *) srcp2)[0];
-      srcp1 += OPSIZ;
-      srcp2 += OPSIZ;
-      goto do3;
-    case 1:
-      a1 = ((op_t *) srcp1)[0];
-      b1 = ((op_t *) srcp2)[0];
-      srcp1 += OPSIZ;
-      srcp2 += OPSIZ;
-      len -= 1;
-      if (OP_T_THRES <= 3 * OPSIZ && len == 0)
-	goto do0;
-      /* Fall through.  */
-    }
-
-  do
-    {
-      a0 = ((op_t *) srcp1)[0];
-      b0 = ((op_t *) srcp2)[0];
-      srcp1 += OPSIZ;
-      srcp2 += OPSIZ;
-      if (__glibc_likely (a1 != b1))
-	return CMP_LT_OR_GT (a1, b1);
-
-    do3:
-      a1 = ((op_t *) srcp1)[0];
-      b1 = ((op_t *) srcp2)[0];
-      srcp1 += OPSIZ;
-      srcp2 += OPSIZ;
-      if (__glibc_likely (a0 != b0))
-	return CMP_LT_OR_GT (a0, b0);
-
-    do2:
-      a0 = ((op_t *) srcp1)[0];
-      b0 = ((op_t *) srcp2)[0];
-      srcp1 += OPSIZ;
-      srcp2 += OPSIZ;
-      if (__glibc_likely (a1 != b1))
-	return CMP_LT_OR_GT (a1, b1);
-
-    do1:
-      a1 = ((op_t *) srcp1)[0];
-      b1 = ((op_t *) srcp2)[0];
-      srcp1 += OPSIZ;
-      srcp2 += OPSIZ;
-      if (__glibc_likely (a0 != b0))
-	return CMP_LT_OR_GT (a0, b0);
-
-      len -= 4;
-    }
-  while (len != 0);
-
-  /* This is the right position for do0.  Please don't move
-     it into the loop.  */
- do0:
-  if (__glibc_likely (a1 != b1))
-    return CMP_LT_OR_GT (a1, b1);
-  return 0;
-}
-
-static int memcmp_not_common_alignment (long, long, size_t) __THROW;
-
-/* memcmp_not_common_alignment -- Compare blocks at SRCP1 and SRCP2 with LEN
-   `op_t' objects (not LEN bytes!).  SRCP2 should be aligned for memory
-   operations on `op_t', but SRCP1 *should be unaligned*.  */
-static int
-memcmp_not_common_alignment (long int srcp1, long int srcp2, size_t len)
-{
-  void * srcp1i;
-  op_t a0, a1, a2, a3;
-  op_t b0, b1, b2, b3;
-  op_t x;
-
-  /* Calculate how to shift a word read at the memory operation
-     aligned srcp1 to make it aligned for comparison.  */
-
-  srcp1i = (void *) srcp1;
-
-  /* Make SRCP1 aligned by rounding it down to the beginning of the `op_t'
-     it points in the middle of.  */
-  srcp1 &= -OPSIZ;
-
-  switch (len % 4)
-    {
-    default: /* Avoid warning about uninitialized local variables.  */
-    case 2:
-      a1 = ((op_t *) srcp1)[0];
-      a2 = ((op_t *) srcp1)[1];
-      b2 = ((op_t *) srcp2)[0];
-      srcp1 += 2 * OPSIZ;
-      srcp2 += 1 * OPSIZ;
-      len += 2;
-      goto do1;
-    case 3:
-      a0 = ((op_t *) srcp1)[0];
-      a1 = ((op_t *) srcp1)[1];
-      b1 = ((op_t *) srcp2)[0];
-      srcp1 += 2 * OPSIZ;
-      srcp2 += 1 * OPSIZ;
-      len += 1;
-      goto do2;
-    case 0:
-      if (OP_T_THRES <= 3 * OPSIZ && len == 0)
-	return 0;
-      a3 = ((op_t *) srcp1)[0];
-      a0 = ((op_t *) srcp1)[1];
-      b0 = ((op_t *) srcp2)[0];
-      srcp1 += 2 * OPSIZ;
-      srcp2 += 1 * OPSIZ;
-      goto do3;
-    case 1:
-      a2 = ((op_t *) srcp1)[0];
-      a3 = ((op_t *) srcp1)[1];
-      b3 = ((op_t *) srcp2)[0];
-      srcp1 += 2 * OPSIZ;
-      srcp2 += 1 * OPSIZ;
-      len -= 1;
-      if (OP_T_THRES <= 3 * OPSIZ && len == 0)
-	goto do0;
-      /* Fall through.  */
-    }
-
-  do
-    {
-      a0 = ((op_t *) srcp1)[0];
-      b0 = ((op_t *) srcp2)[0];
-      x = DBLALIGN (a2, a3, srcp1i);
-      srcp1 += OPSIZ;
-      srcp2 += OPSIZ;
-      if (__glibc_likely (x != b3))
-	return CMP_LT_OR_GT (x, b3);
-
-    do3:
-      a1 = ((op_t *) srcp1)[0];
-      b1 = ((op_t *) srcp2)[0];
-      x = DBLALIGN (a3, a0, srcp1i);
-      srcp1 += OPSIZ;
-      srcp2 += OPSIZ;
-      if (__glibc_likely (x != b0))
-	return CMP_LT_OR_GT (x, b0);
-
-    do2:
-      a2 = ((op_t *) srcp1)[0];
-      b2 = ((op_t *) srcp2)[0];
-      x = DBLALIGN (a0, a1, srcp1i);
-      srcp1 += OPSIZ;
-      srcp2 += OPSIZ;
-      if (__glibc_likely (x != b1))
-	return CMP_LT_OR_GT (x, b1);
-
-    do1:
-      a3 = ((op_t *) srcp1)[0];
-      b3 = ((op_t *) srcp2)[0];
-      x = DBLALIGN (a1, a2, srcp1i);
-      srcp1 += OPSIZ;
-      srcp2 += OPSIZ;
-      if (__glibc_likely (x != b2))
-	return CMP_LT_OR_GT (x, b2);
-
-      len -= 4;
-    }
-  while (len != 0);
-
-  /* This is the right position for do0.  Please don't move
-     it into the loop.  */
- do0:
-  x = DBLALIGN (a2, a3, srcp1i);
-  if (__glibc_likely (x != b3))
-    return CMP_LT_OR_GT (x, b3);
-  return 0;
-}
-
-int
-MEMCMP (const void *s1, const void *s2, size_t len)
-{
-  op_t a0;
-  op_t b0;
-  long int srcp1 = (long int) s1;
-  long int srcp2 = (long int) s2;
-  int res;
-
-  if (len >= OP_T_THRES)
-    {
-      /* There are at least some bytes to compare.  No need to test
-	 for LEN == 0 in this alignment loop.  */
-      while (srcp2 % OPSIZ != 0)
-	{
-	  a0 = ((byte *) srcp1)[0];
-	  b0 = ((byte *) srcp2)[0];
-	  srcp1 += 1;
-	  srcp2 += 1;
-	  res = a0 - b0;
-	  if (__glibc_likely (res != 0))
-	    return res;
-	  len -= 1;
-	}
-
-      /* SRCP2 is now aligned for memory operations on `op_t'.
-	 SRCP1 alignment determines if we can do a simple,
-	 aligned compare or need to shuffle bits.  */
-
-      if (srcp1 % OPSIZ == 0)
-	res = memcmp_common_alignment (srcp1, srcp2, len / OPSIZ);
-      else
-	res = memcmp_not_common_alignment (srcp1, srcp2, len / OPSIZ);
-      if (res != 0)
-	return res;
-
-      /* Number of bytes remaining in the interval [0..OPSIZ-1].  */
-      srcp1 += len & -OPSIZ;
-      srcp2 += len & -OPSIZ;
-      len %= OPSIZ;
-    }
-
-  /* There are just a few bytes to compare.  Use byte memory operations.  */
-  while (len != 0)
-    {
-      a0 = ((byte *) srcp1)[0];
-      b0 = ((byte *) srcp2)[0];
-      srcp1 += 1;
-      srcp2 += 1;
-      res = a0 - b0;
-      if (__glibc_likely (res != 0))
-	return res;
-      len -= 1;
-    }
-
-  return 0;
-}
-libc_hidden_builtin_def(memcmp)
-#ifdef weak_alias
-# undef bcmp
-weak_alias (memcmp, bcmp)
-#endif