Split up optabs.[hc]

optabs.[hc] is a bit of a behemoth.  It includes basic functions for querying
what a target can do, related tree- and gimple-level query functions,
related rtl-level query functions, and the functions that actually
generate code.  Some gimple optimisations therefore need:

#include "insn-config.h"
#include "expmed.h"
#include "dojump.h"
#include "explow.h"
#include "emit-rtl.h"
#include "varasm.h"
#include "stmt.h"
#include "expr.h"

purely to query whether the target has support for a particular operation.

This patch splits optabs up as follows:

      - optabs-query.[hc]: IL-independent functions for querying what a target
          can do natively.
      - optabs-tree.[hc]: tree and gimple query functions (an extension of
          optabs-query.[hc]).
      - optabs-libfuncs.[hc]: optabs-specific libfuncs (an extension of
          libfuncs.h)
      - optabs.h: For now includes optabs-query.h and optabs-libfuncs.h.

Only two files outside optabs need to include both optabs.h and
optabs-tree.h: expr.c and function.c.  I think that's expected given
that both are related to expand.

It might be good to split optabs.h further, but this is already quite
a big patch.

I changed can_conditionally_move_p from returning an int to returning
a bool and fixed a few formatting glitches.  There should be no other
changes to the functions themselves.

gcc/
	* Makefile.in (OBJS): Add optabs-libfuncs.o, optabs-query.o
	and optabs-tree.o.
	(GTFILES): Replace optabs.c with optabs-libfunc.c.
	* genopinit.c (main): Add an include guard to insn-opinit.h.
	Protect the rtx_code parts with NUM_RTX_CODE.
	* optabs.h: Split parts out to...
	* optabs-libfuncs.h, optabs-query.h, optabs-tree.h: ...these
	new files.
	* optabs.c: Split parts out to...
	* optabs-libfuncs.c, optabs-query.c, optabs-tree.c: ...these
	new files.
	* cilk-common.c: Include optabs-query.h rather than optabs.h.
	* fold-const.c: Likewise.
	* target-globals.c: Likewise.
	* tree-if-conv.c: Likewise.
	* tree-ssa-forwprop.c: Likewise.
	* tree-ssa-loop-prefetch.c: Likewise.
	* tree-ssa-math-opts.c: Include optabs-tree.h rather than
	optabs.h.  Remove unncessary include files.
	* tree-ssa-phiopt.c: Likewise.
	* tree-ssa-reassoc.c: Likewise.
	* tree-switch-conversion.c: Likewise.
	* tree-vect-data-refs.c: Likewise.
	* tree-vect-generic.c: Likewise.
	* tree-vect-loop.c: Likewise.
	* tree-vect-patterns.c: Likewise.
	* tree-vect-slp.c: Likewise.
	* tree-vect-stmts.c: Likewise.
	* tree-vrp.c: Likewise.
	* toplev.c: Include optabs-query.h and optabs-libfuncs.h
	rather than optabs.h.
	* expr.c: Include optabs-tree.h.
	* function.c: Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@227865 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 974 insertions, 0 deletions

diff --git a/gcc/optabs-libfuncs.c b/gcc/optabs-libfuncs.c
new file mode 100644
index 00000000000..bace520a79e
--- /dev/null
+++ b/gcc/optabs-libfuncs.c
@@ -0,0 +1,974 @@
+/* Mapping from optabs to underlying library functions
+   Copyright (C) 1987-2015 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC 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 General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "target.h"
+#include "insn-codes.h"
+#include "optabs-libfuncs.h"
+#include "libfuncs.h"
+#include "optabs-query.h"
+#include "tree.h"
+#include "stringpool.h"
+#include "varasm.h"
+#include "stor-layout.h"
+#include "rtl.h"
+
+struct target_libfuncs default_target_libfuncs;
+#if SWITCHABLE_TARGET
+struct target_libfuncs *this_target_libfuncs = &default_target_libfuncs;
+#endif
+
+#define libfunc_hash \
+  (this_target_libfuncs->x_libfunc_hash)
+
+/* Prefixes for the current version of decimal floating point (BID vs. DPD) */
+#if ENABLE_DECIMAL_BID_FORMAT
+#define DECIMAL_PREFIX "bid_"
+#else
+#define DECIMAL_PREFIX "dpd_"
+#endif
+
+/* Used for libfunc_hash.  */
+
+hashval_t
+libfunc_hasher::hash (libfunc_entry *e)
+{
+  return ((e->mode1 + e->mode2 * NUM_MACHINE_MODES) ^ e->op);
+}
+
+/* Used for libfunc_hash.  */
+
+bool
+libfunc_hasher::equal (libfunc_entry *e1, libfunc_entry *e2)
+{
+  return e1->op == e2->op && e1->mode1 == e2->mode1 && e1->mode2 == e2->mode2;
+}
+
+/* Return libfunc corresponding operation defined by OPTAB converting
+   from MODE2 to MODE1.  Trigger lazy initialization if needed, return NULL
+   if no libfunc is available.  */
+rtx
+convert_optab_libfunc (convert_optab optab, machine_mode mode1,
+		       machine_mode mode2)
+{
+  struct libfunc_entry e;
+  struct libfunc_entry **slot;
+
+  /* ??? This ought to be an assert, but not all of the places
+     that we expand optabs know about the optabs that got moved
+     to being direct.  */
+  if (!(optab >= FIRST_CONV_OPTAB && optab <= LAST_CONVLIB_OPTAB))
+    return NULL_RTX;
+
+  e.op = optab;
+  e.mode1 = mode1;
+  e.mode2 = mode2;
+  slot = libfunc_hash->find_slot (&e, NO_INSERT);
+  if (!slot)
+    {
+      const struct convert_optab_libcall_d *d
+	= &convlib_def[optab - FIRST_CONV_OPTAB];
+
+      if (d->libcall_gen == NULL)
+	return NULL;
+
+      d->libcall_gen (optab, d->libcall_basename, mode1, mode2);
+      slot = libfunc_hash->find_slot (&e, NO_INSERT);
+      if (!slot)
+	return NULL;
+    }
+  return (*slot)->libfunc;
+}
+
+/* Return libfunc corresponding operation defined by OPTAB in MODE.
+   Trigger lazy initialization if needed, return NULL if no libfunc is
+   available.  */
+rtx
+optab_libfunc (optab optab, machine_mode mode)
+{
+  struct libfunc_entry e;
+  struct libfunc_entry **slot;
+
+  /* ??? This ought to be an assert, but not all of the places
+     that we expand optabs know about the optabs that got moved
+     to being direct.  */
+  if (!(optab >= FIRST_NORM_OPTAB && optab <= LAST_NORMLIB_OPTAB))
+    return NULL_RTX;
+
+  e.op = optab;
+  e.mode1 = mode;
+  e.mode2 = VOIDmode;
+  slot = libfunc_hash->find_slot (&e, NO_INSERT);
+  if (!slot)
+    {
+      const struct optab_libcall_d *d
+	= &normlib_def[optab - FIRST_NORM_OPTAB];
+
+      if (d->libcall_gen == NULL)
+	return NULL;
+
+      d->libcall_gen (optab, d->libcall_basename, d->libcall_suffix, mode);
+      slot = libfunc_hash->find_slot (&e, NO_INSERT);
+      if (!slot)
+	return NULL;
+    }
+  return (*slot)->libfunc;
+}
+
+/* Initialize the libfunc fields of an entire group of entries in some
+   optab.  Each entry is set equal to a string consisting of a leading
+   pair of underscores followed by a generic operation name followed by
+   a mode name (downshifted to lowercase) followed by a single character
+   representing the number of operands for the given operation (which is
+   usually one of the characters '2', '3', or '4').
+
+   OPTABLE is the table in which libfunc fields are to be initialized.
+   OPNAME is the generic (string) name of the operation.
+   SUFFIX is the character which specifies the number of operands for
+     the given generic operation.
+   MODE is the mode to generate for.  */
+
+static void
+gen_libfunc (optab optable, const char *opname, int suffix,
+	     machine_mode mode)
+{
+  unsigned opname_len = strlen (opname);
+  const char *mname = GET_MODE_NAME (mode);
+  unsigned mname_len = strlen (mname);
+  int prefix_len = targetm.libfunc_gnu_prefix ? 6 : 2;
+  int len = prefix_len + opname_len + mname_len + 1 + 1;
+  char *libfunc_name = XALLOCAVEC (char, len);
+  char *p;
+  const char *q;
+
+  p = libfunc_name;
+  *p++ = '_';
+  *p++ = '_';
+  if (targetm.libfunc_gnu_prefix)
+    {
+      *p++ = 'g';
+      *p++ = 'n';
+      *p++ = 'u';
+      *p++ = '_';
+    }
+  for (q = opname; *q;)
+    *p++ = *q++;
+  for (q = mname; *q; q++)
+    *p++ = TOLOWER (*q);
+  *p++ = suffix;
+  *p = '\0';
+
+  set_optab_libfunc (optable, mode,
+		     ggc_alloc_string (libfunc_name, p - libfunc_name));
+}
+
+/* Like gen_libfunc, but verify that integer operation is involved.  */
+
+void
+gen_int_libfunc (optab optable, const char *opname, char suffix,
+		 machine_mode mode)
+{
+  int maxsize = 2 * BITS_PER_WORD;
+  int minsize = BITS_PER_WORD;
+
+  if (GET_MODE_CLASS (mode) != MODE_INT)
+    return;
+  if (maxsize < LONG_LONG_TYPE_SIZE)
+    maxsize = LONG_LONG_TYPE_SIZE;
+  if (minsize > INT_TYPE_SIZE
+      && (trapv_binoptab_p (optable)
+	  || trapv_unoptab_p (optable)))
+    minsize = INT_TYPE_SIZE;
+  if (GET_MODE_BITSIZE (mode) < minsize
+      || GET_MODE_BITSIZE (mode) > maxsize)
+    return;
+  gen_libfunc (optable, opname, suffix, mode);
+}
+
+/* Like gen_libfunc, but verify that FP and set decimal prefix if needed.  */
+
+void
+gen_fp_libfunc (optab optable, const char *opname, char suffix,
+		machine_mode mode)
+{
+  char *dec_opname;
+
+  if (GET_MODE_CLASS (mode) == MODE_FLOAT)
+    gen_libfunc (optable, opname, suffix, mode);
+  if (DECIMAL_FLOAT_MODE_P (mode))
+    {
+      dec_opname = XALLOCAVEC (char, sizeof (DECIMAL_PREFIX) + strlen (opname));
+      /* For BID support, change the name to have either a bid_ or dpd_ prefix
+	 depending on the low level floating format used.  */
+      memcpy (dec_opname, DECIMAL_PREFIX, sizeof (DECIMAL_PREFIX) - 1);
+      strcpy (dec_opname + sizeof (DECIMAL_PREFIX) - 1, opname);
+      gen_libfunc (optable, dec_opname, suffix, mode);
+    }
+}
+
+/* Like gen_libfunc, but verify that fixed-point operation is involved.  */
+
+void
+gen_fixed_libfunc (optab optable, const char *opname, char suffix,
+		   machine_mode mode)
+{
+  if (!ALL_FIXED_POINT_MODE_P (mode))
+    return;
+  gen_libfunc (optable, opname, suffix, mode);
+}
+
+/* Like gen_libfunc, but verify that signed fixed-point operation is
+   involved.  */
+
+void
+gen_signed_fixed_libfunc (optab optable, const char *opname, char suffix,
+			  machine_mode mode)
+{
+  if (!SIGNED_FIXED_POINT_MODE_P (mode))
+    return;
+  gen_libfunc (optable, opname, suffix, mode);
+}
+
+/* Like gen_libfunc, but verify that unsigned fixed-point operation is
+   involved.  */
+
+void
+gen_unsigned_fixed_libfunc (optab optable, const char *opname, char suffix,
+			    machine_mode mode)
+{
+  if (!UNSIGNED_FIXED_POINT_MODE_P (mode))
+    return;
+  gen_libfunc (optable, opname, suffix, mode);
+}
+
+/* Like gen_libfunc, but verify that FP or INT operation is involved.  */
+
+void
+gen_int_fp_libfunc (optab optable, const char *name, char suffix,
+		    machine_mode mode)
+{
+  if (DECIMAL_FLOAT_MODE_P (mode) || GET_MODE_CLASS (mode) == MODE_FLOAT)
+    gen_fp_libfunc (optable, name, suffix, mode);
+  if (INTEGRAL_MODE_P (mode))
+    gen_int_libfunc (optable, name, suffix, mode);
+}
+
+/* Like gen_libfunc, but verify that FP or INT operation is involved
+   and add 'v' suffix for integer operation.  */
+
+void
+gen_intv_fp_libfunc (optab optable, const char *name, char suffix,
+		     machine_mode mode)
+{
+  if (DECIMAL_FLOAT_MODE_P (mode) || GET_MODE_CLASS (mode) == MODE_FLOAT)
+    gen_fp_libfunc (optable, name, suffix, mode);
+  if (GET_MODE_CLASS (mode) == MODE_INT)
+    {
+      int len = strlen (name);
+      char *v_name = XALLOCAVEC (char, len + 2);
+      strcpy (v_name, name);
+      v_name[len] = 'v';
+      v_name[len + 1] = 0;
+      gen_int_libfunc (optable, v_name, suffix, mode);
+    }
+}
+
+/* Like gen_libfunc, but verify that FP or INT or FIXED operation is
+   involved.  */
+
+void
+gen_int_fp_fixed_libfunc (optab optable, const char *name, char suffix,
+			  machine_mode mode)
+{
+  if (DECIMAL_FLOAT_MODE_P (mode) || GET_MODE_CLASS (mode) == MODE_FLOAT)
+    gen_fp_libfunc (optable, name, suffix, mode);
+  if (INTEGRAL_MODE_P (mode))
+    gen_int_libfunc (optable, name, suffix, mode);
+  if (ALL_FIXED_POINT_MODE_P (mode))
+    gen_fixed_libfunc (optable, name, suffix, mode);
+}
+
+/* Like gen_libfunc, but verify that FP or INT or signed FIXED operation is
+   involved.  */
+
+void
+gen_int_fp_signed_fixed_libfunc (optab optable, const char *name, char suffix,
+				 machine_mode mode)
+{
+  if (DECIMAL_FLOAT_MODE_P (mode) || GET_MODE_CLASS (mode) == MODE_FLOAT)
+    gen_fp_libfunc (optable, name, suffix, mode);
+  if (INTEGRAL_MODE_P (mode))
+    gen_int_libfunc (optable, name, suffix, mode);
+  if (SIGNED_FIXED_POINT_MODE_P (mode))
+    gen_signed_fixed_libfunc (optable, name, suffix, mode);
+}
+
+/* Like gen_libfunc, but verify that INT or FIXED operation is
+   involved.  */
+
+void
+gen_int_fixed_libfunc (optab optable, const char *name, char suffix,
+		       machine_mode mode)
+{
+  if (INTEGRAL_MODE_P (mode))
+    gen_int_libfunc (optable, name, suffix, mode);
+  if (ALL_FIXED_POINT_MODE_P (mode))
+    gen_fixed_libfunc (optable, name, suffix, mode);
+}
+
+/* Like gen_libfunc, but verify that INT or signed FIXED operation is
+   involved.  */
+
+void
+gen_int_signed_fixed_libfunc (optab optable, const char *name, char suffix,
+			      machine_mode mode)
+{
+  if (INTEGRAL_MODE_P (mode))
+    gen_int_libfunc (optable, name, suffix, mode);
+  if (SIGNED_FIXED_POINT_MODE_P (mode))
+    gen_signed_fixed_libfunc (optable, name, suffix, mode);
+}
+
+/* Like gen_libfunc, but verify that INT or unsigned FIXED operation is
+   involved.  */
+
+void
+gen_int_unsigned_fixed_libfunc (optab optable, const char *name, char suffix,
+				machine_mode mode)
+{
+  if (INTEGRAL_MODE_P (mode))
+    gen_int_libfunc (optable, name, suffix, mode);
+  if (UNSIGNED_FIXED_POINT_MODE_P (mode))
+    gen_unsigned_fixed_libfunc (optable, name, suffix, mode);
+}
+
+/* Initialize the libfunc fields of an entire group of entries of an
+   inter-mode-class conversion optab.  The string formation rules are
+   similar to the ones for init_libfuncs, above, but instead of having
+   a mode name and an operand count these functions have two mode names
+   and no operand count.  */
+
+void
+gen_interclass_conv_libfunc (convert_optab tab,
+			     const char *opname,
+			     machine_mode tmode,
+			     machine_mode fmode)
+{
+  size_t opname_len = strlen (opname);
+  size_t mname_len = 0;
+
+  const char *fname, *tname;
+  const char *q;
+  int prefix_len = targetm.libfunc_gnu_prefix ? 6 : 2;
+  char *libfunc_name, *suffix;
+  char *nondec_name, *dec_name, *nondec_suffix, *dec_suffix;
+  char *p;
+
+  /* If this is a decimal conversion, add the current BID vs. DPD prefix that
+     depends on which underlying decimal floating point format is used.  */
+  const size_t dec_len = sizeof (DECIMAL_PREFIX) - 1;
+
+  mname_len = strlen (GET_MODE_NAME (tmode)) + strlen (GET_MODE_NAME (fmode));
+
+  nondec_name = XALLOCAVEC (char, prefix_len + opname_len + mname_len + 1 + 1);
+  nondec_name[0] = '_';
+  nondec_name[1] = '_';
+  if (targetm.libfunc_gnu_prefix)
+    {
+      nondec_name[2] = 'g';
+      nondec_name[3] = 'n';
+      nondec_name[4] = 'u';
+      nondec_name[5] = '_';
+    }
+
+  memcpy (&nondec_name[prefix_len], opname, opname_len);
+  nondec_suffix = nondec_name + opname_len + prefix_len;
+
+  dec_name = XALLOCAVEC (char, 2 + dec_len + opname_len + mname_len + 1 + 1);
+  dec_name[0] = '_';
+  dec_name[1] = '_';
+  memcpy (&dec_name[2], DECIMAL_PREFIX, dec_len);
+  memcpy (&dec_name[2+dec_len], opname, opname_len);
+  dec_suffix = dec_name + dec_len + opname_len + 2;
+
+  fname = GET_MODE_NAME (fmode);
+  tname = GET_MODE_NAME (tmode);
+
+  if (DECIMAL_FLOAT_MODE_P (fmode) || DECIMAL_FLOAT_MODE_P (tmode))
+    {
+      libfunc_name = dec_name;
+      suffix = dec_suffix;
+    }
+  else
+    {
+      libfunc_name = nondec_name;
+      suffix = nondec_suffix;
+    }
+
+  p = suffix;
+  for (q = fname; *q; p++, q++)
+    *p = TOLOWER (*q);
+  for (q = tname; *q; p++, q++)
+    *p = TOLOWER (*q);
+
+  *p = '\0';
+
+  set_conv_libfunc (tab, tmode, fmode,
+		    ggc_alloc_string (libfunc_name, p - libfunc_name));
+}
+
+/* Same as gen_interclass_conv_libfunc but verify that we are producing
+   int->fp conversion.  */
+
+void
+gen_int_to_fp_conv_libfunc (convert_optab tab,
+			    const char *opname,
+			    machine_mode tmode,
+			    machine_mode fmode)
+{
+  if (GET_MODE_CLASS (fmode) != MODE_INT)
+    return;
+  if (GET_MODE_CLASS (tmode) != MODE_FLOAT && !DECIMAL_FLOAT_MODE_P (tmode))
+    return;
+  gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
+}
+
+/* ufloat_optab is special by using floatun for FP and floatuns decimal fp
+   naming scheme.  */
+
+void
+gen_ufloat_conv_libfunc (convert_optab tab,
+			 const char *opname ATTRIBUTE_UNUSED,
+			 machine_mode tmode,
+			 machine_mode fmode)
+{
+  if (DECIMAL_FLOAT_MODE_P (tmode))
+    gen_int_to_fp_conv_libfunc (tab, "floatuns", tmode, fmode);
+  else
+    gen_int_to_fp_conv_libfunc (tab, "floatun", tmode, fmode);
+}
+
+/* Same as gen_interclass_conv_libfunc but verify that we are producing
+   fp->int conversion.  */
+
+void
+gen_int_to_fp_nondecimal_conv_libfunc (convert_optab tab,
+				       const char *opname,
+				       machine_mode tmode,
+				       machine_mode fmode)
+{
+  if (GET_MODE_CLASS (fmode) != MODE_INT)
+    return;
+  if (GET_MODE_CLASS (tmode) != MODE_FLOAT)
+    return;
+  gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
+}
+
+/* Same as gen_interclass_conv_libfunc but verify that we are producing
+   fp->int conversion with no decimal floating point involved.  */
+
+void
+gen_fp_to_int_conv_libfunc (convert_optab tab,
+			    const char *opname,
+			    machine_mode tmode,
+			    machine_mode fmode)
+{
+  if (GET_MODE_CLASS (fmode) != MODE_FLOAT && !DECIMAL_FLOAT_MODE_P (fmode))
+    return;
+  if (GET_MODE_CLASS (tmode) != MODE_INT)
+    return;
+  gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
+}
+
+/* Initialize the libfunc fields of an of an intra-mode-class conversion optab.
+   The string formation rules are
+   similar to the ones for init_libfunc, above.  */
+
+void
+gen_intraclass_conv_libfunc (convert_optab tab, const char *opname,
+			     machine_mode tmode, machine_mode fmode)
+{
+  size_t opname_len = strlen (opname);
+  size_t mname_len = 0;
+
+  const char *fname, *tname;
+  const char *q;
+  int prefix_len = targetm.libfunc_gnu_prefix ? 6 : 2;
+  char *nondec_name, *dec_name, *nondec_suffix, *dec_suffix;
+  char *libfunc_name, *suffix;
+  char *p;
+
+  /* If this is a decimal conversion, add the current BID vs. DPD prefix that
+     depends on which underlying decimal floating point format is used.  */
+  const size_t dec_len = sizeof (DECIMAL_PREFIX) - 1;
+
+  mname_len = strlen (GET_MODE_NAME (tmode)) + strlen (GET_MODE_NAME (fmode));
+
+  nondec_name = XALLOCAVEC (char, 2 + opname_len + mname_len + 1 + 1);
+  nondec_name[0] = '_';
+  nondec_name[1] = '_';
+  if (targetm.libfunc_gnu_prefix)
+    {
+      nondec_name[2] = 'g';
+      nondec_name[3] = 'n';
+      nondec_name[4] = 'u';
+      nondec_name[5] = '_';
+    }
+  memcpy (&nondec_name[prefix_len], opname, opname_len);
+  nondec_suffix = nondec_name + opname_len + prefix_len;
+
+  dec_name = XALLOCAVEC (char, 2 + dec_len + opname_len + mname_len + 1 + 1);
+  dec_name[0] = '_';
+  dec_name[1] = '_';
+  memcpy (&dec_name[2], DECIMAL_PREFIX, dec_len);
+  memcpy (&dec_name[2 + dec_len], opname, opname_len);
+  dec_suffix = dec_name + dec_len + opname_len + 2;
+
+  fname = GET_MODE_NAME (fmode);
+  tname = GET_MODE_NAME (tmode);
+
+  if (DECIMAL_FLOAT_MODE_P (fmode) || DECIMAL_FLOAT_MODE_P (tmode))
+    {
+      libfunc_name = dec_name;
+      suffix = dec_suffix;
+    }
+  else
+    {
+      libfunc_name = nondec_name;
+      suffix = nondec_suffix;
+    }
+
+  p = suffix;
+  for (q = fname; *q; p++, q++)
+    *p = TOLOWER (*q);
+  for (q = tname; *q; p++, q++)
+    *p = TOLOWER (*q);
+
+  *p++ = '2';
+  *p = '\0';
+
+  set_conv_libfunc (tab, tmode, fmode,
+		    ggc_alloc_string (libfunc_name, p - libfunc_name));
+}
+
+/* Pick proper libcall for trunc_optab.  We need to chose if we do
+   truncation or extension and interclass or intraclass.  */
+
+void
+gen_trunc_conv_libfunc (convert_optab tab,
+			const char *opname,
+			machine_mode tmode,
+			machine_mode fmode)
+{
+  if (GET_MODE_CLASS (tmode) != MODE_FLOAT && !DECIMAL_FLOAT_MODE_P (tmode))
+    return;
+  if (GET_MODE_CLASS (fmode) != MODE_FLOAT && !DECIMAL_FLOAT_MODE_P (fmode))
+    return;
+  if (tmode == fmode)
+    return;
+
+  if ((GET_MODE_CLASS (tmode) == MODE_FLOAT && DECIMAL_FLOAT_MODE_P (fmode))
+      || (GET_MODE_CLASS (fmode) == MODE_FLOAT && DECIMAL_FLOAT_MODE_P (tmode)))
+     gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
+
+  if (GET_MODE_PRECISION (fmode) <= GET_MODE_PRECISION (tmode))
+    return;
+
+  if ((GET_MODE_CLASS (tmode) == MODE_FLOAT
+       && GET_MODE_CLASS (fmode) == MODE_FLOAT)
+      || (DECIMAL_FLOAT_MODE_P (fmode) && DECIMAL_FLOAT_MODE_P (tmode)))
+    gen_intraclass_conv_libfunc (tab, opname, tmode, fmode);
+}
+
+/* Pick proper libcall for extend_optab.  We need to chose if we do
+   truncation or extension and interclass or intraclass.  */
+
+void
+gen_extend_conv_libfunc (convert_optab tab,
+			 const char *opname ATTRIBUTE_UNUSED,
+			 machine_mode tmode,
+			 machine_mode fmode)
+{
+  if (GET_MODE_CLASS (tmode) != MODE_FLOAT && !DECIMAL_FLOAT_MODE_P (tmode))
+    return;
+  if (GET_MODE_CLASS (fmode) != MODE_FLOAT && !DECIMAL_FLOAT_MODE_P (fmode))
+    return;
+  if (tmode == fmode)
+    return;
+
+  if ((GET_MODE_CLASS (tmode) == MODE_FLOAT && DECIMAL_FLOAT_MODE_P (fmode))
+      || (GET_MODE_CLASS (fmode) == MODE_FLOAT && DECIMAL_FLOAT_MODE_P (tmode)))
+     gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
+
+  if (GET_MODE_PRECISION (fmode) > GET_MODE_PRECISION (tmode))
+    return;
+
+  if ((GET_MODE_CLASS (tmode) == MODE_FLOAT
+       && GET_MODE_CLASS (fmode) == MODE_FLOAT)
+      || (DECIMAL_FLOAT_MODE_P (fmode) && DECIMAL_FLOAT_MODE_P (tmode)))
+    gen_intraclass_conv_libfunc (tab, opname, tmode, fmode);
+}
+
+/* Pick proper libcall for fract_optab.  We need to chose if we do
+   interclass or intraclass.  */
+
+void
+gen_fract_conv_libfunc (convert_optab tab,
+			const char *opname,
+			machine_mode tmode,
+			machine_mode fmode)
+{
+  if (tmode == fmode)
+    return;
+  if (!(ALL_FIXED_POINT_MODE_P (tmode) || ALL_FIXED_POINT_MODE_P (fmode)))
+    return;
+
+  if (GET_MODE_CLASS (tmode) == GET_MODE_CLASS (fmode))
+    gen_intraclass_conv_libfunc (tab, opname, tmode, fmode);
+  else
+    gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
+}
+
+/* Pick proper libcall for fractuns_optab.  */
+
+void
+gen_fractuns_conv_libfunc (convert_optab tab,
+			   const char *opname,
+			   machine_mode tmode,
+			   machine_mode fmode)
+{
+  if (tmode == fmode)
+    return;
+  /* One mode must be a fixed-point mode, and the other must be an integer
+     mode.  */
+  if (!((ALL_FIXED_POINT_MODE_P (tmode) && GET_MODE_CLASS (fmode) == MODE_INT)
+	|| (ALL_FIXED_POINT_MODE_P (fmode)
+	    && GET_MODE_CLASS (tmode) == MODE_INT)))
+    return;
+
+  gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
+}
+
+/* Pick proper libcall for satfract_optab.  We need to chose if we do
+   interclass or intraclass.  */
+
+void
+gen_satfract_conv_libfunc (convert_optab tab,
+			   const char *opname,
+			   machine_mode tmode,
+			   machine_mode fmode)
+{
+  if (tmode == fmode)
+    return;
+  /* TMODE must be a fixed-point mode.  */
+  if (!ALL_FIXED_POINT_MODE_P (tmode))
+    return;
+
+  if (GET_MODE_CLASS (tmode) == GET_MODE_CLASS (fmode))
+    gen_intraclass_conv_libfunc (tab, opname, tmode, fmode);
+  else
+    gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
+}
+
+/* Pick proper libcall for satfractuns_optab.  */
+
+void
+gen_satfractuns_conv_libfunc (convert_optab tab,
+			      const char *opname,
+			      machine_mode tmode,
+			      machine_mode fmode)
+{
+  if (tmode == fmode)
+    return;
+  /* TMODE must be a fixed-point mode, and FMODE must be an integer mode.  */
+  if (!(ALL_FIXED_POINT_MODE_P (tmode) && GET_MODE_CLASS (fmode) == MODE_INT))
+    return;
+
+  gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
+}
+
+/* Hashtable callbacks for libfunc_decls.  */
+
+struct libfunc_decl_hasher : ggc_ptr_hash<tree_node>
+{
+  static hashval_t
+  hash (tree entry)
+  {
+    return IDENTIFIER_HASH_VALUE (DECL_NAME (entry));
+  }
+
+  static bool
+  equal (tree decl, tree name)
+  {
+    return DECL_NAME (decl) == name;
+  }
+};
+
+/* A table of previously-created libfuncs, hashed by name.  */
+static GTY (()) hash_table<libfunc_decl_hasher> *libfunc_decls;
+
+/* Build a decl for a libfunc named NAME.  */
+
+tree
+build_libfunc_function (const char *name)
+{
+  tree decl = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
+			  get_identifier (name),
+			  build_function_type (integer_type_node, NULL_TREE));
+  /* ??? We don't have any type information except for this is
+     a function.  Pretend this is "int foo ()".  */
+  DECL_ARTIFICIAL (decl) = 1;
+  DECL_EXTERNAL (decl) = 1;
+  TREE_PUBLIC (decl) = 1;
+  gcc_assert (DECL_ASSEMBLER_NAME (decl));
+
+  /* Zap the nonsensical SYMBOL_REF_DECL for this.  What we're left with
+     are the flags assigned by targetm.encode_section_info.  */
+  SET_SYMBOL_REF_DECL (XEXP (DECL_RTL (decl), 0), NULL);
+
+  return decl;
+}
+
+/* Return a libfunc for NAME, creating one if we don't already have one.
+   The returned rtx is a SYMBOL_REF.  */
+
+rtx
+init_one_libfunc (const char *name)
+{
+  tree id, decl;
+  hashval_t hash;
+
+  if (libfunc_decls == NULL)
+    libfunc_decls = hash_table<libfunc_decl_hasher>::create_ggc (37);
+
+  /* See if we have already created a libfunc decl for this function.  */
+  id = get_identifier (name);
+  hash = IDENTIFIER_HASH_VALUE (id);
+  tree *slot = libfunc_decls->find_slot_with_hash (id, hash, INSERT);
+  decl = *slot;
+  if (decl == NULL)
+    {
+      /* Create a new decl, so that it can be passed to
+	 targetm.encode_section_info.  */
+      decl = build_libfunc_function (name);
+      *slot = decl;
+    }
+  return XEXP (DECL_RTL (decl), 0);
+}
+
+/* Adjust the assembler name of libfunc NAME to ASMSPEC.  */
+
+rtx
+set_user_assembler_libfunc (const char *name, const char *asmspec)
+{
+  tree id, decl;
+  hashval_t hash;
+
+  id = get_identifier (name);
+  hash = IDENTIFIER_HASH_VALUE (id);
+  tree *slot = libfunc_decls->find_slot_with_hash (id, hash, NO_INSERT);
+  gcc_assert (slot);
+  decl = (tree) *slot;
+  set_user_assembler_name (decl, asmspec);
+  return XEXP (DECL_RTL (decl), 0);
+}
+
+/* Call this to reset the function entry for one optab (OPTABLE) in mode
+   MODE to NAME, which should be either 0 or a string constant.  */
+
+void
+set_optab_libfunc (optab op, machine_mode mode, const char *name)
+{
+  rtx val;
+  struct libfunc_entry e;
+  struct libfunc_entry **slot;
+
+  e.op = op;
+  e.mode1 = mode;
+  e.mode2 = VOIDmode;
+
+  if (name)
+    val = init_one_libfunc (name);
+  else
+    val = 0;
+  slot = libfunc_hash->find_slot (&e, INSERT);
+  if (*slot == NULL)
+    *slot = ggc_alloc<libfunc_entry> ();
+  (*slot)->op = op;
+  (*slot)->mode1 = mode;
+  (*slot)->mode2 = VOIDmode;
+  (*slot)->libfunc = val;
+}
+
+/* Call this to reset the function entry for one conversion optab
+   (OPTABLE) from mode FMODE to mode TMODE to NAME, which should be
+   either 0 or a string constant.  */
+
+void
+set_conv_libfunc (convert_optab optab, machine_mode tmode,
+		  machine_mode fmode, const char *name)
+{
+  rtx val;
+  struct libfunc_entry e;
+  struct libfunc_entry **slot;
+
+  e.op = optab;
+  e.mode1 = tmode;
+  e.mode2 = fmode;
+
+  if (name)
+    val = init_one_libfunc (name);
+  else
+    val = 0;
+  slot = libfunc_hash->find_slot (&e, INSERT);
+  if (*slot == NULL)
+    *slot = ggc_alloc<libfunc_entry> ();
+  (*slot)->op = optab;
+  (*slot)->mode1 = tmode;
+  (*slot)->mode2 = fmode;
+  (*slot)->libfunc = val;
+}
+
+/* Call this to initialize the contents of the optabs
+   appropriately for the current target machine.  */
+
+void
+init_optabs (void)
+{
+  if (libfunc_hash)
+    libfunc_hash->empty ();
+  else
+    libfunc_hash = hash_table<libfunc_hasher>::create_ggc (10);
+
+  /* Fill in the optabs with the insns we support.  */
+  init_all_optabs (this_fn_optabs);
+
+  /* The ffs function operates on `int'.  Fall back on it if we do not
+     have a libgcc2 function for that width.  */
+  if (INT_TYPE_SIZE < BITS_PER_WORD)
+    set_optab_libfunc (ffs_optab, mode_for_size (INT_TYPE_SIZE, MODE_INT, 0),
+		       "ffs");
+
+  /* Explicitly initialize the bswap libfuncs since we need them to be
+     valid for things other than word_mode.  */
+  if (targetm.libfunc_gnu_prefix)
+    {
+      set_optab_libfunc (bswap_optab, SImode, "__gnu_bswapsi2");
+      set_optab_libfunc (bswap_optab, DImode, "__gnu_bswapdi2");
+    }
+  else
+    {
+      set_optab_libfunc (bswap_optab, SImode, "__bswapsi2");
+      set_optab_libfunc (bswap_optab, DImode, "__bswapdi2");
+    }
+
+  /* Use cabs for double complex abs, since systems generally have cabs.
+     Don't define any libcall for float complex, so that cabs will be used.  */
+  if (complex_double_type_node)
+    set_optab_libfunc (abs_optab, TYPE_MODE (complex_double_type_node),
+		       "cabs");
+
+  abort_libfunc = init_one_libfunc ("abort");
+  memcpy_libfunc = init_one_libfunc ("memcpy");
+  memmove_libfunc = init_one_libfunc ("memmove");
+  memcmp_libfunc = init_one_libfunc ("memcmp");
+  memset_libfunc = init_one_libfunc ("memset");
+  setbits_libfunc = init_one_libfunc ("__setbits");
+
+#ifndef DONT_USE_BUILTIN_SETJMP
+  setjmp_libfunc = init_one_libfunc ("__builtin_setjmp");
+  longjmp_libfunc = init_one_libfunc ("__builtin_longjmp");
+#else
+  setjmp_libfunc = init_one_libfunc ("setjmp");
+  longjmp_libfunc = init_one_libfunc ("longjmp");
+#endif
+  unwind_sjlj_register_libfunc = init_one_libfunc ("_Unwind_SjLj_Register");
+  unwind_sjlj_unregister_libfunc
+    = init_one_libfunc ("_Unwind_SjLj_Unregister");
+
+  /* For function entry/exit instrumentation.  */
+  profile_function_entry_libfunc
+    = init_one_libfunc ("__cyg_profile_func_enter");
+  profile_function_exit_libfunc
+    = init_one_libfunc ("__cyg_profile_func_exit");
+
+  gcov_flush_libfunc = init_one_libfunc ("__gcov_flush");
+
+  /* Allow the target to add more libcalls or rename some, etc.  */
+  targetm.init_libfuncs ();
+}
+
+/* A helper function for init_sync_libfuncs.  Using the basename BASE,
+   install libfuncs into TAB for BASE_N for 1 <= N <= MAX.  */
+
+static void
+init_sync_libfuncs_1 (optab tab, const char *base, int max)
+{
+  machine_mode mode;
+  char buf[64];
+  size_t len = strlen (base);
+  int i;
+
+  gcc_assert (max <= 8);
+  gcc_assert (len + 3 < sizeof (buf));
+
+  memcpy (buf, base, len);
+  buf[len] = '_';
+  buf[len + 1] = '0';
+  buf[len + 2] = '\0';
+
+  mode = QImode;
+  for (i = 1; i <= max; i *= 2)
+    {
+      buf[len + 1] = '0' + i;
+      set_optab_libfunc (tab, mode, buf);
+      mode = GET_MODE_2XWIDER_MODE (mode);
+    }
+}
+
+void
+init_sync_libfuncs (int max)
+{
+  if (!flag_sync_libcalls)
+    return;
+
+  init_sync_libfuncs_1 (sync_compare_and_swap_optab,
+			"__sync_val_compare_and_swap", max);
+  init_sync_libfuncs_1 (sync_lock_test_and_set_optab,
+			"__sync_lock_test_and_set", max);
+
+  init_sync_libfuncs_1 (sync_old_add_optab, "__sync_fetch_and_add", max);
+  init_sync_libfuncs_1 (sync_old_sub_optab, "__sync_fetch_and_sub", max);
+  init_sync_libfuncs_1 (sync_old_ior_optab, "__sync_fetch_and_or", max);
+  init_sync_libfuncs_1 (sync_old_and_optab, "__sync_fetch_and_and", max);
+  init_sync_libfuncs_1 (sync_old_xor_optab, "__sync_fetch_and_xor", max);
+  init_sync_libfuncs_1 (sync_old_nand_optab, "__sync_fetch_and_nand", max);
+
+  init_sync_libfuncs_1 (sync_new_add_optab, "__sync_add_and_fetch", max);
+  init_sync_libfuncs_1 (sync_new_sub_optab, "__sync_sub_and_fetch", max);
+  init_sync_libfuncs_1 (sync_new_ior_optab, "__sync_or_and_fetch", max);
+  init_sync_libfuncs_1 (sync_new_and_optab, "__sync_and_and_fetch", max);
+  init_sync_libfuncs_1 (sync_new_xor_optab, "__sync_xor_and_fetch", max);
+  init_sync_libfuncs_1 (sync_new_nand_optab, "__sync_nand_and_fetch", max);
+}
+
+#include "gt-optabs-libfuncs.h"