X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fdojump.c;h=0ebf932cfc5618933db2a48ad48f994977585976;hb=a50034a430a90b13dd4a5b96eb2305ba029ed4ac;hp=f19cbcc3d9144cc8448648408c35e8cd49af6852;hpb=55f9d7dcd373061a4699e25a28e3dbb86a92ff5a;p=pf3gnuchains%2Fgcc-fork.git

diff --git a/gcc/dojump.c b/gcc/dojump.c
index f19cbcc3d91..0ebf932cfc5 100644
--- a/gcc/dojump.c
+++ b/gcc/dojump.c
@@ -1,12 +1,13 @@
 /* Convert tree expression to rtl instructions, for GNU compiler.
    Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
-   2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+   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 2, or (at your option) any later
+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
@@ -15,9 +16,8 @@ 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 COPYING.  If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA.  */
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
 
 #include "config.h"
 #include "system.h"
@@ -34,12 +34,22 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 #include "optabs.h"
 #include "langhooks.h"
 #include "ggc.h"
+#include "basic-block.h"
+#include "output.h"
 
 static bool prefer_and_bit_test (enum machine_mode, int);
-static void do_jump_by_parts_greater (tree, int, rtx, rtx);
-static void do_jump_by_parts_equality (tree, rtx, rtx);
-static void do_compare_and_jump	(tree, enum rtx_code, enum rtx_code, rtx,
-				 rtx);
+static void do_jump_by_parts_greater (tree, tree, int, rtx, rtx, int);
+static void do_jump_by_parts_equality (tree, tree, rtx, rtx, int);
+static void do_compare_and_jump	(tree, tree, enum rtx_code, enum rtx_code, rtx,
+				 rtx, int);
+
+/* Invert probability if there is any.  -1 stands for unknown.  */
+
+static inline int
+inv (int prob)
+{
+  return prob == -1 ? -1 : REG_BR_PROB_BASE - prob;
+}
 
 /* At the start of a function, record that we have no previously-pushed
    arguments waiting to be popped.  */
@@ -50,6 +60,16 @@ init_pending_stack_adjust (void)
   pending_stack_adjust = 0;
 }
 
+/* Discard any pending stack adjustment.  This avoid relying on the
+   RTL optimizers to remove useless adjustments when we know the
+   stack pointer value is dead.  */
+void
+discard_pending_stack_adjust (void)
+{
+  stack_pointer_delta -= pending_stack_adjust;
+  pending_stack_adjust = 0;
+}
+
 /* When exiting from function, if safe, clear out any pending stack adjust
    so the adjustment won't get done.
 
@@ -60,14 +80,9 @@ void
 clear_pending_stack_adjust (void)
 {
   if (optimize > 0
-      && (! flag_omit_frame_pointer || current_function_calls_alloca)
-      && EXIT_IGNORE_STACK
-      && ! (DECL_INLINE (current_function_decl) && ! flag_no_inline)
-      && ! flag_inline_functions)
-    {
-      stack_pointer_delta -= pending_stack_adjust,
-      pending_stack_adjust = 0;
-    }
+      && (! flag_omit_frame_pointer || cfun->calls_alloca)
+      && EXIT_IGNORE_STACK)
+    discard_pending_stack_adjust ();
 }
 
 /* Pop any previously-pushed arguments that have not been popped yet.  */
@@ -90,17 +105,29 @@ do_pending_stack_adjust (void)
    functions here.  */
 
 void
-jumpifnot (tree exp, rtx label)
+jumpifnot (tree exp, rtx label, int prob)
 {
-  do_jump (exp, label, NULL_RTX);
+  do_jump (exp, label, NULL_RTX, inv (prob));
+}
+
+void
+jumpifnot_1 (enum tree_code code, tree op0, tree op1, rtx label, int prob)
+{
+  do_jump_1 (code, op0, op1, label, NULL_RTX, inv (prob));
 }
 
 /* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
 
 void
-jumpif (tree exp, rtx label)
+jumpif (tree exp, rtx label, int prob)
 {
-  do_jump (exp, NULL_RTX, label);
+  do_jump (exp, NULL_RTX, label, prob);
+}
+
+void
+jumpif_1 (enum tree_code code, tree op0, tree op1, rtx label, int prob)
+{
+  do_jump_1 (code, op0, op1, NULL_RTX, label, prob);
 }
 
 /* Used internally by prefer_and_bit_test.  */
@@ -135,11 +162,191 @@ prefer_and_bit_test (enum machine_mode mode, int bitnum)
     }
 
   /* Fill in the integers.  */
-  XEXP (and_test, 1) = GEN_INT ((unsigned HOST_WIDE_INT) 1 << bitnum);
+  XEXP (and_test, 1)
+    = immed_double_int_const (double_int_setbit (double_int_zero, bitnum),
+						 mode);
   XEXP (XEXP (shift_test, 0), 1) = GEN_INT (bitnum);
 
-  return (rtx_cost (and_test, IF_THEN_ELSE)
-	  <= rtx_cost (shift_test, IF_THEN_ELSE));
+  return (rtx_cost (and_test, IF_THEN_ELSE, optimize_insn_for_speed_p ())
+	  <= rtx_cost (shift_test, IF_THEN_ELSE, optimize_insn_for_speed_p ()));
+}
+
+/* Subroutine of do_jump, dealing with exploded comparisons of the type
+   OP0 CODE OP1 .  IF_FALSE_LABEL and IF_TRUE_LABEL like in do_jump.
+   PROB is probability of jump to if_true_label, or -1 if unknown.  */
+
+void
+do_jump_1 (enum tree_code code, tree op0, tree op1,
+	   rtx if_false_label, rtx if_true_label, int prob)
+{
+  enum machine_mode mode;
+  rtx drop_through_label = 0;
+
+  switch (code)
+    {
+    case EQ_EXPR:
+      {
+        tree inner_type = TREE_TYPE (op0);
+
+        gcc_assert (GET_MODE_CLASS (TYPE_MODE (inner_type))
+		    != MODE_COMPLEX_FLOAT);
+	gcc_assert (GET_MODE_CLASS (TYPE_MODE (inner_type))
+		    != MODE_COMPLEX_INT);
+
+        if (integer_zerop (op1))
+	  do_jump (op0, if_true_label, if_false_label, inv (prob));
+        else if (GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_INT
+                 && !can_compare_p (EQ, TYPE_MODE (inner_type), ccp_jump))
+	  do_jump_by_parts_equality (op0, op1, if_false_label, if_true_label,
+				     prob);
+        else
+	  do_compare_and_jump (op0, op1, EQ, EQ, if_false_label, if_true_label,
+			       prob);
+        break;
+      }
+
+    case NE_EXPR:
+      {
+        tree inner_type = TREE_TYPE (op0);
+
+        gcc_assert (GET_MODE_CLASS (TYPE_MODE (inner_type))
+		    != MODE_COMPLEX_FLOAT);
+	gcc_assert (GET_MODE_CLASS (TYPE_MODE (inner_type))
+		    != MODE_COMPLEX_INT);
+
+        if (integer_zerop (op1))
+	  do_jump (op0, if_false_label, if_true_label, prob);
+        else if (GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_INT
+           && !can_compare_p (NE, TYPE_MODE (inner_type), ccp_jump))
+	  do_jump_by_parts_equality (op0, op1, if_true_label, if_false_label,
+				     inv (prob));
+        else
+	  do_compare_and_jump (op0, op1, NE, NE, if_false_label, if_true_label,
+			       prob);
+        break;
+      }
+
+    case LT_EXPR:
+      mode = TYPE_MODE (TREE_TYPE (op0));
+      if (GET_MODE_CLASS (mode) == MODE_INT
+          && ! can_compare_p (LT, mode, ccp_jump))
+	do_jump_by_parts_greater (op0, op1, 1, if_false_label, if_true_label,
+				  prob);
+      else
+	do_compare_and_jump (op0, op1, LT, LTU, if_false_label, if_true_label,
+			     prob);
+      break;
+
+    case LE_EXPR:
+      mode = TYPE_MODE (TREE_TYPE (op0));
+      if (GET_MODE_CLASS (mode) == MODE_INT
+          && ! can_compare_p (LE, mode, ccp_jump))
+	do_jump_by_parts_greater (op0, op1, 0, if_true_label, if_false_label,
+				  inv (prob));
+      else
+	do_compare_and_jump (op0, op1, LE, LEU, if_false_label, if_true_label,
+			     prob);
+      break;
+
+    case GT_EXPR:
+      mode = TYPE_MODE (TREE_TYPE (op0));
+      if (GET_MODE_CLASS (mode) == MODE_INT
+          && ! can_compare_p (GT, mode, ccp_jump))
+	do_jump_by_parts_greater (op0, op1, 0, if_false_label, if_true_label,
+				  prob);
+      else
+	do_compare_and_jump (op0, op1, GT, GTU, if_false_label, if_true_label,
+			     prob);
+      break;
+
+    case GE_EXPR:
+      mode = TYPE_MODE (TREE_TYPE (op0));
+      if (GET_MODE_CLASS (mode) == MODE_INT
+          && ! can_compare_p (GE, mode, ccp_jump))
+	do_jump_by_parts_greater (op0, op1, 1, if_true_label, if_false_label,
+				  inv (prob));
+      else
+	do_compare_and_jump (op0, op1, GE, GEU, if_false_label, if_true_label,
+			     prob);
+      break;
+
+    case ORDERED_EXPR:
+      do_compare_and_jump (op0, op1, ORDERED, ORDERED,
+			   if_false_label, if_true_label, prob);
+      break;
+
+    case UNORDERED_EXPR:
+      do_compare_and_jump (op0, op1, UNORDERED, UNORDERED,
+			   if_false_label, if_true_label, prob);
+      break;
+
+    case UNLT_EXPR:
+      do_compare_and_jump (op0, op1, UNLT, UNLT, if_false_label, if_true_label,
+			   prob);
+      break;
+
+    case UNLE_EXPR:
+      do_compare_and_jump (op0, op1, UNLE, UNLE, if_false_label, if_true_label,
+			   prob);
+      break;
+
+    case UNGT_EXPR:
+      do_compare_and_jump (op0, op1, UNGT, UNGT, if_false_label, if_true_label,
+			   prob);
+      break;
+
+    case UNGE_EXPR:
+      do_compare_and_jump (op0, op1, UNGE, UNGE, if_false_label, if_true_label,
+			   prob);
+      break;
+
+    case UNEQ_EXPR:
+      do_compare_and_jump (op0, op1, UNEQ, UNEQ, if_false_label, if_true_label,
+			   prob);
+      break;
+
+    case LTGT_EXPR:
+      do_compare_and_jump (op0, op1, LTGT, LTGT, if_false_label, if_true_label,
+			   prob);
+      break;
+
+    case TRUTH_ANDIF_EXPR:
+      if (if_false_label == NULL_RTX)
+        {
+	  drop_through_label = gen_label_rtx ();
+	  do_jump (op0, drop_through_label, NULL_RTX, prob);
+	  do_jump (op1, NULL_RTX, if_true_label, prob);
+	}
+      else
+	{
+	  do_jump (op0, if_false_label, NULL_RTX, prob);
+	  do_jump (op1, if_false_label, if_true_label, prob);
+	}
+      break;
+
+    case TRUTH_ORIF_EXPR:
+      if (if_true_label == NULL_RTX)
+	{
+          drop_through_label = gen_label_rtx ();
+	  do_jump (op0, NULL_RTX, drop_through_label, prob);
+	  do_jump (op1, if_false_label, NULL_RTX, prob);
+	}
+      else
+	{
+	  do_jump (op0, NULL_RTX, if_true_label, prob);
+	  do_jump (op1, if_false_label, if_true_label, prob);
+	}
+      break;
+
+    default:
+      gcc_unreachable ();
+    }
+
+  if (drop_through_label)
+    {
+      do_pending_stack_adjust ();
+      emit_label (drop_through_label);
+    }
 }
 
 /* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
@@ -151,23 +358,17 @@ prefer_and_bit_test (enum machine_mode mode, int bitnum)
    actually perform a jump.  An example where there is no jump
    is when EXP is `(foo (), 0)' and IF_FALSE_LABEL is null.
 
-   This function is responsible for optimizing cases such as
-   &&, || and comparison operators in EXP.  */
+   PROB is probability of jump to if_true_label, or -1 if unknown.  */
 
 void
-do_jump (tree exp, rtx if_false_label, rtx if_true_label)
+do_jump (tree exp, rtx if_false_label, rtx if_true_label, int prob)
 {
   enum tree_code code = TREE_CODE (exp);
-  /* Some cases need to create a label to jump to
-     in order to properly fall through.
-     These cases set DROP_THROUGH_LABEL nonzero.  */
-  rtx drop_through_label = 0;
   rtx temp;
   int i;
   tree type;
   enum machine_mode mode;
-
-  emit_queue ();
+  rtx drop_through_label = 0;
 
   switch (code)
     {
@@ -189,12 +390,6 @@ do_jump (tree exp, rtx if_false_label, rtx if_true_label)
       break;
 #endif
 
-    case UNSAVE_EXPR:
-      do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
-      TREE_OPERAND (exp, 0)
-	= lang_hooks.unsave_expr_now (TREE_OPERAND (exp, 0));
-      break;
-
     case NOP_EXPR:
       if (TREE_CODE (TREE_OPERAND (exp, 0)) == COMPONENT_REF
           || TREE_CODE (TREE_OPERAND (exp, 0)) == BIT_FIELD_REF
@@ -208,113 +403,42 @@ do_jump (tree exp, rtx if_false_label, rtx if_true_label)
            < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp, 0)))))
         goto normal;
     case NON_LVALUE_EXPR:
-    case REFERENCE_EXPR:
     case ABS_EXPR:
     case NEGATE_EXPR:
     case LROTATE_EXPR:
     case RROTATE_EXPR:
       /* These cannot change zero->nonzero or vice versa.  */
-      do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
+      do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label, prob);
       break;
 
-#if 0
-      /* This is never less insns than evaluating the PLUS_EXPR followed by
-         a test and can be longer if the test is eliminated.  */
-    case PLUS_EXPR:
-      /* Reduce to minus.  */
-      exp = build (MINUS_EXPR, TREE_TYPE (exp),
-                   TREE_OPERAND (exp, 0),
-                   fold (build1 (NEGATE_EXPR, TREE_TYPE (TREE_OPERAND (exp, 1)),
-                                 TREE_OPERAND (exp, 1))));
-      /* Process as MINUS.  */
-#endif
-
-    case MINUS_EXPR:
-      /* Nonzero iff operands of minus differ.  */
-      do_compare_and_jump (build (NE_EXPR, TREE_TYPE (exp),
-                                  TREE_OPERAND (exp, 0),
-                                  TREE_OPERAND (exp, 1)),
-                           NE, NE, if_false_label, if_true_label);
-      break;
-
-    case BIT_AND_EXPR:
-      /* fold_single_bit_test() converts (X & (1 << C)) into (X >> C) & 1.
-	 See if the former is preferred for jump tests and restore it
-	 if so.  */
-      if (TREE_CODE (TREE_OPERAND (exp, 0)) == RSHIFT_EXPR
-	  && integer_onep (TREE_OPERAND (exp, 1)))
-	{
-	  tree arg = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
-	  tree shift = TREE_OPERAND (TREE_OPERAND (exp, 0), 1);
-	  tree one = TREE_OPERAND (exp, 1);
-	  tree argtype = TREE_TYPE (arg);
-	  if (TREE_CODE (shift) == INTEGER_CST
-	      && compare_tree_int (shift, 0) > 0
-	      && compare_tree_int (shift, HOST_BITS_PER_WIDE_INT) < 0
-	      && prefer_and_bit_test (TYPE_MODE (argtype),
-				      TREE_INT_CST_LOW (shift)))
-	    {
-	      do_jump (build (BIT_AND_EXPR, argtype, arg,
-			      fold (build (LSHIFT_EXPR, argtype, one, shift))),
-		       if_false_label, if_true_label);
-	      break;
-	    }
-	}
-
-      /* If we are AND'ing with a small constant, do this comparison in the
-         smallest type that fits.  If the machine doesn't have comparisons
-         that small, it will be converted back to the wider comparison.
-         This helps if we are testing the sign bit of a narrower object.
-         combine can't do this for us because it can't know whether a
-         ZERO_EXTRACT or a compare in a smaller mode exists, but we do.  */
-
-      if (! SLOW_BYTE_ACCESS
-          && TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
-          && TYPE_PRECISION (TREE_TYPE (exp)) <= HOST_BITS_PER_WIDE_INT
-          && (i = tree_floor_log2 (TREE_OPERAND (exp, 1))) >= 0
-          && (mode = mode_for_size (i + 1, MODE_INT, 0)) != BLKmode
-          && (type = lang_hooks.types.type_for_mode (mode, 1)) != 0
-          && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (exp))
-          && (cmp_optab->handlers[(int) TYPE_MODE (type)].insn_code
-              != CODE_FOR_nothing))
-        {
-          do_jump (convert (type, exp), if_false_label, if_true_label);
-          break;
-        }
-      goto normal;
-
     case TRUTH_NOT_EXPR:
-      do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label);
+      do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label,
+	       inv (prob));
       break;
 
-    case TRUTH_ANDIF_EXPR:
-      if (if_false_label == 0)
-        if_false_label = drop_through_label = gen_label_rtx ();
-      do_jump (TREE_OPERAND (exp, 0), if_false_label, NULL_RTX);
-      start_cleanup_deferral ();
-      do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
-      end_cleanup_deferral ();
-      break;
+    case COND_EXPR:
+      {
+	rtx label1 = gen_label_rtx ();
+	if (!if_true_label || !if_false_label)
+	  {
+	    drop_through_label = gen_label_rtx ();
+	    if (!if_true_label)
+	      if_true_label = drop_through_label;
+	    if (!if_false_label)
+	      if_false_label = drop_through_label;
+	  }
 
-    case TRUTH_ORIF_EXPR:
-      if (if_true_label == 0)
-        if_true_label = drop_through_label = gen_label_rtx ();
-      do_jump (TREE_OPERAND (exp, 0), NULL_RTX, if_true_label);
-      start_cleanup_deferral ();
-      do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
-      end_cleanup_deferral ();
-      break;
+        do_pending_stack_adjust ();
+	do_jump (TREE_OPERAND (exp, 0), label1, NULL_RTX, -1);
+	do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label, prob);
+        emit_label (label1);
+	do_jump (TREE_OPERAND (exp, 2), if_false_label, if_true_label, prob);
+	break;
+      }
 
     case COMPOUND_EXPR:
-      push_temp_slots ();
-      expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0);
-      preserve_temp_slots (NULL_RTX);
-      free_temp_slots ();
-      pop_temp_slots ();
-      emit_queue ();
-      do_pending_stack_adjust ();
-      do_jump (TREE_OPERAND (exp, 1), if_false_label, if_true_label);
-      break;
+      /* Lowered by gimplify.c.  */
+      gcc_unreachable ();
 
     case COMPONENT_REF:
     case BIT_FIELD_REF:
@@ -331,359 +455,185 @@ do_jump (tree exp, rtx if_false_label, rtx if_true_label)
         /* Get description of this reference.  We don't actually care
            about the underlying object here.  */
         get_inner_reference (exp, &bitsize, &bitpos, &offset, &mode,
-                             &unsignedp, &volatilep);
+                             &unsignedp, &volatilep, false);
 
         type = lang_hooks.types.type_for_size (bitsize, unsignedp);
         if (! SLOW_BYTE_ACCESS
             && type != 0 && bitsize >= 0
             && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (exp))
-            && (cmp_optab->handlers[(int) TYPE_MODE (type)].insn_code
-          != CODE_FOR_nothing))
+            && have_insn_for (COMPARE, TYPE_MODE (type)))
           {
-            do_jump (convert (type, exp), if_false_label, if_true_label);
+	    do_jump (fold_convert (type, exp), if_false_label, if_true_label,
+		     prob);
             break;
           }
         goto normal;
       }
 
-    case COND_EXPR:
-      /* Do (a ? 1 : 0) and (a ? 0 : 1) as special cases.  */
-      if (integer_onep (TREE_OPERAND (exp, 1))
-          && integer_zerop (TREE_OPERAND (exp, 2)))
-        do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
-
-      else if (integer_zerop (TREE_OPERAND (exp, 1))
-               && integer_onep (TREE_OPERAND (exp, 2)))
-        do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label);
-
-      else
-      {
-        rtx label1 = gen_label_rtx ();
-        drop_through_label = gen_label_rtx ();
-
-        do_jump (TREE_OPERAND (exp, 0), label1, NULL_RTX);
-
-        start_cleanup_deferral ();
-        /* Now the THEN-expression.  */
-        do_jump (TREE_OPERAND (exp, 1),
-                 if_false_label ? if_false_label : drop_through_label,
-                 if_true_label ? if_true_label : drop_through_label);
-        /* In case the do_jump just above never jumps.  */
-        do_pending_stack_adjust ();
-        emit_label (label1);
-
-        /* Now the ELSE-expression.  */
-        do_jump (TREE_OPERAND (exp, 2),
-           if_false_label ? if_false_label : drop_through_label,
-           if_true_label ? if_true_label : drop_through_label);
-        end_cleanup_deferral ();
-      }
-      break;
+    case MINUS_EXPR:
+      /* Nonzero iff operands of minus differ.  */
+      code = NE_EXPR;
 
+      /* FALLTHRU */
     case EQ_EXPR:
-      {
-        tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
-
-        if (GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_COMPLEX_FLOAT
-            || GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_COMPLEX_INT)
-          {
-            tree exp0 = save_expr (TREE_OPERAND (exp, 0));
-            tree exp1 = save_expr (TREE_OPERAND (exp, 1));
-            do_jump
-              (fold
-               (build (TRUTH_ANDIF_EXPR, TREE_TYPE (exp),
-                 fold (build (EQ_EXPR, TREE_TYPE (exp),
-                  fold (build1 (REALPART_EXPR,
-                    TREE_TYPE (inner_type),
-                    exp0)),
-                  fold (build1 (REALPART_EXPR,
-                    TREE_TYPE (inner_type),
-                    exp1)))),
-                 fold (build (EQ_EXPR, TREE_TYPE (exp),
-                  fold (build1 (IMAGPART_EXPR,
-                    TREE_TYPE (inner_type),
-                    exp0)),
-                  fold (build1 (IMAGPART_EXPR,
-                    TREE_TYPE (inner_type),
-                    exp1)))))),
-               if_false_label, if_true_label);
-          }
-
-        else if (integer_zerop (TREE_OPERAND (exp, 1)))
-          do_jump (TREE_OPERAND (exp, 0), if_true_label, if_false_label);
-
-        else if (GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_INT
-                 && !can_compare_p (EQ, TYPE_MODE (inner_type), ccp_jump))
-          do_jump_by_parts_equality (exp, if_false_label, if_true_label);
-        else
-          do_compare_and_jump (exp, EQ, EQ, if_false_label, if_true_label);
-        break;
-      }
-
     case NE_EXPR:
-      {
-        tree inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
-
-        if (GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_COMPLEX_FLOAT
-            || GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_COMPLEX_INT)
-          {
-            tree exp0 = save_expr (TREE_OPERAND (exp, 0));
-            tree exp1 = save_expr (TREE_OPERAND (exp, 1));
-            do_jump
-              (fold
-               (build (TRUTH_ORIF_EXPR, TREE_TYPE (exp),
-                 fold (build (NE_EXPR, TREE_TYPE (exp),
-                  fold (build1 (REALPART_EXPR,
-                    TREE_TYPE (inner_type),
-                    exp0)),
-                  fold (build1 (REALPART_EXPR,
-                    TREE_TYPE (inner_type),
-                    exp1)))),
-                 fold (build (NE_EXPR, TREE_TYPE (exp),
-                    fold (build1 (IMAGPART_EXPR,
-                      TREE_TYPE (inner_type),
-                      exp0)),
-                    fold (build1 (IMAGPART_EXPR,
-                      TREE_TYPE (inner_type),
-                      exp1)))))),
-               if_false_label, if_true_label);
-          }
-
-        else if (integer_zerop (TREE_OPERAND (exp, 1)))
-          do_jump (TREE_OPERAND (exp, 0), if_false_label, if_true_label);
-
-        else if (GET_MODE_CLASS (TYPE_MODE (inner_type)) == MODE_INT
-           && !can_compare_p (NE, TYPE_MODE (inner_type), ccp_jump))
-          do_jump_by_parts_equality (exp, if_true_label, if_false_label);
-        else
-          do_compare_and_jump (exp, NE, NE, if_false_label, if_true_label);
-        break;
-      }
-
     case LT_EXPR:
-      mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
-      if (GET_MODE_CLASS (mode) == MODE_INT
-          && ! can_compare_p (LT, mode, ccp_jump))
-        do_jump_by_parts_greater (exp, 1, if_false_label, if_true_label);
-      else
-        do_compare_and_jump (exp, LT, LTU, if_false_label, if_true_label);
-      break;
-
     case LE_EXPR:
-      mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
-      if (GET_MODE_CLASS (mode) == MODE_INT
-          && ! can_compare_p (LE, mode, ccp_jump))
-        do_jump_by_parts_greater (exp, 0, if_true_label, if_false_label);
-      else
-        do_compare_and_jump (exp, LE, LEU, if_false_label, if_true_label);
-      break;
-
     case GT_EXPR:
-      mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
-      if (GET_MODE_CLASS (mode) == MODE_INT
-          && ! can_compare_p (GT, mode, ccp_jump))
-        do_jump_by_parts_greater (exp, 0, if_false_label, if_true_label);
-      else
-        do_compare_and_jump (exp, GT, GTU, if_false_label, if_true_label);
-      break;
-
     case GE_EXPR:
-      mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
-      if (GET_MODE_CLASS (mode) == MODE_INT
-          && ! can_compare_p (GE, mode, ccp_jump))
-        do_jump_by_parts_greater (exp, 1, if_true_label, if_false_label);
-      else
-        do_compare_and_jump (exp, GE, GEU, if_false_label, if_true_label);
+    case ORDERED_EXPR:
+    case UNORDERED_EXPR:
+    case UNLT_EXPR:
+    case UNLE_EXPR:
+    case UNGT_EXPR:
+    case UNGE_EXPR:
+    case UNEQ_EXPR:
+    case LTGT_EXPR:
+    case TRUTH_ANDIF_EXPR:
+    case TRUTH_ORIF_EXPR:
+    other_code:
+      do_jump_1 (code, TREE_OPERAND (exp, 0), TREE_OPERAND (exp, 1),
+		 if_false_label, if_true_label, prob);
       break;
 
-    case UNORDERED_EXPR:
-    case ORDERED_EXPR:
-      {
-        enum rtx_code cmp, rcmp;
-        int do_rev;
+    case BIT_AND_EXPR:
+      /* fold_single_bit_test() converts (X & (1 << C)) into (X >> C) & 1.
+	 See if the former is preferred for jump tests and restore it
+	 if so.  */
+      if (integer_onep (TREE_OPERAND (exp, 1)))
+	{
+	  tree exp0 = TREE_OPERAND (exp, 0);
+	  rtx set_label, clr_label;
+	  int setclr_prob = prob;
+
+	  /* Strip narrowing integral type conversions.  */
+	  while (CONVERT_EXPR_P (exp0)
+		 && TREE_OPERAND (exp0, 0) != error_mark_node
+		 && TYPE_PRECISION (TREE_TYPE (exp0))
+		    <= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp0, 0))))
+	    exp0 = TREE_OPERAND (exp0, 0);
+
+	  /* "exp0 ^ 1" inverts the sense of the single bit test.  */
+	  if (TREE_CODE (exp0) == BIT_XOR_EXPR
+	      && integer_onep (TREE_OPERAND (exp0, 1)))
+	    {
+	      exp0 = TREE_OPERAND (exp0, 0);
+	      clr_label = if_true_label;
+	      set_label = if_false_label;
+	      setclr_prob = inv (prob);
+	    }
+	  else
+	    {
+	      clr_label = if_false_label;
+	      set_label = if_true_label;
+	    }
 
-        if (code == UNORDERED_EXPR)
-          cmp = UNORDERED, rcmp = ORDERED;
-        else
-          cmp = ORDERED, rcmp = UNORDERED;
-        mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
-
-        do_rev = 0;
-        if (! can_compare_p (cmp, mode, ccp_jump)
-            && (can_compare_p (rcmp, mode, ccp_jump)
-          /* If the target doesn't provide either UNORDERED or ORDERED
-             comparisons, canonicalize on UNORDERED for the library.  */
-          || rcmp == UNORDERED))
-          do_rev = 1;
-
-        if (! do_rev)
-          do_compare_and_jump (exp, cmp, cmp, if_false_label, if_true_label);
-        else
-          do_compare_and_jump (exp, rcmp, rcmp, if_true_label, if_false_label);
-      }
-      break;
+	  if (TREE_CODE (exp0) == RSHIFT_EXPR)
+	    {
+	      tree arg = TREE_OPERAND (exp0, 0);
+	      tree shift = TREE_OPERAND (exp0, 1);
+	      tree argtype = TREE_TYPE (arg);
+	      if (TREE_CODE (shift) == INTEGER_CST
+		  && compare_tree_int (shift, 0) >= 0
+		  && compare_tree_int (shift, HOST_BITS_PER_WIDE_INT) < 0
+		  && prefer_and_bit_test (TYPE_MODE (argtype),
+					  TREE_INT_CST_LOW (shift)))
+		{
+		  unsigned HOST_WIDE_INT mask
+		    = (unsigned HOST_WIDE_INT) 1 << TREE_INT_CST_LOW (shift);
+		  do_jump (build2 (BIT_AND_EXPR, argtype, arg,
+				   build_int_cstu (argtype, mask)),
+			   clr_label, set_label, setclr_prob);
+		  break;
+		}
+	    }
+	}
 
-    {
-      enum rtx_code rcode1;
-      enum tree_code tcode2;
-
-      case UNLT_EXPR:
-        rcode1 = UNLT;
-        tcode2 = LT_EXPR;
-        goto unordered_bcc;
-      case UNLE_EXPR:
-        rcode1 = UNLE;
-        tcode2 = LE_EXPR;
-        goto unordered_bcc;
-      case UNGT_EXPR:
-        rcode1 = UNGT;
-        tcode2 = GT_EXPR;
-        goto unordered_bcc;
-      case UNGE_EXPR:
-        rcode1 = UNGE;
-        tcode2 = GE_EXPR;
-        goto unordered_bcc;
-      case UNEQ_EXPR:
-        rcode1 = UNEQ;
-        tcode2 = EQ_EXPR;
-        goto unordered_bcc;
-
-      unordered_bcc:
-        mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
-        if (can_compare_p (rcode1, mode, ccp_jump))
-          do_compare_and_jump (exp, rcode1, rcode1, if_false_label,
-                               if_true_label);
-        else
-          {
-            tree op0 = save_expr (TREE_OPERAND (exp, 0));
-            tree op1 = save_expr (TREE_OPERAND (exp, 1));
-            tree cmp0, cmp1;
-
-            /* If the target doesn't support combined unordered
-               compares, decompose into UNORDERED + comparison.  */
-            cmp0 = fold (build (UNORDERED_EXPR, TREE_TYPE (exp), op0, op1));
-            cmp1 = fold (build (tcode2, TREE_TYPE (exp), op0, op1));
-            exp = build (TRUTH_ORIF_EXPR, TREE_TYPE (exp), cmp0, cmp1);
-            do_jump (exp, if_false_label, if_true_label);
-          }
-      }
-      break;
+      /* If we are AND'ing with a small constant, do this comparison in the
+         smallest type that fits.  If the machine doesn't have comparisons
+         that small, it will be converted back to the wider comparison.
+         This helps if we are testing the sign bit of a narrower object.
+         combine can't do this for us because it can't know whether a
+         ZERO_EXTRACT or a compare in a smaller mode exists, but we do.  */
 
-      /* Special case:
-          __builtin_expect (<test>, 0)	and
-          __builtin_expect (<test>, 1)
+      if (! SLOW_BYTE_ACCESS
+          && TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
+          && TYPE_PRECISION (TREE_TYPE (exp)) <= HOST_BITS_PER_WIDE_INT
+          && (i = tree_floor_log2 (TREE_OPERAND (exp, 1))) >= 0
+          && (mode = mode_for_size (i + 1, MODE_INT, 0)) != BLKmode
+          && (type = lang_hooks.types.type_for_mode (mode, 1)) != 0
+          && TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (exp))
+          && have_insn_for (COMPARE, TYPE_MODE (type)))
+        {
+	  do_jump (fold_convert (type, exp), if_false_label, if_true_label,
+		   prob);
+          break;
+        }
 
-         We need to do this here, so that <test> is not converted to a SCC
-         operation on machines that use condition code registers and COMPARE
-         like the PowerPC, and then the jump is done based on whether the SCC
-         operation produced a 1 or 0.  */
-    case CALL_EXPR:
-      /* Check for a built-in function.  */
-      {
-	tree fndecl = get_callee_fndecl (exp);
-	tree arglist = TREE_OPERAND (exp, 1);
-
-	if (fndecl
-	    && DECL_BUILT_IN (fndecl)
-	    && DECL_FUNCTION_CODE (fndecl) == BUILT_IN_EXPECT
-	    && arglist != NULL_TREE
-	    && TREE_CHAIN (arglist) != NULL_TREE)
-	  {
-	    rtx seq = expand_builtin_expect_jump (exp, if_false_label,
-						  if_true_label);
-
-	    if (seq != NULL_RTX)
-	      {
-		emit_insn (seq);
-		return;
-	      }
-	  }
-      }
-      /* Fall through and generate the normal code.  */
+      if (TYPE_PRECISION (TREE_TYPE (exp)) > 1
+	  || TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST)
+	goto normal;
+
+      /* Boolean comparisons can be compiled as TRUTH_AND_EXPR.  */
+
+    case TRUTH_AND_EXPR:
+      /* High branch cost, expand as the bitwise AND of the conditions.
+	 Do the same if the RHS has side effects, because we're effectively
+	 turning a TRUTH_AND_EXPR into a TRUTH_ANDIF_EXPR.  */
+      if (BRANCH_COST (optimize_insn_for_speed_p (),
+		       false) >= 4
+	  || TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 1)))
+	goto normal;
+      code = TRUTH_ANDIF_EXPR;
+      goto other_code;
+
+    case BIT_IOR_EXPR:
+    case TRUTH_OR_EXPR:
+      /* High branch cost, expand as the bitwise OR of the conditions.
+	 Do the same if the RHS has side effects, because we're effectively
+	 turning a TRUTH_OR_EXPR into a TRUTH_ORIF_EXPR.  */
+      if (BRANCH_COST (optimize_insn_for_speed_p (), false) >= 4
+	  || TREE_SIDE_EFFECTS (TREE_OPERAND (exp, 1)))
+	goto normal;
+      code = TRUTH_ORIF_EXPR;
+      goto other_code;
 
+      /* Fall through and generate the normal code.  */
     default:
     normal:
-      temp = expand_expr (exp, NULL_RTX, VOIDmode, 0);
-#if 0
-      /* This is not needed any more and causes poor code since it causes
-         comparisons and tests from non-SI objects to have different code
-         sequences.  */
-      /* Copy to register to avoid generating bad insns by cse
-         from (set (mem ...) (arithop))  (set (cc0) (mem ...)).  */
-      if (!cse_not_expected && GET_CODE (temp) == MEM)
-        temp = copy_to_reg (temp);
-#endif
+      temp = expand_normal (exp);
       do_pending_stack_adjust ();
-      /* Do any postincrements in the expression that was tested.  */
-      emit_queue ();
-
-      if (GET_CODE (temp) == CONST_INT
-          || (GET_CODE (temp) == CONST_DOUBLE && GET_MODE (temp) == VOIDmode)
-          || GET_CODE (temp) == LABEL_REF)
-        {
-          rtx target = temp == const0_rtx ? if_false_label : if_true_label;
-          if (target)
-            emit_jump (target);
-        }
-      else if (GET_MODE_CLASS (GET_MODE (temp)) == MODE_INT
-               && ! can_compare_p (NE, GET_MODE (temp), ccp_jump))
-        /* Note swapping the labels gives us not-equal.  */
-        do_jump_by_parts_equality_rtx (temp, if_true_label, if_false_label);
-      else if (GET_MODE (temp) != VOIDmode)
+      /* The RTL optimizers prefer comparisons against pseudos.  */
+      if (GET_CODE (temp) == SUBREG)
 	{
-	  /* The RTL optimizers prefer comparisons against pseudos.  */
-	  if (GET_CODE (temp) == SUBREG)
-	    {
-	      /* Compare promoted variables in their promoted mode.  */
-	      if (SUBREG_PROMOTED_VAR_P (temp)
-		  && GET_CODE (XEXP (temp, 0)) == REG)
-		temp = XEXP (temp, 0);
-	      else
-		temp = copy_to_reg (temp);
-	    }
-	  do_compare_rtx_and_jump (temp, CONST0_RTX (GET_MODE (temp)),
-				   NE, TREE_UNSIGNED (TREE_TYPE (exp)),
-				   GET_MODE (temp), NULL_RTX,
-				   if_false_label, if_true_label);
+	  /* Compare promoted variables in their promoted mode.  */
+	  if (SUBREG_PROMOTED_VAR_P (temp)
+	      && REG_P (XEXP (temp, 0)))
+	    temp = XEXP (temp, 0);
+	  else
+	    temp = copy_to_reg (temp);
 	}
-      else
-        abort ();
+      do_compare_rtx_and_jump (temp, CONST0_RTX (GET_MODE (temp)),
+			       NE, TYPE_UNSIGNED (TREE_TYPE (exp)),
+			       GET_MODE (temp), NULL_RTX,
+			       if_false_label, if_true_label, prob);
     }
 
   if (drop_through_label)
     {
-      /* If do_jump produces code that might be jumped around,
-         do any stack adjusts from that code, before the place
-         where control merges in.  */
       do_pending_stack_adjust ();
       emit_label (drop_through_label);
     }
 }
 
-/* Given a comparison expression EXP for values too wide to be compared
-   with one insn, test the comparison and jump to the appropriate label.
-   The code of EXP is ignored; we always test GT if SWAP is 0,
-   and LT if SWAP is 1.  */
-
-static void
-do_jump_by_parts_greater (tree exp, int swap, rtx if_false_label,
-			  rtx if_true_label)
-{
-  rtx op0 = expand_expr (TREE_OPERAND (exp, swap), NULL_RTX, VOIDmode, 0);
-  rtx op1 = expand_expr (TREE_OPERAND (exp, !swap), NULL_RTX, VOIDmode, 0);
-  enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
-  int unsignedp = TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0)));
-
-  do_jump_by_parts_greater_rtx (mode, unsignedp, op0, op1, if_false_label, if_true_label);
-}
-
 /* Compare OP0 with OP1, word at a time, in mode MODE.
    UNSIGNEDP says to do unsigned comparison.
    Jump to IF_TRUE_LABEL if OP0 is greater, IF_FALSE_LABEL otherwise.  */
 
-void
+static void
 do_jump_by_parts_greater_rtx (enum machine_mode mode, int unsignedp, rtx op0,
-			      rtx op1, rtx if_false_label, rtx if_true_label)
+			      rtx op1, rtx if_false_label, rtx if_true_label,
+			      int prob)
 {
   int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD);
   rtx drop_through_label = 0;
@@ -715,11 +665,12 @@ do_jump_by_parts_greater_rtx (enum machine_mode mode, int unsignedp, rtx op0,
       /* All but high-order word must be compared as unsigned.  */
       do_compare_rtx_and_jump (op0_word, op1_word, GT,
                                (unsignedp || i > 0), word_mode, NULL_RTX,
-                               NULL_RTX, if_true_label);
+			       NULL_RTX, if_true_label, prob);
 
       /* Consider lower words only if these are equal.  */
       do_compare_rtx_and_jump (op0_word, op1_word, NE, unsignedp, word_mode,
-                               NULL_RTX, NULL_RTX, if_false_label);
+			       NULL_RTX, NULL_RTX, if_false_label,
+			       inv (prob));
     }
 
   if (if_false_label)
@@ -728,42 +679,34 @@ do_jump_by_parts_greater_rtx (enum machine_mode mode, int unsignedp, rtx op0,
     emit_label (drop_through_label);
 }
 
-/* Given an EQ_EXPR expression EXP for values too wide to be compared
-   with one insn, test the comparison and jump to the appropriate label.  */
+/* Given a comparison expression EXP for values too wide to be compared
+   with one insn, test the comparison and jump to the appropriate label.
+   The code of EXP is ignored; we always test GT if SWAP is 0,
+   and LT if SWAP is 1.  */
 
 static void
-do_jump_by_parts_equality (tree exp, rtx if_false_label, rtx if_true_label)
+do_jump_by_parts_greater (tree treeop0, tree treeop1, int swap,
+			  rtx if_false_label, rtx if_true_label, int prob)
 {
-  rtx op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
-  rtx op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
-  enum machine_mode mode = TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0)));
-  int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD);
-  int i;
-  rtx drop_through_label = 0;
-
-  if (! if_false_label)
-    drop_through_label = if_false_label = gen_label_rtx ();
+  rtx op0 = expand_normal (swap ? treeop1 : treeop0);
+  rtx op1 = expand_normal (swap ? treeop0 : treeop1);
+  enum machine_mode mode = TYPE_MODE (TREE_TYPE (treeop0));
+  int unsignedp = TYPE_UNSIGNED (TREE_TYPE (treeop0));
 
-  for (i = 0; i < nwords; i++)
-    do_compare_rtx_and_jump (operand_subword_force (op0, i, mode),
-                             operand_subword_force (op1, i, mode),
-                             EQ, TREE_UNSIGNED (TREE_TYPE (exp)),
-                             word_mode, NULL_RTX, if_false_label, NULL_RTX);
-
-  if (if_true_label)
-    emit_jump (if_true_label);
-  if (drop_through_label)
-    emit_label (drop_through_label);
+  do_jump_by_parts_greater_rtx (mode, unsignedp, op0, op1, if_false_label,
+				if_true_label, prob);
 }
 
-/* Jump according to whether OP0 is 0.
-   We assume that OP0 has an integer mode that is too wide
-   for the available compare insns.  */
+/* Jump according to whether OP0 is 0.  We assume that OP0 has an integer
+   mode, MODE, that is too wide for the available compare insns.  Either
+   Either (but not both) of IF_TRUE_LABEL and IF_FALSE_LABEL may be NULL_RTX
+   to indicate drop through.  */
 
-void
-do_jump_by_parts_equality_rtx (rtx op0, rtx if_false_label, rtx if_true_label)
+static void
+do_jump_by_parts_zero_rtx (enum machine_mode mode, rtx op0,
+			   rtx if_false_label, rtx if_true_label, int prob)
 {
-  int nwords = GET_MODE_SIZE (GET_MODE (op0)) / UNITS_PER_WORD;
+  int nwords = GET_MODE_SIZE (mode) / UNITS_PER_WORD;
   rtx part;
   int i;
   rtx drop_through_label = 0;
@@ -774,17 +717,16 @@ do_jump_by_parts_equality_rtx (rtx op0, rtx if_false_label, rtx if_true_label)
      be slower, but that's highly unlikely.  */
 
   part = gen_reg_rtx (word_mode);
-  emit_move_insn (part, operand_subword_force (op0, 0, GET_MODE (op0)));
+  emit_move_insn (part, operand_subword_force (op0, 0, mode));
   for (i = 1; i < nwords && part != 0; i++)
     part = expand_binop (word_mode, ior_optab, part,
-                         operand_subword_force (op0, i, GET_MODE (op0)),
+                         operand_subword_force (op0, i, mode),
                          part, 1, OPTAB_WIDEN);
 
   if (part != 0)
     {
       do_compare_rtx_and_jump (part, const0_rtx, EQ, 1, word_mode,
-                               NULL_RTX, if_false_label, if_true_label);
-
+			       NULL_RTX, if_false_label, if_true_label, prob);
       return;
     }
 
@@ -793,9 +735,9 @@ do_jump_by_parts_equality_rtx (rtx op0, rtx if_false_label, rtx if_true_label)
     drop_through_label = if_false_label = gen_label_rtx ();
 
   for (i = 0; i < nwords; i++)
-    do_compare_rtx_and_jump (operand_subword_force (op0, i, GET_MODE (op0)),
+    do_compare_rtx_and_jump (operand_subword_force (op0, i, mode),
                              const0_rtx, EQ, 1, word_mode, NULL_RTX,
-                             if_false_label, NULL_RTX);
+			     if_false_label, NULL_RTX, prob);
 
   if (if_true_label)
     emit_jump (if_true_label);
@@ -803,79 +745,139 @@ do_jump_by_parts_equality_rtx (rtx op0, rtx if_false_label, rtx if_true_label)
   if (drop_through_label)
     emit_label (drop_through_label);
 }
-
-/* Generate code for a comparison of OP0 and OP1 with rtx code CODE.
-   (including code to compute the values to be compared)
-   and set (CC0) according to the result.
-   The decision as to signed or unsigned comparison must be made by the caller.
 
-   We force a stack adjustment unless there are currently
-   things pushed on the stack that aren't yet used.
+/* Test for the equality of two RTX expressions OP0 and OP1 in mode MODE,
+   where MODE is an integer mode too wide to be compared with one insn.
+   Either (but not both) of IF_TRUE_LABEL and IF_FALSE_LABEL may be NULL_RTX
+   to indicate drop through.  */
 
-   If MODE is BLKmode, SIZE is an RTX giving the size of the objects being
-   compared.  */
-
-rtx
-compare_from_rtx (rtx op0, rtx op1, enum rtx_code code, int unsignedp,
-		  enum machine_mode mode, rtx size)
+static void
+do_jump_by_parts_equality_rtx (enum machine_mode mode, rtx op0, rtx op1,
+			       rtx if_false_label, rtx if_true_label, int prob)
 {
-  enum rtx_code ucode;
-  rtx tem;
-
-  /* If one operand is constant, make it the second one.  Only do this
-     if the other operand is not constant as well.  */
+  int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD);
+  rtx drop_through_label = 0;
+  int i;
 
-  if (swap_commutative_operands_p (op0, op1))
+  if (op1 == const0_rtx)
     {
-      tem = op0;
-      op0 = op1;
-      op1 = tem;
-      code = swap_condition (code);
+      do_jump_by_parts_zero_rtx (mode, op0, if_false_label, if_true_label,
+				 prob);
+      return;
     }
-
-  if (flag_force_mem)
+  else if (op0 == const0_rtx)
     {
-      op0 = force_not_mem (op0);
-      op1 = force_not_mem (op1);
+      do_jump_by_parts_zero_rtx (mode, op1, if_false_label, if_true_label,
+				 prob);
+      return;
     }
 
-  do_pending_stack_adjust ();
+  if (! if_false_label)
+    drop_through_label = if_false_label = gen_label_rtx ();
 
-  ucode = unsignedp ? unsigned_condition (code) : code;
-  tem = simplify_const_relational_operation (ucode, mode, op0, op1);
-  if (tem != 0)
-    return tem;
+  for (i = 0; i < nwords; i++)
+    do_compare_rtx_and_jump (operand_subword_force (op0, i, mode),
+                             operand_subword_force (op1, i, mode),
+                             EQ, 0, word_mode, NULL_RTX,
+			     if_false_label, NULL_RTX, prob);
 
-#if 0
-  /* There's no need to do this now that combine.c can eliminate lots of
-     sign extensions.  This can be less efficient in certain cases on other
-     machines.  */
-
-  /* If this is a signed equality comparison, we can do it as an
-     unsigned comparison since zero-extension is cheaper than sign
-     extension and comparisons with zero are done as unsigned.  This is
-     the case even on machines that can do fast sign extension, since
-     zero-extension is easier to combine with other operations than
-     sign-extension is.  If we are comparing against a constant, we must
-     convert it to what it would look like unsigned.  */
-  if ((code == EQ || code == NE) && ! unsignedp
-      && GET_MODE_BITSIZE (GET_MODE (op0)) <= HOST_BITS_PER_WIDE_INT)
-    {
-      if (GET_CODE (op1) == CONST_INT
-          && (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0))) != INTVAL (op1))
-        op1 = GEN_INT (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0)));
-      unsignedp = 1;
-    }
-#endif
+  if (if_true_label)
+    emit_jump (if_true_label);
+  if (drop_through_label)
+    emit_label (drop_through_label);
+}
 
-  emit_cmp_insn (op0, op1, code, size, mode, unsignedp);
+/* Given an EQ_EXPR expression EXP for values too wide to be compared
+   with one insn, test the comparison and jump to the appropriate label.  */
 
-#if HAVE_cc0
-  return gen_rtx_fmt_ee (code, VOIDmode, cc0_rtx, const0_rtx);
-#else
-  return gen_rtx_fmt_ee (code, VOIDmode, op0, op1);
-#endif
+static void
+do_jump_by_parts_equality (tree treeop0, tree treeop1, rtx if_false_label,
+			   rtx if_true_label, int prob)
+{
+  rtx op0 = expand_normal (treeop0);
+  rtx op1 = expand_normal (treeop1);
+  enum machine_mode mode = TYPE_MODE (TREE_TYPE (treeop0));
+  do_jump_by_parts_equality_rtx (mode, op0, op1, if_false_label,
+				 if_true_label, prob);
 }
+
+/* Split a comparison into two others, the second of which has the other
+   "orderedness".  The first is always ORDERED or UNORDERED if MODE
+   does not honor NaNs (which means that it can be skipped in that case;
+   see do_compare_rtx_and_jump).
+
+   The two conditions are written in *CODE1 and *CODE2.  Return true if
+   the conditions must be ANDed, false if they must be ORed.  */
+
+bool
+split_comparison (enum rtx_code code, enum machine_mode mode,
+		  enum rtx_code *code1, enum rtx_code *code2)
+{
+  switch (code)
+    {
+    case LT:
+      *code1 = ORDERED;
+      *code2 = UNLT;
+      return true;
+    case LE:
+      *code1 = ORDERED;
+      *code2 = UNLE;
+      return true;
+    case GT:
+      *code1 = ORDERED;
+      *code2 = UNGT;
+      return true;
+    case GE:
+      *code1 = ORDERED;
+      *code2 = UNGE;
+      return true;
+    case EQ:
+      *code1 = ORDERED;
+      *code2 = UNEQ;
+      return true;
+    case NE:
+      *code1 = UNORDERED;
+      *code2 = LTGT;
+      return false;
+    case UNLT:
+      *code1 = UNORDERED;
+      *code2 = LT;
+      return false;
+    case UNLE:
+      *code1 = UNORDERED;
+      *code2 = LE;
+      return false;
+    case UNGT:
+      *code1 = UNORDERED;
+      *code2 = GT;
+      return false;
+    case UNGE:
+      *code1 = UNORDERED;
+      *code2 = GE;
+      return false;
+    case UNEQ:
+      *code1 = UNORDERED;
+      *code2 = EQ;
+      return false;
+    case LTGT:
+      /* Do not turn a trapping comparison into a non-trapping one.  */
+      if (HONOR_SNANS (mode))
+	{
+          *code1 = LT;
+          *code2 = GT;
+          return false;
+	}
+      else
+	{
+	  *code1 = ORDERED;
+	  *code2 = NE;
+	  return true;
+	}
+    default:
+      gcc_unreachable ();
+    }
+}
+
 
 /* Like do_compare_and_jump but expects the values to compare as two rtx's.
    The decision as to signed or unsigned comparison must be made by the caller.
@@ -886,19 +888,38 @@ compare_from_rtx (rtx op0, rtx op1, enum rtx_code code, int unsignedp,
 void
 do_compare_rtx_and_jump (rtx op0, rtx op1, enum rtx_code code, int unsignedp,
 			 enum machine_mode mode, rtx size, rtx if_false_label,
-			 rtx if_true_label)
+			 rtx if_true_label, int prob)
 {
-  enum rtx_code ucode;
   rtx tem;
-  int dummy_true_label = 0;
+  rtx dummy_label = NULL_RTX;
+  rtx last;
 
   /* Reverse the comparison if that is safe and we want to jump if it is
-     false.  */
-  if (! if_true_label && ! FLOAT_MODE_P (mode))
+     false.  Also convert to the reverse comparison if the target can
+     implement it.  */
+  if ((! if_true_label
+       || ! can_compare_p (code, mode, ccp_jump))
+      && (! FLOAT_MODE_P (mode)
+	  || code == ORDERED || code == UNORDERED
+	  || (! HONOR_NANS (mode) && (code == LTGT || code == UNEQ))
+	  || (! HONOR_SNANS (mode) && (code == EQ || code == NE))))
     {
-      if_true_label = if_false_label;
-      if_false_label = 0;
-      code = reverse_condition (code);
+      enum rtx_code rcode;
+      if (FLOAT_MODE_P (mode))
+        rcode = reverse_condition_maybe_unordered (code);
+      else
+        rcode = reverse_condition (code);
+
+      /* Canonicalize to UNORDERED for the libcall.  */
+      if (can_compare_p (rcode, mode, ccp_jump)
+	  || (code == ORDERED && ! can_compare_p (ORDERED, mode, ccp_jump)))
+	{
+          tem = if_true_label;
+          if_true_label = if_false_label;
+          if_false_label = tem;
+	  code = rcode;
+	  prob = inv (prob);
+	}
     }
 
   /* If one operand is constant, make it the second one.  Only do this
@@ -912,66 +933,181 @@ do_compare_rtx_and_jump (rtx op0, rtx op1, enum rtx_code code, int unsignedp,
       code = swap_condition (code);
     }
 
-  if (flag_force_mem)
-    {
-      op0 = force_not_mem (op0);
-      op1 = force_not_mem (op1);
-    }
-
   do_pending_stack_adjust ();
 
-  ucode = unsignedp ? unsigned_condition (code) : code;
-  tem = simplify_const_relational_operation (ucode, mode, op0, op1);
-  if (tem != 0)
+  code = unsignedp ? unsigned_condition (code) : code;
+  if (0 != (tem = simplify_relational_operation (code, mode, VOIDmode,
+						 op0, op1)))
     {
-      if (tem == const_true_rtx)
-        {
-          if (if_true_label)
-            emit_jump (if_true_label);
-        }
-      else
-        {
-          if (if_false_label)
-            emit_jump (if_false_label);
-        }
-      return;
-    }
+      if (CONSTANT_P (tem))
+	{
+	  rtx label = (tem == const0_rtx || tem == CONST0_RTX (mode))
+		      ? if_false_label : if_true_label;
+	  if (label)
+	    emit_jump (label);
+	  return;
+	}
 
-#if 0
-  /* There's no need to do this now that combine.c can eliminate lots of
-     sign extensions.  This can be less efficient in certain cases on other
-     machines.  */
-
-  /* If this is a signed equality comparison, we can do it as an
-     unsigned comparison since zero-extension is cheaper than sign
-     extension and comparisons with zero are done as unsigned.  This is
-     the case even on machines that can do fast sign extension, since
-     zero-extension is easier to combine with other operations than
-     sign-extension is.  If we are comparing against a constant, we must
-     convert it to what it would look like unsigned.  */
-  if ((code == EQ || code == NE) && ! unsignedp
-      && GET_MODE_BITSIZE (GET_MODE (op0)) <= HOST_BITS_PER_WIDE_INT)
-    {
-      if (GET_CODE (op1) == CONST_INT
-          && (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0))) != INTVAL (op1))
-        op1 = GEN_INT (INTVAL (op1) & GET_MODE_MASK (GET_MODE (op0)));
-      unsignedp = 1;
+      code = GET_CODE (tem);
+      mode = GET_MODE (tem);
+      op0 = XEXP (tem, 0);
+      op1 = XEXP (tem, 1);
+      unsignedp = (code == GTU || code == LTU || code == GEU || code == LEU);
     }
-#endif
 
   if (! if_true_label)
+    dummy_label = if_true_label = gen_label_rtx ();
+
+  if (GET_MODE_CLASS (mode) == MODE_INT
+      && ! can_compare_p (code, mode, ccp_jump))
     {
-      dummy_true_label = 1;
-      if_true_label = gen_label_rtx ();
+      switch (code)
+	{
+	case LTU:
+	  do_jump_by_parts_greater_rtx (mode, 1, op1, op0,
+					if_false_label, if_true_label, prob);
+	  break;
+
+	case LEU:
+	  do_jump_by_parts_greater_rtx (mode, 1, op0, op1,
+					if_true_label, if_false_label,
+					inv (prob));
+	  break;
+
+	case GTU:
+	  do_jump_by_parts_greater_rtx (mode, 1, op0, op1,
+					if_false_label, if_true_label, prob);
+	  break;
+
+	case GEU:
+	  do_jump_by_parts_greater_rtx (mode, 1, op1, op0,
+					if_true_label, if_false_label,
+					inv (prob));
+	  break;
+
+	case LT:
+	  do_jump_by_parts_greater_rtx (mode, 0, op1, op0,
+					if_false_label, if_true_label, prob);
+	  break;
+
+	case LE:
+	  do_jump_by_parts_greater_rtx (mode, 0, op0, op1,
+					if_true_label, if_false_label,
+					inv (prob));
+	  break;
+
+	case GT:
+	  do_jump_by_parts_greater_rtx (mode, 0, op0, op1,
+					if_false_label, if_true_label, prob);
+	  break;
+
+	case GE:
+	  do_jump_by_parts_greater_rtx (mode, 0, op1, op0,
+					if_true_label, if_false_label,
+					inv (prob));
+	  break;
+
+	case EQ:
+	  do_jump_by_parts_equality_rtx (mode, op0, op1, if_false_label,
+					 if_true_label, prob);
+	  break;
+
+	case NE:
+	  do_jump_by_parts_equality_rtx (mode, op0, op1, if_true_label,
+					 if_false_label, inv (prob));
+	  break;
+
+	default:
+	  gcc_unreachable ();
+	}
     }
+  else
+    {
+      if (GET_MODE_CLASS (mode) == MODE_FLOAT
+	  && ! can_compare_p (code, mode, ccp_jump)
+	  && can_compare_p (swap_condition (code), mode, ccp_jump))
+	{
+	  rtx tmp;
+	  code = swap_condition (code);
+	  tmp = op0;
+	  op0 = op1;
+	  op1 = tmp;
+	}
+
+      else if (GET_MODE_CLASS (mode) == MODE_FLOAT
+	       && ! can_compare_p (code, mode, ccp_jump)
+
+	       /* Never split ORDERED and UNORDERED.  These must be implemented.  */
+	       && (code != ORDERED && code != UNORDERED)
+
+               /* Split a floating-point comparison if we can jump on other
+	          conditions...  */
+	       && (have_insn_for (COMPARE, mode)
+
+	           /* ... or if there is no libcall for it.  */
+	           || code_to_optab[code] == NULL))
+        {
+	  enum rtx_code first_code;
+	  bool and_them = split_comparison (code, mode, &first_code, &code);
+
+	  /* If there are no NaNs, the first comparison should always fall
+	     through.  */
+	  if (!HONOR_NANS (mode))
+	    gcc_assert (first_code == (and_them ? ORDERED : UNORDERED));
 
-  emit_cmp_and_jump_insns (op0, op1, code, size, mode, unsignedp,
-                           if_true_label);
+	  else
+	    {
+	      if (and_them)
+		{
+		  rtx dest_label;
+		  /* If we only jump if true, just bypass the second jump.  */
+		  if (! if_false_label)
+		    {
+		      if (! dummy_label)
+		        dummy_label = gen_label_rtx ();
+		      dest_label = dummy_label;
+		    }
+		  else
+		    dest_label = if_false_label;
+                  do_compare_rtx_and_jump (op0, op1, first_code, unsignedp, mode,
+					   size, dest_label, NULL_RTX, prob);
+		}
+              else
+                do_compare_rtx_and_jump (op0, op1, first_code, unsignedp, mode,
+					 size, NULL_RTX, if_true_label, prob);
+	    }
+	}
+
+      last = get_last_insn ();
+      emit_cmp_and_jump_insns (op0, op1, code, size, mode, unsignedp,
+			       if_true_label);
+      if (prob != -1 && profile_status != PROFILE_ABSENT)
+	{
+	  for (last = NEXT_INSN (last);
+	       last && NEXT_INSN (last);
+	       last = NEXT_INSN (last))
+	    if (JUMP_P (last))
+	      break;
+	  if (!last
+	      || !JUMP_P (last)
+	      || NEXT_INSN (last)
+	      || !any_condjump_p (last))
+	    {
+	      if (dump_file)
+		fprintf (dump_file, "Failed to add probability note\n");
+	    }
+	  else
+	    {
+	      gcc_assert (!find_reg_note (last, REG_BR_PROB, 0));
+	      add_reg_note (last, REG_BR_PROB, GEN_INT (prob));
+	    }
+	}
+    }
 
   if (if_false_label)
     emit_jump (if_false_label);
-  if (dummy_true_label)
-    emit_label (if_true_label);
+  if (dummy_label)
+    emit_label (dummy_label);
 }
 
 /* Generate code for a comparison expression EXP (including code to compute
@@ -985,9 +1121,9 @@ do_compare_rtx_and_jump (rtx op0, rtx op1, enum rtx_code code, int unsignedp,
    things pushed on the stack that aren't yet used.  */
 
 static void
-do_compare_and_jump (tree exp, enum rtx_code signed_code,
+do_compare_and_jump (tree treeop0, tree treeop1, enum rtx_code signed_code,
 		     enum rtx_code unsigned_code, rtx if_false_label,
-		     rtx if_true_label)
+		     rtx if_true_label, int prob)
 {
   rtx op0, op1;
   tree type;
@@ -996,63 +1132,58 @@ do_compare_and_jump (tree exp, enum rtx_code signed_code,
   enum rtx_code code;
 
   /* Don't crash if the comparison was erroneous.  */
-  op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0);
-  if (TREE_CODE (TREE_OPERAND (exp, 0)) == ERROR_MARK)
+  op0 = expand_normal (treeop0);
+  if (TREE_CODE (treeop0) == ERROR_MARK)
     return;
 
-  op1 = expand_expr (TREE_OPERAND (exp, 1), NULL_RTX, VOIDmode, 0);
-  if (TREE_CODE (TREE_OPERAND (exp, 1)) == ERROR_MARK)
+  op1 = expand_normal (treeop1);
+  if (TREE_CODE (treeop1) == ERROR_MARK)
     return;
 
-  type = TREE_TYPE (TREE_OPERAND (exp, 0));
+  type = TREE_TYPE (treeop0);
   mode = TYPE_MODE (type);
-  if (TREE_CODE (TREE_OPERAND (exp, 0)) == INTEGER_CST
-      && (TREE_CODE (TREE_OPERAND (exp, 1)) != INTEGER_CST
+  if (TREE_CODE (treeop0) == INTEGER_CST
+      && (TREE_CODE (treeop1) != INTEGER_CST
           || (GET_MODE_BITSIZE (mode)
-              > GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp,
-                                                                      1)))))))
+              > GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (treeop1))))))
     {
       /* op0 might have been replaced by promoted constant, in which
          case the type of second argument should be used.  */
-      type = TREE_TYPE (TREE_OPERAND (exp, 1));
+      type = TREE_TYPE (treeop1);
       mode = TYPE_MODE (type);
     }
-  unsignedp = TREE_UNSIGNED (type);
+  unsignedp = TYPE_UNSIGNED (type);
   code = unsignedp ? unsigned_code : signed_code;
 
 #ifdef HAVE_canonicalize_funcptr_for_compare
   /* If function pointers need to be "canonicalized" before they can
-     be reliably compared, then canonicalize them.  */
+     be reliably compared, then canonicalize them.
+     Only do this if *both* sides of the comparison are function pointers.
+     If one side isn't, we want a noncanonicalized comparison.  See PR
+     middle-end/17564.  */
   if (HAVE_canonicalize_funcptr_for_compare
-      && TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == POINTER_TYPE
-      && (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0))))
-          == FUNCTION_TYPE))
+      && TREE_CODE (TREE_TYPE (treeop0)) == POINTER_TYPE
+      && TREE_CODE (TREE_TYPE (TREE_TYPE (treeop0)))
+          == FUNCTION_TYPE
+      && TREE_CODE (TREE_TYPE (treeop1)) == POINTER_TYPE
+      && TREE_CODE (TREE_TYPE (TREE_TYPE (treeop1)))
+          == FUNCTION_TYPE)
     {
       rtx new_op0 = gen_reg_rtx (mode);
+      rtx new_op1 = gen_reg_rtx (mode);
 
       emit_insn (gen_canonicalize_funcptr_for_compare (new_op0, op0));
       op0 = new_op0;
-    }
-
-  if (HAVE_canonicalize_funcptr_for_compare
-      && TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 1))) == POINTER_TYPE
-      && (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 1))))
-          == FUNCTION_TYPE))
-    {
-      rtx new_op1 = gen_reg_rtx (mode);
 
       emit_insn (gen_canonicalize_funcptr_for_compare (new_op1, op1));
       op1 = new_op1;
     }
 #endif
 
-  /* Do any postincrements in the expression that was tested.  */
-  emit_queue ();
-
   do_compare_rtx_and_jump (op0, op1, code, unsignedp, mode,
                            ((mode == BLKmode)
-                            ? expr_size (TREE_OPERAND (exp, 0)) : NULL_RTX),
-                           if_false_label, if_true_label);
+                            ? expr_size (treeop0) : NULL_RTX),
+			   if_false_label, if_true_label, prob);
 }
 
 #include "gt-dojump.h"