* predict.c: Reformatting and minor cleanups.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@48269 138bc75d-0d04-0410-961f-82ee72b054a4

2 files changed, 171 insertions, 161 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9f1b924f2ae..baef9d71a65 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,7 @@
 Sat Dec 22 08:59:50 2001  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
 
+	* predict.c: Reformatting and minor cleanups.
+
 	* expr.c (expand_expr, case ADDR_EXPR): Handling taking address of
 	SAVE_EXPR.
 	* function.c (gen_mem_addressof): Add missing tests for SAVE_EXPR.
diff --git a/gcc/predict.c b/gcc/predict.c
index 44142c0380a..35a6af233da 100644
--- a/gcc/predict.c
+++ b/gcc/predict.c
@@ -1,22 +1,22 @@
 /* Branch prediction routines for the GNU compiler.
    Copyright (C) 2000, 2001 Free Software Foundation, Inc.
 
-   This file is part of GCC.
+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 version.
+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
+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.
+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 COPYING.  If not, write to the Free
-   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+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.  */
 
 /* References:
 
@@ -25,9 +25,7 @@
    [2] "Static Branch Frequency and Program Profile Analysis"
        Wu and Larus; MICRO-27.
    [3] "Corpus-based Static Branch Prediction"
-       Calder, Grunwald, Lindsay, Martin, Mozer, and Zorn; PLDI '95.
-
-*/
+       Calder, Grunwald, Lindsay, Martin, Mozer, and Zorn; PLDI '95.   */
 
 
 #include "config.h"
@@ -67,6 +65,7 @@ static void counts_to_freqs		 PARAMS ((void));
 
 /* Information we hold about each branch predictor.
    Filled using information from predict.def.  */
+
 struct predictor_info
 {
   const char *const name;	/* Name used in the debugging dumps.  */
@@ -81,10 +80,10 @@ struct predictor_info
 
 /* Recompute hitrate in percent to our representation.  */
 
-#define HITRATE(VAL) ((int)((VAL) * REG_BR_PROB_BASE + 50) / 100)
+#define HITRATE(VAL) ((int) ((VAL) * REG_BR_PROB_BASE + 50) / 100)
 
 #define DEF_PREDICTOR(ENUM, NAME, HITRATE, FLAGS) {NAME, HITRATE, FLAGS},
-static const struct predictor_info predictor_info[] = {
+static const struct predictor_info predictor_info[]= {
 #include "predict.def"
 
   /* Upper bound on predictors.  */
@@ -100,6 +99,7 @@ predict_insn (insn, predictor, probability)
 {
   if (!any_condjump_p (insn))
     abort ();
+
   REG_NOTES (insn)
     = gen_rtx_EXPR_LIST (REG_BR_PRED,
 			 gen_rtx_CONCAT (VOIDmode,
@@ -109,6 +109,7 @@ predict_insn (insn, predictor, probability)
 }
 
 /* Predict insn by given predictor.  */
+
 void
 predict_insn_def (insn, predictor, taken)
      rtx insn;
@@ -116,12 +117,15 @@ predict_insn_def (insn, predictor, taken)
      enum prediction taken;
 {
    int probability = predictor_info[(int) predictor].hitrate;
+
    if (taken != TAKEN)
      probability = REG_BR_PROB_BASE - probability;
+
    predict_insn (insn, predictor, probability);
 }
 
 /* Predict edge E with given probability if possible.  */
+
 void
 predict_edge (e, predictor, probability)
      edge e;
@@ -144,6 +148,7 @@ predict_edge (e, predictor, probability)
 }
 
 /* Predict edge E by given predictor if possible.  */
+
 void
 predict_edge_def (e, predictor, taken)
      edge e;
@@ -154,29 +159,29 @@ predict_edge_def (e, predictor, taken)
 
    if (taken != TAKEN)
      probability = REG_BR_PROB_BASE - probability;
+
    predict_edge (e, predictor, probability);
 }
 
 /* Invert all branch predictions or probability notes in the INSN.  This needs
    to be done each time we invert the condition used by the jump.  */
+
 void
 invert_br_probabilities (insn)
      rtx insn;
 {
-  rtx note = REG_NOTES (insn);
-
-  while (note)
-    {
-      if (REG_NOTE_KIND (note) == REG_BR_PROB)
-	XEXP (note, 0) = GEN_INT (REG_BR_PROB_BASE - INTVAL (XEXP (note, 0)));
-      else if (REG_NOTE_KIND (note) == REG_BR_PRED)
-	XEXP (XEXP (note, 0), 1)
-	  = GEN_INT (REG_BR_PROB_BASE - INTVAL (XEXP (XEXP (note, 0), 1)));
-      note = XEXP (note, 1);
-    }
+  rtx note;
+
+  for (note = REG_NOTES (insn); note; note = XEXP (note, 1))
+    if (REG_NOTE_KIND (note) == REG_BR_PROB)
+      XEXP (note, 0) = GEN_INT (REG_BR_PROB_BASE - INTVAL (XEXP (note, 0)));
+    else if (REG_NOTE_KIND (note) == REG_BR_PRED)
+      XEXP (XEXP (note, 0), 1)
+	= GEN_INT (REG_BR_PROB_BASE - INTVAL (XEXP (XEXP (note, 0), 1)));
 }
 
 /* Dump information about the branch prediction to the output file.  */
+
 static void
 dump_prediction (predictor, probability, bb, used)
      enum br_predictor predictor;
@@ -194,25 +199,23 @@ dump_prediction (predictor, probability, bb, used)
 
   fprintf (rtl_dump_file, "  %s heuristics%s: %.1f%%",
 	   predictor_info[predictor].name,
-	   used ? "" : " (ignored)",
-	   probability * 100.0 / REG_BR_PROB_BASE);
+	   used ? "" : " (ignored)", probability * 100.0 / REG_BR_PROB_BASE);
 
   if (bb->count)
     {
       fprintf (rtl_dump_file, "  exec ");
-      fprintf (rtl_dump_file, HOST_WIDEST_INT_PRINT_DEC,
-	       (HOST_WIDEST_INT) bb->count);
+      fprintf (rtl_dump_file, HOST_WIDEST_INT_PRINT_DEC, bb->count);
       fprintf (rtl_dump_file, " hit ");
-      fprintf (rtl_dump_file, HOST_WIDEST_INT_PRINT_DEC,
-	       (HOST_WIDEST_INT) e->count);
-      fprintf (rtl_dump_file, " (%.1f%%)",
-	       e->count * 100.0 / bb->count);
+      fprintf (rtl_dump_file, HOST_WIDEST_INT_PRINT_DEC, e->count);
+      fprintf (rtl_dump_file, " (%.1f%%)", e->count * 100.0 / bb->count);
     }
+
   fprintf (rtl_dump_file, "\n");
 }
 
 /* Combine all REG_BR_PRED notes into single probability and attach REG_BR_PROB
    note if not already present.  Remove now useless REG_BR_PRED notes.  */
+
 static void
 combine_predictions_for_insn (insn, bb)
      rtx insn;
@@ -220,7 +223,7 @@ combine_predictions_for_insn (insn, bb)
 {
   rtx prob_note = find_reg_note (insn, REG_BR_PROB, 0);
   rtx *pnote = &REG_NOTES (insn);
-  rtx note = REG_NOTES (insn);
+  rtx note;
   int best_probability = PROB_EVEN;
   int best_predictor = END_PREDICTORS;
   int combined_probability = REG_BR_PROB_BASE / 2;
@@ -235,29 +238,27 @@ combine_predictions_for_insn (insn, bb)
   /* We implement "first match" heuristics and use probability guessed
      by predictor with smallest index.  In the future we will use better
      probability combination techniques.  */
-  while (note)
-    {
-      if (REG_NOTE_KIND (note) == REG_BR_PRED)
-	{
-	  int predictor = INTVAL (XEXP (XEXP (note, 0), 0));
-	  int probability = INTVAL (XEXP (XEXP (note, 0), 1));
-
-	  found = true;
-	  if (best_predictor > predictor)
-	    best_probability = probability, best_predictor = predictor;
-
-	  d = (combined_probability * probability
-	       + (REG_BR_PROB_BASE - combined_probability)
-	       * (REG_BR_PROB_BASE - probability));
-	  /* An FP math to avoid overflows of 32bit integers.  */
-	  combined_probability = (((double)combined_probability) * probability
-				  * REG_BR_PROB_BASE / d + 0.5);
-	}
-      note = XEXP (note, 1);
-    }
-
-  /* Decide heuristic to use.  In case we didn't match anything, use
-     no_prediction heuristic, in case we did match, use either
+  for (note = REG_NOTES (insn); note; note = XEXP (note, 1))
+    if (REG_NOTE_KIND (note) == REG_BR_PRED)
+      {
+	int predictor = INTVAL (XEXP (XEXP (note, 0), 0));
+	int probability = INTVAL (XEXP (XEXP (note, 0), 1));
+
+	found = true;
+	if (best_predictor > predictor)
+	  best_probability = probability, best_predictor = predictor;
+
+	d = (combined_probability * probability
+	     + (REG_BR_PROB_BASE - combined_probability)
+	     * (REG_BR_PROB_BASE - probability));
+
+	/* Use FP math to avoid overflows of 32bit integers.  */
+	combined_probability = (((double) combined_probability) * probability
+				* REG_BR_PROB_BASE / d + 0.5);
+      }
+
+  /* Decide which heuristic to use.  In case we didn't match anything,
+     use no_prediction heuristic, in case we did match, use either
      first match or Dempster-Shaffer theory depending on the flags.  */
 
   if (predictor_info [best_predictor].flags & PRED_FLAG_FIRST_MATCH)
@@ -267,8 +268,7 @@ combine_predictions_for_insn (insn, bb)
     dump_prediction (PRED_NO_PREDICTION, combined_probability, bb, true);
   else
     {
-      dump_prediction (PRED_DS_THEORY, combined_probability, bb,
-		       !first_match);
+      dump_prediction (PRED_DS_THEORY, combined_probability, bb, !first_match);
       dump_prediction (PRED_FIRST_MATCH, best_probability, bb, first_match);
     }
 
@@ -290,17 +290,20 @@ combine_predictions_for_insn (insn, bb)
       else
         pnote = &XEXP (*pnote, 1);
     }
+
   if (!prob_note)
     {
       REG_NOTES (insn)
 	= gen_rtx_EXPR_LIST (REG_BR_PROB,
 			     GEN_INT (combined_probability), REG_NOTES (insn));
+
       /* Save the prediction into CFG in case we are seeing non-degenerated
 	 conditional jump.  */
       if (bb->succ->succ_next)
 	{
 	  BRANCH_EDGE (bb)->probability = combined_probability;
-	  FALLTHRU_EDGE (bb)->probability = REG_BR_PROB_BASE - combined_probability;
+	  FALLTHRU_EDGE (bb)->probability
+	    = REG_BR_PROB_BASE - combined_probability;
 	}
     }
 }
@@ -335,37 +338,34 @@ estimate_probability (loops_info)
       flow_loop_scan (loops_info, loop, LOOP_EXIT_EDGES);
       exits = loop->num_exits;
 
-      for (j = loop->first->index;
-	   j <= loop->last->index;
-	   ++j)
-	{
-	  if (TEST_BIT (loop->nodes, j))
-	    {
-	      int header_found = 0;
-	      edge e;
-
-	      /* Loop branch heuristics - predict as taken an edge back to
-	         a loop's head.  */
+      for (j = loop->first->index; j <= loop->last->index; ++j)
+	if (TEST_BIT (loop->nodes, j))
+	  {
+	    int header_found = 0;
+	    edge e;
+
+	    /* Loop branch heuristics - predict an edge back to a
+	       loop's head as taken.  */
+	    for (e = BASIC_BLOCK(j)->succ; e; e = e->succ_next)
+	      if (e->dest == loop->header
+		  && e->src == loop->latch)
+		{
+		  header_found = 1;
+		  predict_edge_def (e, PRED_LOOP_BRANCH, TAKEN);
+		}
+
+	    /* Loop exit heuristics - predict an edge exiting the loop if the
+	       conditinal has no loop header successors as not taken.  */
+	    if (!header_found)
 	      for (e = BASIC_BLOCK(j)->succ; e; e = e->succ_next)
-		if (e->dest == loop->header
-		    && e->src == loop->latch)
-		  {
-		    header_found = 1;
-		    predict_edge_def (e, PRED_LOOP_BRANCH, TAKEN);
-		  }
-	      /* Loop exit heuristics - predict as not taken an edge
-	         exiting the loop if the conditinal has no loop header
-	         successors.  */
-	      if (!header_found)
-		for (e = BASIC_BLOCK(j)->succ; e; e = e->succ_next)
-		  if (e->dest->index < 0
-		      || !TEST_BIT (loop->nodes, e->dest->index))
-		    predict_edge (e, PRED_LOOP_EXIT,
-				  (REG_BR_PROB_BASE
-				   - predictor_info [(int)PRED_LOOP_EXIT].hitrate)
-				  / exits);
-	    }
-	}
+		if (e->dest->index < 0
+		    || !TEST_BIT (loop->nodes, e->dest->index))
+		  predict_edge
+		    (e, PRED_LOOP_EXIT,
+		     (REG_BR_PROB_BASE
+		      - predictor_info [(int)PRED_LOOP_EXIT].hitrate)
+		     / exits);
+	  }
     }
 
   /* Attempt to predict conditional jumps using a number of heuristics.  */
@@ -376,30 +376,27 @@ estimate_probability (loops_info)
       rtx cond, earliest;
       edge e;
 
-      /* If block has no successor, predict all possible paths to
-         it as improbable, as the block contains a call to a noreturn
-	 function and thus can be executed only once.  */
+      /* If block has no successor, predict all possible paths to it as
+         improbable, as the block contains a call to a noreturn function and
+         thus can be executed only once.  */
       if (bb->succ == NULL && !found_noreturn)
 	{
 	  int y;
 
 	  /* ??? Postdominator claims each noreturn block to be postdominated
 	     by each, so we need to run only once.  This needs to be changed
-	     once postdominace algorithm is updated to say something more sane.
-	     */
+	     once postdominace algorithm is updated to say something more
+	     sane. */
 	  found_noreturn = 1;
 	  for (y = 0; y < n_basic_blocks; y++)
 	    if (!TEST_BIT (post_dominators[y], i))
-	      {
-		for (e = BASIC_BLOCK (y)->succ; e; e = e->succ_next)
+	      for (e = BASIC_BLOCK (y)->succ; e; e = e->succ_next)
 		if (e->dest->index >= 0
 		    && TEST_BIT (post_dominators[e->dest->index], i))
 		  predict_edge_def (e, PRED_NORETURN, NOT_TAKEN);
-	      }
 	}
 
-      if (GET_CODE (last_insn) != JUMP_INSN
-	  || ! any_condjump_p (last_insn))
+      if (GET_CODE (last_insn) != JUMP_INSN || ! any_condjump_p (last_insn))
 	continue;
 
       for (e = bb->succ; e; e = e->succ_next)
@@ -413,12 +410,12 @@ estimate_probability (loops_info)
 
 	  /* Look for block we are guarding (ie we dominate it,
 	     but it doesn't postdominate us).  */
-	  if (e->dest != EXIT_BLOCK_PTR
-	      && e->dest != bb
+	  if (e->dest != EXIT_BLOCK_PTR && e->dest != bb
 	      && TEST_BIT (dominators[e->dest->index], e->src->index)
 	      && !TEST_BIT (post_dominators[e->src->index], e->dest->index))
 	    {
 	      rtx insn;
+
 	      /* The call heuristic claims that a guarded function call
 		 is improbable.  This is because such calls are often used
 		 to signal exceptional situations such as printing error
@@ -446,18 +443,14 @@ estimate_probability (loops_info)
       if (GET_RTX_CLASS (GET_CODE (cond)) == '<'
 	  && ((REG_P (XEXP (cond, 0)) && REG_POINTER (XEXP (cond, 0)))
 	      || (REG_P (XEXP (cond, 1)) && REG_POINTER (XEXP (cond, 1)))))
-	switch (GET_CODE (cond))
-	  {
-	  case EQ:
+	{
+	  if (GET_CODE (cond) == EQ)
 	    predict_insn_def (last_insn, PRED_POINTER, NOT_TAKEN);
-	    break;
-	  case NE:
+	  else if (GET_CODE (cond) == NE)
 	    predict_insn_def (last_insn, PRED_POINTER, TAKEN);
-	    break;
-	  default:
-	    break;
-	  }
+	}
       else
+
       /* Try "opcode heuristic."
 	 EQ tests are usually false and NE tests are usually true. Also,
 	 most quantities are positive, so we can make the appropriate guesses
@@ -479,11 +472,13 @@ estimate_probability (loops_info)
 	      ;
 	    /* Comparisons with 0 are often used for booleans and there is
 	       nothing usefull to predict about them.  */
-	    else if (XEXP (cond, 1) == const0_rtx || XEXP (cond, 0) == const0_rtx)
+	    else if (XEXP (cond, 1) == const0_rtx
+		     || XEXP (cond, 0) == const0_rtx)
 	      ;
 	    else
 	      predict_insn_def (last_insn, PRED_OPCODE_NONEQUAL, NOT_TAKEN);
 	    break;
+
 	  case NE:
 	  case LTGT:
 	    /* Floating point comparisons appears to behave in a very
@@ -493,23 +488,28 @@ estimate_probability (loops_info)
 	      ;
 	    /* Comparisons with 0 are often used for booleans and there is
 	       nothing usefull to predict about them.  */
-	    else if (XEXP (cond, 1) == const0_rtx || XEXP (cond, 0) == const0_rtx)
+	    else if (XEXP (cond, 1) == const0_rtx
+		     || XEXP (cond, 0) == const0_rtx)
 	      ;
 	    else
 	      predict_insn_def (last_insn, PRED_OPCODE_NONEQUAL, TAKEN);
 	    break;
+
 	  case ORDERED:
 	    predict_insn_def (last_insn, PRED_FPOPCODE, TAKEN);
 	    break;
+
 	  case UNORDERED:
 	    predict_insn_def (last_insn, PRED_FPOPCODE, NOT_TAKEN);
 	    break;
+
 	  case LE:
 	  case LT:
 	    if (XEXP (cond, 1) == const0_rtx || XEXP (cond, 1) == const1_rtx
 		|| XEXP (cond, 1) == constm1_rtx)
 	      predict_insn_def (last_insn, PRED_OPCODE_POSITIVE, NOT_TAKEN);
 	    break;
+
 	  case GE:
 	  case GT:
 	    if (XEXP (cond, 1) == const0_rtx || XEXP (cond, 1) == const1_rtx
@@ -524,23 +524,19 @@ estimate_probability (loops_info)
 
   /* Attach the combined probability to each conditional jump.  */
   for (i = 0; i < n_basic_blocks; i++)
-    {
-      rtx last_insn = BLOCK_END (i);
+    if (GET_CODE (BLOCK_END (i)) == JUMP_INSN
+	&& any_condjump_p (BLOCK_END (i)))
+      combine_predictions_for_insn (BLOCK_END (i), BASIC_BLOCK (i));
 
-      if (GET_CODE (last_insn) != JUMP_INSN
-	  || ! any_condjump_p (last_insn))
-	continue;
-      combine_predictions_for_insn (last_insn, BASIC_BLOCK (i));
-    }
   sbitmap_vector_free (post_dominators);
   sbitmap_vector_free (dominators);
 
   estimate_bb_frequencies (loops_info);
 }
 
-/* __builtin_expect dropped tokens into the insn stream describing
-   expected values of registers.  Generate branch probabilities
-   based off these values.  */
+/* __builtin_expect dropped tokens into the insn stream describing expected
+   values of registers.  Generate branch probabilities based off these
+   values.  */
 
 void
 expected_value_to_br_prob ()
@@ -566,20 +562,19 @@ expected_value_to_br_prob ()
 	  ev = NULL_RTX;
 	  continue;
 
-	default:
-	  /* Look for insns that clobber the EV register.  */
-	  if (ev && reg_set_p (ev_reg, insn))
-	    ev = NULL_RTX;
-	  continue;
-
 	case JUMP_INSN:
 	  /* Look for simple conditional branches.  If we haven't got an
 	     expected value yet, no point going further.  */
-	  if (GET_CODE (insn) != JUMP_INSN || ev == NULL_RTX)
-	    continue;
-	  if (! any_condjump_p (insn))
+	  if (GET_CODE (insn) != JUMP_INSN || ev == NULL_RTX
+	      || ! any_condjump_p (insn))
 	    continue;
 	  break;
+
+	default:
+	  /* Look for insns that clobber the EV register.  */
+	  if (ev && reg_set_p (ev_reg, insn))
+	    ev = NULL_RTX;
+	  continue;
 	}
 
       /* Collect the branch condition, hopefully relative to EV_REG.  */
@@ -593,8 +588,7 @@ expected_value_to_br_prob ()
 	 Could use cselib to try and reduce this further.  */
       cond = XEXP (SET_SRC (pc_set (insn)), 0);
       cond = canonicalize_condition (insn, cond, 0, NULL, ev_reg);
-      if (! cond
-	  || XEXP (cond, 0) != ev_reg
+      if (! cond || XEXP (cond, 0) != ev_reg
 	  || GET_CODE (XEXP (cond, 1)) != CONST_INT)
 	continue;
 
@@ -650,6 +644,7 @@ typedef struct edge_info_def
 
 /* Helper function for estimate_bb_frequencies.
    Propagate the frequencies for loops headed by HEAD.  */
+
 static void
 propagate_freq (head)
      basic_block head;
@@ -668,6 +663,7 @@ propagate_freq (head)
       if (BLOCK_INFO (bb)->tovisit)
 	{
 	  int count = 0;
+
 	  for (e = bb->pred; e; e = e->pred_next)
 	    if (BLOCK_INFO (e->src)->tovisit && !(e->flags & EDGE_DFS_BACK))
 	      count++;
@@ -683,7 +679,7 @@ propagate_freq (head)
   BLOCK_INFO (head)->frequency = 1;
   for (; bb; bb = nextbb)
     {
-      volatile double cyclic_probability = 0, frequency = 0;
+      double cyclic_probability = 0, frequency = 0;
 
       nextbb = BLOCK_INFO (bb)->next;
       BLOCK_INFO (bb)->next = NULL;
@@ -716,9 +712,9 @@ propagate_freq (head)
       /* Compute back edge frequencies.  */
       for (e = bb->succ; e; e = e->succ_next)
 	if (e->dest == head)
-	  EDGE_INFO (e)->back_edge_prob = (e->probability
-					   * BLOCK_INFO (bb)->frequency
-					   / REG_BR_PROB_BASE);
+	  EDGE_INFO (e)->back_edge_prob
+	    = ((e->probability * BLOCK_INFO (bb)->frequency)
+	       / REG_BR_PROB_BASE);
 
       /* Propagate to successor blocks.  */
       for (e = bb->succ; e; e = e->succ_next)
@@ -732,6 +728,7 @@ propagate_freq (head)
 		  nextbb = e->dest;
 		else
 		  BLOCK_INFO (last)->next = e->dest;
+
 		last = e->dest;
 	      }
 	   }
@@ -739,6 +736,7 @@ propagate_freq (head)
 }
 
 /* Estimate probabilities of loopback edges in loops at same nest level.  */
+
 static void
 estimate_loops_at_level (first_loop)
      struct loop *first_loop;
@@ -753,7 +751,8 @@ estimate_loops_at_level (first_loop)
       estimate_loops_at_level (loop->inner);
 
       /* Find current loop back edge and mark it.  */
-      for (e = loop->latch->succ; e->dest != loop->header; e = e->succ_next);
+      for (e = loop->latch->succ; e->dest != loop->header; e = e->succ_next)
+	;
 
       EDGE_INFO (e)->back_edge = 1;
 
@@ -764,6 +763,7 @@ estimate_loops_at_level (first_loop)
 	  for (l = loop->next; l; l = l->next)
 	    if (l->header == loop->header)
 	      break;
+
 	  if (l)
 	    continue;
 	}
@@ -774,11 +774,13 @@ estimate_loops_at_level (first_loop)
 	  EXECUTE_IF_SET_IN_SBITMAP (l->nodes, 0, n,
 				     BLOCK_INFO (BASIC_BLOCK (n))->tovisit = 1
 				     );
+
       propagate_freq (loop->header);
     }
 }
 
 /* Convert counts measured by profile driven feedback to frequencies.  */
+
 static void
 counts_to_freqs ()
 {
@@ -786,28 +788,28 @@ counts_to_freqs ()
   int i;
 
   for (i = 0; i < n_basic_blocks; i++)
-    if (BASIC_BLOCK (i)->count > count_max)
-      count_max = BASIC_BLOCK (i)->count;
+    count_max = MAX (BASIC_BLOCK (i)->count, count_max);
 
   for (i = -2; i < n_basic_blocks; i++)
     {
       basic_block bb;
+
       if (i == -2)
 	bb = ENTRY_BLOCK_PTR;
       else if (i == -1)
 	bb = EXIT_BLOCK_PTR;
       else
 	bb = BASIC_BLOCK (i);
-      bb->frequency = ((bb->count * BB_FREQ_MAX + count_max / 2)
-		       / count_max);
+
+      bb->frequency = (bb->count * BB_FREQ_MAX + count_max / 2) / count_max;
     }
 }
 
-/* Return true if function is likely to be expensive, so there is no point
-   to optimizer performance of prologue, epilogue or do inlining at the
-   expense of code size growth.  THRESHOLD is the limit of number
-   of isntructions function can execute at average to be still considered
-   not expensive.  */
+/* Return true if function is likely to be expensive, so there is no point to
+   optimize performance of prologue, epilogue or do inlining at the expense
+   of code size growth.  THRESHOLD is the limit of number of isntructions
+   function can execute at average to be still considered not expensive.  */
+
 bool
 expensive_function_p (threshold)
 	int threshold;
@@ -836,19 +838,19 @@ expensive_function_p (threshold)
 
       for (insn = bb->head; insn != NEXT_INSN (bb->end);
 	   insn = NEXT_INSN (insn))
-	{
-	  if (active_insn_p (insn))
-	    {
-	      sum += bb->frequency;
-	      if (sum > limit)
-		return true;
-	    }
+	if (active_insn_p (insn))
+	  {
+	    sum += bb->frequency;
+	    if (sum > limit)
+	      return true;
 	}
     }
+
   return false;
 }
 
 /* Estimate basic blocks frequency by given branch probabilities.  */
+
 static void
 estimate_bb_frequencies (loops)
      struct loops *loops;
@@ -906,6 +908,7 @@ estimate_bb_frequencies (loops)
 	  fallthru->probability = REG_BR_PROB_BASE - probability;
 	}
     }
+
   ENTRY_BLOCK_PTR->succ->probability = REG_BR_PROB_BASE;
 
   /* Set up block info for each basic block.  */
@@ -922,11 +925,13 @@ estimate_bb_frequencies (loops)
 	bb = EXIT_BLOCK_PTR;
       else
 	bb = BASIC_BLOCK (i);
+
       BLOCK_INFO (bb)->tovisit = 0;
       for (e = bb->succ; e; e = e->succ_next)
 	EDGE_INFO (e)->back_edge_prob = ((double) e->probability
 					 / REG_BR_PROB_BASE);
     }
+
   /* First compute probabilities locally for each loop from innermost
      to outermost to examine probabilities for back edges.  */
   estimate_loops_at_level (loops->tree_root);
@@ -934,6 +939,7 @@ estimate_bb_frequencies (loops)
   /* Now fake loop around whole function to finalize probabilities.  */
   for (i = 0; i < n_basic_blocks; i++)
     BLOCK_INFO (BASIC_BLOCK (i))->tovisit = 1;
+
   BLOCK_INFO (ENTRY_BLOCK_PTR)->tovisit = 1;
   BLOCK_INFO (EXIT_BLOCK_PTR)->tovisit = 1;
   propagate_freq (ENTRY_BLOCK_PTR);
@@ -941,17 +947,19 @@ estimate_bb_frequencies (loops)
   for (i = 0; i < n_basic_blocks; i++)
     if (BLOCK_INFO (BASIC_BLOCK (i))->frequency > freq_max)
       freq_max = BLOCK_INFO (BASIC_BLOCK (i))->frequency;
+
   for (i = -2; i < n_basic_blocks; i++)
     {
       basic_block bb;
+
       if (i == -2)
 	bb = ENTRY_BLOCK_PTR;
       else if (i == -1)
 	bb = EXIT_BLOCK_PTR;
       else
 	bb = BASIC_BLOCK (i);
-      bb->frequency = (BLOCK_INFO (bb)->frequency * BB_FREQ_MAX / freq_max
-		       + 0.5);
+      bb->frequency
+	= BLOCK_INFO (bb)->frequency * BB_FREQ_MAX / freq_max + 0.5;
     }
 
   free_aux_for_blocks ();