re PR target/43884 (Performance degradation for simple fibonacci numbers calculation)

	PR tree-optimization/43884
	PR lto/44334
	* predict.c (maybe_hot_frequency_p): Use entry block frequency as an base.
	* doc/invoke.texi (hot-bb-frequency-fraction): Update docs.
	* gcc.dg/autopar/outer-2.c: Increase array size.
	* gcc.dg/tree-ssa/ldist-pr45948.c: Update test.

From-SVN: r169136

gcc/ChangeLog

+2011-01-22  Jan Hubicka  <jh@suse.cz>
+
+	PR tree-optimization/43884
+	PR lto/44334
+	* predict.c (maybe_hot_frequency_p): Use entry block frequency as an base.
+	* doc/invoke.texi (hot-bb-frequency-fraction): Update docs.
+
 2011-01-22  Anatoly Sokolov  <aesok@post.ru>
 
 	* config/s390/s390.h (REGISTER_MOVE_COST, MEMORY_MOVE_COST): Remove.

gcc/predict.c

@@ -126,7 +126,7 @@ maybe_hot_frequency_p (int freq)
   if (node->frequency == NODE_FREQUENCY_EXECUTED_ONCE
       && freq <= (ENTRY_BLOCK_PTR->frequency * 2 / 3))
     return false;
-  if (freq < BB_FREQ_MAX / PARAM_VALUE (HOT_BB_FREQUENCY_FRACTION))
+  if (freq < ENTRY_BLOCK_PTR->frequency / PARAM_VALUE (HOT_BB_FREQUENCY_FRACTION))
     return false;
   return true;
 }

gcc/testsuite/ChangeLog

+2011-01-22  Jan Hubicka  <jh@suse.cz>
+
+	PR tree-optimization/43884
+	PR lto/44334
+	* gcc.dg/autopar/outer-2.c: Increase array size.
+	* gcc.dg/tree-ssa/ldist-pr45948.c: Update test.
+
 2011-01-22  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/38536

gcc/testsuite/gcc.dg/autopar/outer-2.c

@@ -6,7 +6,7 @@ void abort (void);
 void parloop (int N)
 {
   int i, j,ii;
-  int x[400][10][400];
+  int x[401][10][401];
 
 for (ii = 0; ii < N; ii++)
   for (i = 0; i < N; i++)

gcc/testsuite/gcc.dg/tree-ssa/ldist-pr45948.c

@@ -18,6 +18,6 @@ foo (int i, int n)
 
 /* We should apply loop distribution and generate 2 memset (0).  */
 
-/* { dg-final { scan-tree-dump "distributed: split to 3" "ldist" } } */
+/* { dg-final { scan-tree-dump "distributed: split to 2" "ldist" } } */
 /* { dg-final { scan-tree-dump-times "__builtin_memset" 4 "ldist" } } */
 /* { dg-final { cleanup-tree-dump "ldist" } } */