predict.c (tree_predict_by_opcode): Get the probability for builtin_expect from param builtin_expect_probability.

        * predict.c (tree_predict_by_opcode): Get the probability
        for builtin_expect from param builtin_expect_probability.
        * params.def (BUILTIN_EXPECT_PROBABILITY): New parameter.
        * predict.def (PRED_BUILTIN_EXPECT_RELAXED): Fix comments.
        * doc/invoke.texi: Add documentation for builtin-expect-probability.
        * gcc.target/i386/cold-attribute-2.c: Fix the test by using original
        probability.
        * gcc.dg/tree-ssa/ipa-split-5.c: Ditto.
        * gcc.dg/tree-ssa/ipa-split-6.c: Ditto.

--This li (t)ene, and those below, will be ignored--

M    gcc/params.def
M    gcc/predict.def
M    gcc/ChangeLog
M    gcc/testsuite/gcc.dg/tree-ssa/ipa-split-5.c
M    gcc/testsuite/gcc.dg/tree-ssa/ipa-split-6.c
M    gcc/testsuite/gcc.target/i386/cold-attribute-2.c
M    gcc/predict.c
M    gcc/doc/invoke.texi

From-SVN: r203167

1 files changed, 5 insertions, 4 deletions

diff --git a/gcc/predict.c b/gcc/predict.c
index 2909117..e6a4095 100644
--- a/gcc/predict.c
+++ b/gcc/predict.c
@@ -2000,11 +2000,12 @@ tree_predict_by_opcode (basic_block bb)
   BITMAP_FREE (visited);
   if (val)
     {
+      int percent = PARAM_VALUE (BUILTIN_EXPECT_PROBABILITY);
+
+      gcc_assert (percent >= 0 && percent <= 100);
       if (integer_zerop (val))
-	predict_edge_def (then_edge, PRED_BUILTIN_EXPECT, NOT_TAKEN);
-      else
-	predict_edge_def (then_edge, PRED_BUILTIN_EXPECT, TAKEN);
-      return;
+        percent = 100 - percent;
+      predict_edge (then_edge, PRED_BUILTIN_EXPECT, HITRATE (percent));
     }
   /* Try "pointer heuristic."
      A comparison ptr == 0 is predicted as false.