* cfgcleanup.c: Include params.h.

        (try_crossjump_bb): Use PARAM_MAX_CROSSJUMP_EDGES.  Fix test for
        too many outgoing edges from a block.
        * Makefile.in (cfgcleanup.o): Depend on PARAMS_H.
        * params.def (max-crossjump-edges): New.
        * doc/invoke.texi: Document it.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@62942 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 8 insertions, 5 deletions

diff --git a/gcc/cfgcleanup.c b/gcc/cfgcleanup.c
index 338281a6990..3607fc3fcdd 100644
--- a/gcc/cfgcleanup.c
+++ b/gcc/cfgcleanup.c
@@ -45,6 +45,7 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 #include "recog.h"
 #include "toplev.h"
 #include "cselib.h"
+#include "params.h"
 #include "tm_p.h"
 #include "target.h"
 
@@ -1464,7 +1465,7 @@ try_crossjump_bb (mode, bb)
 {
   edge e, e2, nexte2, nexte, fallthru;
   bool changed;
-  int n = 0;
+  int n = 0, max;
 
   /* Nothing to do if there is not at least two incoming edges.  */
   if (!bb->pred || !bb->pred->pred_next)
@@ -1473,11 +1474,13 @@ try_crossjump_bb (mode, bb)
   /* It is always cheapest to redirect a block that ends in a branch to
      a block that falls through into BB, as that adds no branches to the
      program.  We'll try that combination first.  */
-  for (fallthru = bb->pred; fallthru; fallthru = fallthru->pred_next, n++)
+  fallthru = NULL;
+  max = PARAM_VALUE (PARAM_MAX_CROSSJUMP_EDGES);
+  for (e = bb->pred; e ; e = e->pred_next, n++)
     {
-      if (fallthru->flags & EDGE_FALLTHRU)
-	break;
-      if (n > 100)
+      if (e->flags & EDGE_FALLTHRU)
+	fallthru = e;
+      if (n > max)
 	return false;
     }