params.def (PARAM_MAX_GROW_COPY_BB_INSNS): New.

        * params.def (PARAM_MAX_GROW_COPY_BB_INSNS): New.
        * bb-reorder.c (copy_bb_p): Use it.
        * doc/invoke.texi (param table): Add max-grow-copy-bb-insn.

From-SVN: r105011

gcc/ChangeLog

+2005-10-05  David Edelsohn  <edelsohn@gnu.org>
+
+	* params.def (PARAM_MAX_GROW_COPY_BB_INSNS): New.
+	* bb-reorder.c (copy_bb_p): Use it.
+	* doc/invoke.texi (param table): Add max-grow-copy-bb-insn.
+
 2005-10-05  Richard Henderson  <rth@redhat.com>
 
 	PR target/23602

gcc/bb-reorder.c

@@ -1173,7 +1173,7 @@ copy_bb_p (basic_block bb, int code_may_grow)
     return false;
 
   if (code_may_grow && maybe_hot_bb_p (bb))
-    max_size *= 8;
+    max_size *= PARAM_VALUE (PARAM_MAX_GROW_COPY_BB_INSNS);
 
   FOR_BB_INSNS (bb, insn)
     {

gcc/doc/invoke.texi

@@ -5738,6 +5738,11 @@ of two blocks before crossjumping will be performed on them.  This
 value is ignored in the case where all instructions in the block being
 crossjumped from are matched.  The default value is 5.
 
+@item max-grow-copy-bb-insns
+The maximum code size expansion factor when copying basic blocks
+instead of jumping.  The expansion is relative to a jump instruction.
+The default value is 8.
+
 @item max-goto-duplication-insns
 The maximum number of instructions to duplicate to a block that jumps
 to a computed goto.  To avoid @math{O(N^2)} behavior in a number of

gcc/params.def

@@ -349,6 +349,12 @@ DEFPARAM(PARAM_MIN_CROSSJUMP_INSNS,
      "The minimum number of matching instructions to consider for crossjumping",
      5, 0, 0)
 
+/* The maximum number expansion factor when copying basic blocks.  */
+DEFPARAM(PARAM_MAX_GROW_COPY_BB_INSNS,
+     "max-grow-copy-bb-insns",
+     "The maximum expansion factor when copying basic blocks",
+     8, 0, 0)
+
 /* The maximum number of insns to duplicate when unfactoring computed gotos.  */
 DEFPARAM(PARAM_MAX_GOTO_DUPLICATION_INSNS,
      "max-goto-duplication-insns",