* tree-ssa-loop-im.c: New file.

	* Makefile.in (tree-ssa-loop-im.o): Add.
	* cfgloop.c (superloop_at_depth): New function.
	* cfgloop.h (superloop_at_depth): Declare.
	* common.opt (ftree-lim): New flag.
	* expr.c (array_ref_up_bound): New function.
	* params.def (PARAM_LIM_EXPENSIVE): New parameter.
	* timevar.def (TV_LIM): New timevar.
	* tree-dfa.c (compute_immediate_uses): Respect TDFA_USE flags when
	computing immediate uses of a phi node.
	* tree-flow.h (struct tree_ann_common_d): Add aux field.
	(loop_commit_inserts, for_each_index, tree_ssa_lim): Declare.
	* tree-optimize.c (init_tree_optimization_passes): Add pass_lim.
	* tree-pass.h (pass_lim): Declare.
	* tree-ssa-loop.c (tree_ssa_loop_im, gate_tree_ssa_loop_im): New
	functions.
	(pass_lim): New pass structure.
	* tree-eh.c (tree_could_trap_p): Handle ARRAY_REFs correctly.
	* tree.c (in_array_bounds_p): New function.
	* tree.h (TREE_THIS_NOTRAP): Define also for ARRAY_REFs.
	(in_array_bounds_p, array_ref_up_bound): Declare.
	* doc/invoke.texi (-ftree-lim, --param lim-expensive): Document.
	* doc/passes.texi (tree-ssa-loop-im.c): Document.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@84441 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 14 insertions, 0 deletions

diff --git a/gcc/cfgloop.c b/gcc/cfgloop.c
index 3d13386ba4e..7709a03b2ab 100644
--- a/gcc/cfgloop.c
+++ b/gcc/cfgloop.c
@@ -101,6 +101,20 @@ flow_loop_nested_p (const struct loop *outer, const struct loop *loop)
 	 && loop->pred[outer->depth] == outer;
 }
 
+/* Returns superloop of LOOP at given DEPTH.  */
+
+struct loop *
+superloop_at_depth (struct loop *loop, unsigned depth)
+{
+  if (depth > (unsigned) loop->depth)
+    abort ();
+
+  if (depth == (unsigned) loop->depth)
+    return loop;
+
+  return loop->pred[depth];
+}
+
 /* Dump the loop information specified by LOOP to the stream FILE
    using auxiliary dump callback function LOOP_DUMP_AUX if non null.  */