* loop-unswitch.c (unswitch_single_loop): Use

	estimated_loop_iterations_int to prevent unswitching when loop
	is known to not roll.
	* tree-ssa-loop-niter.c (estimated_loop_iterations): Do not segfault
	when SCEV is not initialized.
	(max_loop_iterations): Likewise.
	* tree-ssa-loop-unswitch.c (tree_ssa_unswitch_loops): Use
	estimated_loop_iterations_int to prevent unswithcing when
	loop is known to not roll.
	* tree-scalar-evolution.c (scev_initialized_p): New function.
	* tree-scalar-evolution.h (scev_initialized_p): Likewise.
	* loop-unroll.c (decide_peel_once_rolling): Use
	max_loop_iterations_int.
	(unroll_loop_constant_iterations): Update
	nb_iterations_upper_bound and nb_iterations_estimate.
	(decide_unroll_runtime_iterations): Use
	estimated_loop_iterations or max_loop_iterations;
	(unroll_loop_runtime_iterations): fix profile updating.
	(decide_peel_simple): Use estimated_loop_iterations
	and max_loop_iterations.
	(decide_unroll_stupid): Use estimated_loop_iterations
	ad max_loop_iterations.
	* loop-doloop.c (doloop_modify): Use max_loop_iterations_int.
	(doloop_optimize): Likewise.
	* loop-iv.c (iv_number_of_iterations): Use record_niter_bound.
	(find_simple_exit): Likewise.
	* cfgloop.h (struct niter_desc): Remove niter_max.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@192219 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 8 insertions, 0 deletions

diff --git a/gcc/tree-scalar-evolution.c b/gcc/tree-scalar-evolution.c
index d88bb1aa861..325654bac1b 100644
--- a/gcc/tree-scalar-evolution.c
+++ b/gcc/tree-scalar-evolution.c
@@ -3124,6 +3124,14 @@ scev_initialize (void)
     }
 }
 
+/* Return true if SCEV is initialized.  */
+
+bool
+scev_initialized_p (void)
+{
+  return scalar_evolution_info != NULL;
+}
+
 /* Cleans up the information cached by the scalar evolutions analysis
    in the hash table.  */