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[graphite] avoid generation of empty guards in trivial cases

Message ID 1445452606-26195-1-git-send-email-s.pop@samsung.com
State New
Headers show

Commit Message

Sebastian Pop Oct. 21, 2015, 6:36 p.m. UTC 
We used to insert a trivial integer_onep condition around loops we know have
more than an iteration.  This patch avoids generating those conditions.

	* graphite-isl-ast-to-gimple.c (graphite_create_new_loop_guard): Do not call
	create_empty_if_region_on_edge when cond_expr is true.
	(translate_isl_ast_node_for): Check whether a guard has been generated.
---
 gcc/graphite-isl-ast-to-gimple.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)
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Patch

diff --git a/gcc/graphite-isl-ast-to-gimple.c b/gcc/graphite-isl-ast-to-gimple.c
index 2f2e2ba..1e02d12 100644
--- a/gcc/graphite-isl-ast-to-gimple.c
+++ b/gcc/graphite-isl-ast-to-gimple.c
@@ -707,7 +707,10 @@  graphite_create_new_loop_guard (edge entry_edge,
       cond_expr = fold_build2 (LT_EXPR, boolean_type_node, *lb, ub_one);
     }
 
-  exit_edge = create_empty_if_region_on_edge (entry_edge, cond_expr);
+  if (integer_onep (cond_expr))
+    exit_edge = entry_edge;
+  else
+    exit_edge = create_empty_if_region_on_edge (entry_edge, cond_expr);
 
   return exit_edge;
 }
@@ -723,10 +726,14 @@  translate_isl_ast_node_for (loop_p context_loop, __isl_keep isl_ast_node *node,
   tree type, lb, ub;
   edge last_e = graphite_create_new_loop_guard (next_e, node, &type,
 						&lb, &ub, ip);
-  edge true_e = get_true_edge_from_guard_bb (next_e->dest);
 
-  translate_isl_ast_for_loop (context_loop, node, true_e,
-			      type, lb, ub, ip);
+  if (last_e == next_e)
+    /* There was no guard generated.  */
+    return translate_isl_ast_for_loop (context_loop, node, last_e,
+				       type, lb, ub, ip);
+
+  edge true_e = get_true_edge_from_guard_bb (next_e->dest);
+  translate_isl_ast_for_loop (context_loop, node, true_e, type, lb, ub, ip);
   return last_e;
 }