From: Kugan Vivekanandarajah <kuganv@linaro.org>
Date: Fri, 6 Jul 2018 22:12:52 +0000 (+0000)
Subject: tree-ssa-loop-niter.c (number_of_iterations_popcount): If popcount argument is checke... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b8b31957e4c7e28fc44ae1b1ce658ba49ff1aa18;p=gcc.git

tree-ssa-loop-niter.c (number_of_iterations_popcount): If popcount argument is checked for zero before entering loop, avoid checking again.

gcc/ChangeLog:

2018-07-06  Kugan Vivekanandarajah  <kuganv@linaro.org>

	* tree-ssa-loop-niter.c (number_of_iterations_popcount): If popcount
	argument is checked for zero before entering loop, avoid checking again.

From-SVN: r262487
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index acaea119eaf..10137d6b411 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2018-07-06  Kugan Vivekanandarajah  <kuganv@linaro.org>
+
+	* tree-ssa-loop-niter.c (number_of_iterations_popcount): If popcount
+	argument is checked for zero before entering loop, avoid checking again.
+
 2018-07-06  Kugan Vivekanandarajah  <kuganv@linaro.org>
 
 	* gimplify.h (generic_expr_could_trap_p): Set as global function.
diff --git a/gcc/tree-ssa-loop-niter.c b/gcc/tree-ssa-loop-niter.c
index 03588a012bd..f6fa2f74744 100644
--- a/gcc/tree-ssa-loop-niter.c
+++ b/gcc/tree-ssa-loop-niter.c
@@ -2596,10 +2596,15 @@ number_of_iterations_popcount (loop_p loop, edge exit,
 
   niter->niter = iter;
   niter->assumptions = boolean_true_node;
+
   if (adjust)
-    niter->may_be_zero = fold_build2 (EQ_EXPR, boolean_type_node, src,
+    {
+      tree may_be_zero = fold_build2 (EQ_EXPR, boolean_type_node, src,
 				      build_zero_cst
 				      (TREE_TYPE (src)));
+      niter->may_be_zero =
+	simplify_using_initial_conditions (loop, may_be_zero);
+    }
   else
     niter->may_be_zero = boolean_false_node;