From 4970bf23fef8e7b07763a80b608e121244605d10 Mon Sep 17 00:00:00 2001
From: jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 6 Dec 2017 19:27:41 +0000
Subject: [PATCH] 	PR tree-optimization/83293 	*
 gimple-ssa-strength-reduction.c (insert_initializers): Use 	GSI_NEW_STMT
 instead of GSI_SAME_STMT in gsi_insert_after that 	might insert into
 empty bb.

	* g++.dg/torture/pr83293.C: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@255451 138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/ChangeLog                          |  5 +++++
 gcc/gimple-ssa-strength-reduction.c    |  2 +-
 gcc/testsuite/ChangeLog                |  3 +++
 gcc/testsuite/g++.dg/torture/pr83293.C | 39 ++++++++++++++++++++++++++++++++++
 4 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/g++.dg/torture/pr83293.C

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9cfc382239b..0310a5202d8 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,10 @@
 2017-12-06  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/83293
+	* gimple-ssa-strength-reduction.c (insert_initializers): Use
+	GSI_NEW_STMT instead of GSI_SAME_STMT in gsi_insert_after that
+	might insert into empty bb.
+
 	PR sanitizer/81281
 	* match.pd ((T)(P + A) - (T)P -> (T) A): Split into separate
 	simplify for plus with :c added, and pointer_plus without that.
diff --git a/gcc/gimple-ssa-strength-reduction.c b/gcc/gimple-ssa-strength-reduction.c
index 42320ff6682..b51239b94d0 100644
--- a/gcc/gimple-ssa-strength-reduction.c
+++ b/gcc/gimple-ssa-strength-reduction.c
@@ -3418,7 +3418,7 @@ insert_initializers (slsr_cand_t c)
 		  gsi_insert_after (&gsi, cast_stmt, GSI_NEW_STMT);
 		  gimple_set_location (cast_stmt, loc);
 		}
-	      gsi_insert_after (&gsi, init_stmt, GSI_SAME_STMT);
+	      gsi_insert_after (&gsi, init_stmt, GSI_NEW_STMT);
 	    }
 
 	  gimple_set_location (init_stmt, gimple_location (basis_stmt));
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 3ad19f056ec..67bdbbd5b33 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2017-12-06  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/83293
+	* g++.dg/torture/pr83293.C: New test.
+
 	PR sanitizer/81281
 	* gcc.c-torture/execute/pr81281.c: New test.
 	* gcc.dg/pr81281-1.c: New test.
diff --git a/gcc/testsuite/g++.dg/torture/pr83293.C b/gcc/testsuite/g++.dg/torture/pr83293.C
new file mode 100644
index 00000000000..f4556f3ee52
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/pr83293.C
@@ -0,0 +1,39 @@
+// PR tree-optimization/83293
+
+typedef __SIZE_TYPE__ size_t;
+template <typename T, typename> struct A {
+  T a;
+  A (T x) : a(x) {}
+  T foo () { return a; }
+};
+
+template <typename T, typename U, typename V>
+int
+operator==(A<T, V> x, A<U, V> p2)
+{
+  return x.foo () == p2.foo ();
+}
+
+struct B { struct { int *b, *c; } d; };
+struct C : B {
+  A<int *, int> bar () { return d.b; }
+  A<int *, int> baz () { return d.c; }
+  size_t boo () { return d.c - d.b; }
+  int zoo () { return bar () == baz (); }
+};
+struct D { C e; } a;
+size_t b;
+
+size_t
+test (int x)
+{
+  size_t c (x * b);
+  if (!a.e.zoo ())
+    {
+      x += 2;
+      for (size_t d = 0, e = a.e.boo (); d < e; ++d)
+	c += test (0);
+    }
+  c += (x - 1) * b;
+  return c;
+}
-- 
2.11.4.GIT