Add PR markers to recent DSE changes. And...

	PR tree-optimization/86061
	* gcc.dg/tree-ssa/pr86061.c: New test.

From-SVN: r273745

gcc/ChangeLog

@@ -400,6 +400,7 @@
 
 2019-07-19  Jeff Law  <law@redhat.com>
 
+	PR tree-optimization/86061
 	* tree-ssa-dse.c (initialize_ao_ref_for_dse): Handle
 	strncpy.  Drop some trivial dead code.
 	(maybe_trim_memstar_call): Handle strncpy.

gcc/testsuite/ChangeLog

+2019-07-23  Jeff Law  <law@redhat.com>
+
+	PR tree-optimization/86061
+	* gcc.dg/tree-ssa/pr86061.c: New test.
+
 2019-07-23  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/83518
@@ -176,6 +181,7 @@
 
 2019-07-19  Jeff Law  <law@redhat.com>
 
+	PR tree-optimization/86061
 	* gcc.dg/tree-ssa/ssa-dse-37.c: New test.
 	* gcc.dg/tree-ssa/ssa-dse-38.c: New test.
 

gcc/testsuite/gcc.dg/tree-ssa/pr86061.c

+/* { dg-options "-O2 -fdump-tree-dse-details -fno-tree-fre" } */
+
+
+struct S { int i; char n[128]; int j; };
+
+void f (char*);
+
+void g (struct S *p)
+{
+  char a[sizeof p->n + 1];
+
+  __builtin_memset (a, 0, sizeof a);   // dead store, can be eliminated
+
+  __builtin_strncpy (a, p->n, sizeof a - 1);
+  a[sizeof a - 1] = '\0';
+
+  f (a);
+}
+
+/* { dg-final { scan-tree-dump-times "Deleted dead call" 1 "dse1" } } */