From: Martin Sebor <msebor@redhat.com>
Date: Mon, 1 May 2017 16:46:49 +0000 (+0000)
Subject: re PR tree-optimization/79715 (hand-rolled strdup with unused result not eliminated)
X-Git-Tag: basepoints/gcc-9~7677
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=706eb1a70d6f1222cf14e84ab77c8b5404641182;p=thirdparty%2Fgcc.git

re PR tree-optimization/79715 (hand-rolled strdup with unused result not eliminated)

gcc/testsuite/ChangeLog:
	PR tree-optimization/79715
	* gcc.dg/pr79715.c: New test.

From-SVN: r247440
---

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index f1c61a668c54..e0e04f354653 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-05-01  Martin Sebor  <msebor@redhat.com>
+
+	PR tree-optimization/79715
+	* gcc.dg/pr79715.c: New test.
+
 2017-05-01  Tom de Vries  <tom@codesourcery.com>
 
 	PR testsuite/65941
diff --git a/gcc/testsuite/gcc.dg/pr79715.c b/gcc/testsuite/gcc.dg/pr79715.c
new file mode 100644
index 000000000000..0f0f90f71224
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr79715.c
@@ -0,0 +1,26 @@
+/* PR tree-optimization/79715 - hand-rolled strdup with unused result
+   not eliminated
+   { dg-do compile }
+   { dg-options "-O2 -Wall -fdump-tree-optimized" } */
+
+void f (const char *s)
+{
+  unsigned n = __builtin_strlen (s) + 1;
+  char *p = __builtin_malloc (n);
+  __builtin_memcpy (p, s, n);
+  __builtin_free (p);
+}
+
+void g (const char *s)
+{
+  unsigned n = __builtin_strlen (s) + 1;
+  char *p = __builtin_malloc (n);
+  __builtin_strcpy (p, s);
+  __builtin_free (p);
+}
+
+/* { dg-final { scan-tree-dump-not "free" "optimized" } }
+   { dg-final { scan-tree-dump-not "malloc" "optimized" } }
+   { dg-final { scan-tree-dump-not "memcpy" "optimized" } }
+   { dg-final { scan-tree-dump-not "strcpy" "optimized" } }
+   { dg-final { scan-tree-dump-not "strlen" "optimized" } } */