2013-12-04  Radovan Obradovic  <robradovic@mips.com>
            Tom de Vries  <tom@codesourcery.com>

	* gcc.target/mips/mips.exp: Add use-caller-save to -ffoo/-fno-foo
	options.
	* gcc.dg/fuse-caller-save.c: New test.
	* gcc.target/mips/fuse-caller-save.c: Same.

diff --git a/gcc/testsuite/gcc.dg/fuse-caller-save.c b/gcc/testsuite/gcc.dg/fuse-caller-save.c
new file mode 100644
index 0000000..561a66d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/fuse-caller-save.c
@@ -0,0 +1,21 @@
+/* { dg-do run } */
+/* { dg-options "-fuse-caller-save" } */
+/* Testing -fuse-caller-save optimization option.  */
+
+static int __attribute__((noinline))
+bar (int x)
+{
+  return x + 3;
+}
+
+int __attribute__((noinline))
+foo (int y)
+{
+  return y + bar (y);
+}
+
+int
+main (void)
+{
+  return !(foo (5) == 13);
+}
diff --git a/gcc/testsuite/gcc.target/mips/fuse-caller-save.c b/gcc/testsuite/gcc.target/mips/fuse-caller-save.c
new file mode 100644
index 0000000..212ca45
--- /dev/null
+++ b/gcc/testsuite/gcc.target/mips/fuse-caller-save.c
@@ -0,0 +1,30 @@
+/* { dg-do compile } */
+/* { dg-options "-fuse-caller-save" } */
+/* { dg-skip-if "" { *-*-* }  { "*" } { "-Os" } } */
+/* Testing -fuse-caller-save optimization option.  */
+
+static int __attribute__((noinline)) NOCOMPRESSION
+bar (int x)
+{
+  return x + 3;
+}
+
+int __attribute__((noinline)) NOCOMPRESSION
+foo (int y)
+{
+  return y + bar (y);
+}
+
+int NOCOMPRESSION
+main (void)
+{
+  return !(foo (5) == 13);
+}
+
+/* Check that there are only 2 stack-saves: r31 in main and foo.  */
+
+/* Check that there only 2 sw/sd.  */
+/* { dg-final { scan-assembler-times "(?n)s\[wd\]\t\\\$.*,.*\\(\\\$sp\\)" 2 } } */
+
+/* Check that the first caller-save register is unused.  */
+/* { dg-final { scan-assembler-not "(\\\$16)" } } */
diff --git a/gcc/testsuite/gcc.target/mips/mips.exp b/gcc/testsuite/gcc.target/mips/mips.exp
index 1f0d0d6..5bfadec 100644
--- a/gcc/testsuite/gcc.target/mips/mips.exp
+++ b/gcc/testsuite/gcc.target/mips/mips.exp
@@ -305,6 +305,7 @@ foreach option {
     tree-vectorize
     unroll-all-loops
     unroll-loops
+    use-caller-save
 } {
     lappend mips_option_groups $option "-f(no-|)$option"
 }