LoongArch: Enable '-free' starting at -O2.

gcc/ChangeLog:

	* common/config/loongarch/loongarch-common.cc:
	Enable '-free' on O2 and above.
	* doc/invoke.texi: Modify the description information
	of the '-free' compilation option and add the LoongArch
	description.

gcc/testsuite/ChangeLog:

	* gcc.target/loongarch/sign-extend.c: New test.

1 files changed, 25 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.target/loongarch/sign-extend.c b/gcc/testsuite/gcc.target/loongarch/sign-extend.c
new file mode 100644
index 0000000..3f339d0
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/sign-extend.c
@@ -0,0 +1,25 @@
+/* { dg-do compile } */
+/* { dg-options "-mabi=lp64d -O2" } */
+/* { dg-final { scan-assembler-times "slli.w" 1 } } */
+
+extern int PL_savestack_ix;
+extern int PL_regsize;
+extern int PL_savestack_max;
+void Perl_savestack_grow_cnt (int need);
+extern void Perl_croak (char *);
+
+int
+S_regcppush(int parenfloor)
+{
+  int retval = PL_savestack_ix;
+  int paren_elems_to_push = (PL_regsize - parenfloor) * 4;
+  int p;
+
+  if (paren_elems_to_push < 0)
+    Perl_croak ("panic: paren_elems_to_push < 0");
+
+  if (PL_savestack_ix + (paren_elems_to_push + 6) > PL_savestack_max)
+    Perl_savestack_grow_cnt (paren_elems_to_push + 6);
+
+  return retval;
+}