Add signbitl.c that was missed as part of an earlier commit.

ok drahn@

diff --git a/lib/libc/arch/riscv64/gen/signbitl.c b/lib/libc/arch/riscv64/gen/signbitl.c
new file mode 100644 (file)
index 0000000..e016206
--- /dev/null
+++ b/lib/libc/arch/riscv64/gen/signbitl.c
@@ -0,0 +1,28 @@
+/*     $OpenBSD: signbitl.c,v 1.1 2021/04/28 08:25:07 kettenis Exp $   */
+/*
+ * Copyright (c) 2008 Martynas Venckus <martynas@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <machine/ieee.h>
+#include <math.h>
+
+int
+__signbitl(long double e)
+{
+       struct ieee_ext *p = (struct ieee_ext *)&e;
+
+       return p->ext_sign;
+}