1 files changed, 57 insertions, 0 deletions
diff --git a/lib/libc/alpha/gen/flt_rounds.c b/lib/libc/alpha/gen/flt_rounds.c
new file mode 100644
index 0000000..102a87d
--- /dev/null
+++ b/lib/libc/alpha/gen/flt_rounds.c
@@ -0,0 +1,57 @@
+/* $Id$ */
+/*	From: NetBSD: flt_rounds.c,v 1.2 1997/07/18 00:30:30 thorpej Exp */
+
+/*
+ * Copyright (c) 1995 Christopher G. Demetriou
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Christopher G. Demetriou
+ *	for the NetBSD Project.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <machine/float.h>
+
+static const int map[] = {
+	0,	/* round to zero */
+	3,	/* round to negative infinity */
+	1,	/* round to nearest */
+	2	/* round to positive infinity */
+};
+
+int
+__flt_rounds()
+{
+	double fpcrval;
+	u_int64_t old;
+
+	__asm__("trapb");
+	__asm__("mf_fpcr %0" : "=f" (fpcrval));
+	__asm__("trapb");
+	old = *(u_int64_t *)&fpcrval;
+
+	return map[(old >> 58) & 0x3];
+}