1 files changed, 81 insertions, 0 deletions
diff --git a/StdLib/LibC/Main/Arm/flt_rounds.c b/StdLib/LibC/Main/Arm/flt_rounds.c
new file mode 100644
index 0000000000..3f43650270
--- /dev/null
+++ b/StdLib/LibC/Main/Arm/flt_rounds.c
@@ -0,0 +1,81 @@
+/*	$NetBSD: flt_rounds.c,v 1.3 2006/02/25 00:58:35 wiz Exp $	*/
+
+/*
+ * Copyright (c) 1996 Mark Brinicombe
+ * 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 Mark Brinicombe
+ *	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/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: flt_rounds.c,v 1.3 2006/02/25 00:58:35 wiz Exp $");
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+#include <ieeefp.h>
+
+static const int map[] = {
+	1,	/* round to nearest */
+	2,	/* round to positive infinity */
+	3,	/* round to negative infinity */
+	0	/* round to zero */
+};
+
+/*
+ * Return the current FP rounding mode
+ *
+ * Returns:
+ *	0 - round to zero
+ *	1 - round to nearest
+ *	2 - round to postive infinity
+ *	3 - round to negative infinity
+ *
+ * ok all we need to do is get the current FP rounding mode
+ * index our map table and return the appropriate value.
+ *
+ * HOWEVER:
+ * The ARM FPA codes the rounding mode into the actual FP instructions
+ * so there is no such thing as a global rounding mode.
+ * The default is round to nearest if rounding is not explicitly specified.
+ * FP instructions generated by GCC will not explicitly specify a rounding
+ * mode.
+ *
+ * So the best we can do it to return the rounding mode FP instructions
+ * use if rounding is not specified which is round to nearest.
+ *
+ * This could change in the future with new floating point emulators or
+ * soft float FP libraries.
+ */
+
+int __flt_rounds(void);
+
+int
+__flt_rounds()
+{
+	return(map[fpgetround()]);
+}