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diff --git a/lib/libc/mips/gen/modf.S b/lib/libc/mips/gen/modf.S
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+/*-
+ * Copyright (c) 1991, 1993, 1995
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Ralph Campbell.
+ *
+ * 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 the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 <machine/asm.h>
+
+#if defined(LIBC_SCCS) 
+	.text
+	.asciz "$OpenBSD$"
+#endif /* LIBC_SCCS */
+
+/*
+ * double modf(val, iptr)
+ *	double val, *iptr;
+ * returns: xxx and n (in *iptr) where val == n.xxx
+ */
+LEAF(modf)
+	.set	reorder
+	cfc1	t0, $31			# get the control register
+	li.d	$f2, 4503599627370496e0 # f2 <- 2^52
+
+	or	t1, t0, 0x3		# set rounding mode to round to zero
+	xor	t1, t1, 0x2		#  (i.e., 01)
+	ctc1	t1, $31
+
+	mov.d	$f0, $f12		# f0 <- f12
+	abs.d	$f4, $f12		# f4 <- |f12|
+	c.olt.d $f4, $f2		# f4 ? < f2 
+	bc1f	1f			# leave f0 alone if Nan, infinity 
+					# or >=2^52
+	c.eq.d	$f12,$f4		# was f12 positive ?
+	add.d	$f4,$f2,$f4		# round off to integer
+	bc1f	2f			# No -> will have to negate result
+	sub.d	$f0,$f4,$f2		# Remove fudge factor
+	j	1f			# integer fraction got
+2:	
+	sub.d	$f0,$f2,$f4		# Remove fudge factor and negate
+1:	
+	ctc1	t0, $31			# restore old rounding mode
+	s.d	$f0, 0(a2)		# save the integer part
+	sub.d	$f0, $f12, $f0		# subtract val - integer part
+	j	ra
+END(modf)