auto import from //depot/cupcake/@135843
diff --git a/libm/src/s_fmaxl.c b/libm/src/s_fmaxl.c
new file mode 100644
index 0000000..c1a9dbe
--- /dev/null
+++ b/libm/src/s_fmaxl.c
@@ -0,0 +1,55 @@
+/*-
+ * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <sys/cdefs.h>
+/* __FBSDID("$FreeBSD: src/lib/msun/src/s_fmaxl.c,v 1.1 2004/06/30 07:04:01 das Exp $"); */
+
+#include <math.h>
+
+#include "fpmath.h"
+
+long double
+fmaxl(long double x, long double y)
+{
+ union IEEEl2bits u[2];
+
+ u[0].e = x;
+ mask_nbit_l(u[0]);
+ u[1].e = y;
+ mask_nbit_l(u[1]);
+
+ /* Check for NaNs to avoid raising spurious exceptions. */
+ if (u[0].bits.exp == 32767 && (u[0].bits.manh | u[0].bits.manl) != 0)
+ return (y);
+ if (u[1].bits.exp == 32767 && (u[1].bits.manh | u[1].bits.manl) != 0)
+ return (x);
+
+ /* Handle comparisons of signed zeroes. */
+ if (u[0].bits.sign != u[1].bits.sign)
+ return (u[0].bits.sign ? y : x);
+
+ return (x > y ? x : y);
+}