diff --git a/libm/i387/s_floorf.S b/libm/i387/s_floorf.S
new file mode 100644
index 0000000..5d39acd
--- /dev/null
+++ b/libm/i387/s_floorf.S
@@ -0,0 +1,29 @@
+/*
+ * Written by J.T. Conklin <jtc@netbsd.org>.
+ * Public domain.
+ */
+
+#include <machine/asm.h>
+
+__FBSDID("$FreeBSD: src/lib/msun/i387/s_floorf.S,v 1.2 2005/05/06 15:44:20 deischen Exp $");
+/* RCSID("$NetBSD: s_floorf.S,v 1.3 1995/05/09 00:04:32 jtc Exp $") */
+
+ENTRY(floorf)
+	pushl	%ebp
+	movl	%esp,%ebp
+	subl	$8,%esp
+
+	fstcw	-4(%ebp)		/* store fpu control word */
+	movw	-4(%ebp),%dx
+	orw	$0x0400,%dx		/* round towards -oo */
+	andw	$0xf7ff,%dx
+	movw	%dx,-8(%ebp)
+	fldcw	-8(%ebp)		/* load modfied control word */
+
+	flds	8(%ebp);		/* round */
+	frndint
+
+	fldcw	-4(%ebp)		/* restore original control word */
+
+	leave
+	ret