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diff --git a/sysdeps/libm-i387/s_floor.S b/sysdeps/libm-i387/s_floor.S
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+/*
+ * Written by J.T. Conklin <jtc@netbsd.org>.
+ * Public domain.
+ */
+
+#include <machine/asm.h>
+
+RCSID("$NetBSD: s_floor.S,v 1.4 1995/05/09 00:01:59 jtc Exp $")
+
+ENTRY(__floor)
+	pushl	%ebp
+	movl	%esp,%ebp
+	subl	$8,%esp
+
+	fstcw	-12(%ebp)		/* store fpu control word */
+	movw	-12(%ebp),%dx
+	orw	$0x0400,%dx		/* round towards -oo */
+	andw	$0xf7ff,%dx
+	movw	%dx,-16(%ebp)
+	fldcw	-16(%ebp)		/* load modfied control word */
+
+	fldl	8(%ebp);		/* round */
+	frndint
+
+	fldcw	-12(%ebp)		/* restore original control word */
+
+	leave
+	ret
+weak_alias (__floor, floor)