s_floorf.s

glibc 2.9,最新版的C语言库函数

/*
 * Written by J.T. Conklin <[e-mail]>.
 * Public domain.
 */

#include <machine/asm.h>

RCSID("$NetBSD: s_floorf.S,v 1.3 1995/05/09 00:04:32 jtc Exp $")

ENTRY(__floorf)
	flds	4(%esp)
	subl	$8,%esp

	fstcw	4(%esp)			/* store fpu control word */

	/* We use here %edx although only the low 1 bits are defined.
	   But none of the operations should care and they are faster
	   than the 16 bit operations.  */
	movl	$0x400,%edx		/* round towards -oo */
	orl	4(%esp),%edx
	andl	$0xf7ff,%edx
	movl	%edx,(%esp)
	fldcw	(%esp)			/* load modified control word */

	frndint				/* round */

	fldcw	4(%esp)			/* restore original control word */

	addl	$8,%esp
	ret
END (__floorf)
weak_alias (__floorf, floorf)