s_floorl.s

Glibc 2.3.2源代码(解压后有100多M)

/*
 * Written by J.T. Conklin <[e-mail]>.
 * Changes for long double by Ulrich Drepper <[e-mail]>
 * Public domain.
 */

#include <machine/asm.h>

RCSID("$NetBSD: $")

ENTRY(__floorl)
	fldt	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 (__floorl)
weak_alias (__floorl, floorl)