s_scalbnl.s

glibc 库, 不仅可以学习使用库函数,还可以学习函数的具体实现,是提高功力的好资料

/*
 * Written by J.T. Conklin <[e-mail]>.
 * Changes for long double by Ulrich Drepper <[e-mail]>
 * Changes for x86-64 by Andreas Jaeger <[e-mail]>=09
 * Public domain.
 */

#include <machine/asm.h>

ENTRY(__scalbnl)
	movl	%edi,-4(%rsp)
	fildl	-4(%rsp)
	fldt	8(%rsp)
	fscale
	fstp	%st(1)
	ret
END (__scalbnl)
weak_alias (__scalbnl, scalbnl)