newlib-cygwin/newlib/libc/machine/i386/f_frexp.S

44 lines
775 B
ArmAsm

/*
* ====================================================
* Copyright (C) 1998 by Cygnus Solutions. All rights reserved.
*
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
/*
Fast version of frexp using Intel float instructions.
double _f_frexp (double x, int *exp);
Function splits x into y * 2 ** z. It then
returns the value of y and updates *exp with z.
There is no error checking or setting of errno.
*/
#include "i386mach.h"
.global SYM (_f_frexp)
SYM (_f_frexp):
pushl ebp
movl esp,ebp
fldl 8(ebp)
movl 16(ebp),eax
fxtract
fld1
fchs
fxch
fscale
fstp st1
fxch
fld1
faddp
fistpl 0(eax)
leave
ret