ilogbf.s revision 25c28e83beb90e7c80452a7c818c5e6f73a07dc8
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include "libm.h"
#include "libm_synonyms.h"
#include "xpg6.h"
.data
.align 8
jmp 0f
.bexp_0:
0:
PIC_SETUP(0)
je 1f
1:
PIC_SETUP(1)
/ just in case)
movl $0x7f800000,%eax / eax <-- single_bexp_mask
andl (%esp),%eax / eax[23..30] <-- bexp(x*2**23),
/ rest_of(eax) <-- 0
shrl $23,%eax / eax <-- zero_xtnd(bexp(x*2**23))
subl $150,%eax / unbias rebiased x by 150 (= 127 + 23)
addl $4,%esp / restore stack for caller
ret
.align 4
SET_SIZE(ilogbf)