/*
 * 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
 * or http://www.opensolaris.org/os/licensing.
 * 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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

        .file   "_xtoll.s"

#include <SYS.h>

        .set    cw,0
        .set    cw_old,2
        .set    two_words,4

/* This function truncates the top of the 387 stack into a signed long. */

        ENTRY(__xtol)   /* 387-stack to signed long */
        subq    $8,%rsp
        fstcw   cw_old(%rsp)
        movw    cw_old(%rsp),%ax
        movw    %ax,%cx
        andw    $0x0c00,%cx             /* save RC */
        orw     $0x0c00,%ax
        movw    %ax,cw(%rsp)
        fldcw   cw(%rsp)
        fistpl  two_words(%rsp)
                                        /* fwait implied here */
        fstcw   cw(%rsp)                /* fetch CW in case masks changed */
        movw    cw(%rsp),%ax
        andw    $0xf3ff,%ax
        orw     %cx,%ax                 /* restore RC */
        movw    %ax,cw(%rsp)
        fldcw   cw(%rsp)
        movl    two_words(%rsp),%eax
        addq    $8,%rsp
        ret
        SET_SIZE(__xtol)

/* This function truncates the top of the 387 stack into a signed long long. */

        ENTRY(__xtoll)  /* 387-stack to signed long long */
        subq    $16,%rsp
        fstcw   cw_old(%rsp)
        movw    cw_old(%rsp),%ax
        movw    %ax,%cx
        andw    $0x0c00,%cx             /* save RC */
        orw     $0x0c00,%ax
        movw    %ax,cw(%rsp)
        fldcw   cw(%rsp)
        fistpll 8(%rsp)
                                        /* fwait implied here */
        fstcw   cw(%rsp)                /* fetch CW in case masks changed */
        movw    cw(%rsp),%ax
        andw    $0xf3ff,%ax
        orw     %cx,%ax                 /* restore RC */
        movw    %ax,cw(%rsp)
        fldcw   cw(%rsp)
        movq    8(%rsp),%rax
        addq    $16,%rsp
        ret
        SET_SIZE(__xtoll)

/* This function truncates the top of the 387 stack into a unsigned long. */

        .align  16
two_to_31: .4byte       0x4f000000

        ENTRY(__xtoul)  /* 387-stack to unsigned */
        subq    $8,%rsp
        fstcw   cw_old(%rsp)
        movw    cw_old(%rsp),%ax
        movw    %ax,%cx
        andw    $0x0c00,%cx             /* save RC */
        orw     $0x0c00,%ax
        movw    %ax,cw(%rsp)
        fldcw   cw(%rsp)
        flds    two_to_31(%rip)
        fcomip  %st(1),%st              /* compare 2**31 to x */
        jp      .donotsub               /* jump if x is NaN */
        ja      .donotsub               /* jump if 2**31 > x */
        fsubs   two_to_31(%rip) /* subtract 2**31 */
.donotsub:
        fistpl  two_words(%rsp)
        fwait                           /* in case fistpl causes exception */
        movl    two_words(%rsp),%eax
        jp      .donotadd               /* flags did not change */
        ja      .donotadd               /* flags did not change */
        addl    $-2147483648,%eax       /* add back 2**31 */
.donotadd:
        fstcw   cw(%rsp)                /* fetch CW in case masks changed */
        movw    cw(%rsp),%dx
        andw    $0xf3ff,%dx
        orw     %cx,%dx                 /* restore RC */
        movw    %dx,cw(%rsp)
        fldcw   cw(%rsp)
        addq    $8,%rsp
        ret
        SET_SIZE(__xtoul)