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view usr/src/lib/libc/i386/fp/_xtoll.s @ 7298:b69e27387f74
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| author | Mark J. Nelson <Mark.J.Nelson@Sun.COM> |
|---|---|
| date | Wed, 06 Aug 2008 16:29:39 -0600 |
| parents | 68f95e015346 |
| children |
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/* * 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 .set four_words,8 / This function truncates the top of the 387 stack into a signed long. ENTRY(__xtol) // 387-stack to signed long subl $8,%esp fstcw cw_old(%esp) movw cw_old(%esp),%ax movw %ax,%cx andw $0x0c00,%cx // save RC orw $0x0c00,%ax movw %ax,cw(%esp) fldcw cw(%esp) fistpl two_words(%esp) // fwait implied here fstcw cw(%esp) // fetch CW in case masks changed value movw cw(%esp),%ax andw $0xf3ff,%ax orw %cx,%ax // restore RC movw %ax,cw(%esp) fldcw cw(%esp) movl two_words(%esp),%eax addl $8,%esp 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 subl $12,%esp fstcw cw_old(%esp) movw cw_old(%esp),%ax movw %ax,%cx andw $0x0c00,%cx // save RC orw $0x0c00,%ax movw %ax,cw(%esp) fldcw cw(%esp) fistpll two_words(%esp) // fwait implied here fstcw cw(%esp) // fetch CW in case masks changed value movw cw(%esp),%ax andw $0xf3ff,%ax orw %cx,%ax // restore RC movw %ax,cw(%esp) fldcw cw(%esp) movl two_words(%esp),%eax movl four_words(%esp),%edx addl $12,%esp ret SET_SIZE(__xtoll) / This function truncates the top of the 387 stack into a unsigned long. .align 4 two_to_31: .long 0x4f000000 ENTRY(__xtoul) // 387-stack to unsigned long subl $8,%esp fstcw cw_old(%esp) movw cw_old(%esp),%ax movw %ax,%cx andw $0x0c00,%cx // save RC orw $0x0c00,%ax movw %ax,cw(%esp) fldcw cw(%esp) _prologue_ fcoms _sref_(two_to_31) // compare st to 2**31 _epilogue_ fstsw %ax // store status in %ax // use fstsw for correct trap handling sahf // load AH into flags jb .donotsub // jump if st < 2**31 or is NaN _prologue_ fsubs _sref_(two_to_31) // subtract 2**31 _epilogue_ .donotsub: fistpl two_words(%esp) fwait // in case fistpl causes exception movl two_words(%esp),%eax jb .donotadd // flags did not change add $0x80000000,%eax // add back 2**31 .donotadd: fstcw cw(%esp) // fetch CW in case masks changed value movw cw(%esp),%dx andw $0xf3ff,%dx orw %cx,%dx // restore RC movw %dx,cw(%esp) fldcw cw(%esp) addl $8,%esp ret SET_SIZE(__xtoul)