1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22/* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 .ident "%Z%%M% %I% %E% SMI" 28 29 .file "%M%" 30 31#include <SYS.h> 32 33 .set cw,0 34 .set cw_old,2 35 .text 36 .align 16 37two_to_63: .4byte 0x5f000000 38 39 ENTRY(__xtoull) /* 387-stack to unsigned long long */ 40 subq $16,%rsp 41 fstcw cw_old(%rsp) 42 movw cw_old(%rsp),%ax 43 movw %ax,%cx 44 andw $0x0c00,%cx /* save RC */ 45 orw $0x0c00,%ax 46 movw %ax,cw(%rsp) 47 fldcw cw(%rsp) 48 flds two_to_63(%rip) 49 fcomip %st(1),%st /* compare 2**63 to x */ 50 jp .donotsub /* jump if x is NaN */ 51 ja .donotsub /* jump if 2**63 > x */ 52 fsubs two_to_63(%rip) /* subtract 2**63 */ 53.donotsub: 54 fistpll 8(%rsp) 55 fwait /* in case fistpll causes exception */ 56 movq 8(%rsp),%rax 57 jp .donotadd 58 ja .donotadd /* flags did not change */ 59 movq $0x8000000000000000,%rcx 60 addq %rcx,%rax /* add back 2**63 */ 61.donotadd: 62 fstcw cw(%rsp) /* fetch CW in case masks changed */ 63 movw cw(%rsp),%dx 64 andw $0xf3ff,%dx 65 orw %cx,%dx /* restore RC */ 66 movw %dx,cw(%rsp) 67 fldcw cw(%rsp) 68 addq $16,%rsp 69 ret 70 SET_SIZE(__xtoull) 71