1*5d9d9091SRichard Lowe/* 2*5d9d9091SRichard Lowe * CDDL HEADER START 3*5d9d9091SRichard Lowe * 4*5d9d9091SRichard Lowe * The contents of this file are subject to the terms of the 5*5d9d9091SRichard Lowe * Common Development and Distribution License (the "License"). 6*5d9d9091SRichard Lowe * You may not use this file except in compliance with the License. 7*5d9d9091SRichard Lowe * 8*5d9d9091SRichard Lowe * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*5d9d9091SRichard Lowe * or http://www.opensolaris.org/os/licensing. 10*5d9d9091SRichard Lowe * See the License for the specific language governing permissions 11*5d9d9091SRichard Lowe * and limitations under the License. 12*5d9d9091SRichard Lowe * 13*5d9d9091SRichard Lowe * When distributing Covered Code, include this CDDL HEADER in each 14*5d9d9091SRichard Lowe * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*5d9d9091SRichard Lowe * If applicable, add the following below this CDDL HEADER, with the 16*5d9d9091SRichard Lowe * fields enclosed by brackets "[]" replaced with your own identifying 17*5d9d9091SRichard Lowe * information: Portions Copyright [yyyy] [name of copyright owner] 18*5d9d9091SRichard Lowe * 19*5d9d9091SRichard Lowe * CDDL HEADER END 20*5d9d9091SRichard Lowe */ 21*5d9d9091SRichard Lowe/* 22*5d9d9091SRichard Lowe * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23*5d9d9091SRichard Lowe */ 24*5d9d9091SRichard Lowe/* 25*5d9d9091SRichard Lowe * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 26*5d9d9091SRichard Lowe * Use is subject to license terms. 27*5d9d9091SRichard Lowe */ 28*5d9d9091SRichard Lowe 29*5d9d9091SRichard Lowe .file "nextafter.s" 30*5d9d9091SRichard Lowe 31*5d9d9091SRichard Lowe#include "libm.h" 32*5d9d9091SRichard LoweLIBM_ANSI_PRAGMA_WEAK(nextafter,function) 33*5d9d9091SRichard Lowe .weak _nextafter 34*5d9d9091SRichard Lowe .type _nextafter,@function 35*5d9d9091SRichard Lowe_nextafter = __nextafter 36*5d9d9091SRichard Lowe#include "libm_protos.h" 37*5d9d9091SRichard Lowe 38*5d9d9091SRichard Lowe .data 39*5d9d9091SRichard Lowe .align 8 40*5d9d9091SRichard LoweFmin: .long 0x1,0x0 41*5d9d9091SRichard Loweftmp: .long 0,0 /// WILL WRITE INTO 42*5d9d9091SRichard Lowe 43*5d9d9091SRichard Lowe 44*5d9d9091SRichard Lowe ENTRY(nextafter) 45*5d9d9091SRichard Lowe pushl %ebp 46*5d9d9091SRichard Lowe movl %esp,%ebp 47*5d9d9091SRichard Lowe fldl 16(%ebp) / y 48*5d9d9091SRichard Lowe subl $8,%esp 49*5d9d9091SRichard Lowe fldl 8(%ebp) / load x 50*5d9d9091SRichard Lowe fucom / x : y 51*5d9d9091SRichard Lowe fstsw %ax 52*5d9d9091SRichard Lowe sahf 53*5d9d9091SRichard Lowe jp .NaN 54*5d9d9091SRichard Lowe je .equal 55*5d9d9091SRichard Lowe fstp %st(1) / x 56*5d9d9091SRichard Lowe ja .bigger 57*5d9d9091SRichard Lowe / x < y 58*5d9d9091SRichard Lowe ftst 59*5d9d9091SRichard Lowe movl $1,%ecx /// Fmin 60*5d9d9091SRichard Lowe movl %ecx,-8(%ebp) 61*5d9d9091SRichard Lowe movl $0,%ecx /// Fmin+4 62*5d9d9091SRichard Lowe movl %ecx,-4(%ebp) 63*5d9d9091SRichard Lowe fnstsw %ax 64*5d9d9091SRichard Lowe sahf 65*5d9d9091SRichard Lowe je .final 66*5d9d9091SRichard Lowe ja .addulp 67*5d9d9091SRichard Lowe jb .subulp 68*5d9d9091SRichard Lowe.bigger: 69*5d9d9091SRichard Lowe / x > y 70*5d9d9091SRichard Lowe ftst 71*5d9d9091SRichard Lowe movl $1,%ecx /// Fmin 72*5d9d9091SRichard Lowe movl %ecx,-8(%ebp) 73*5d9d9091SRichard Lowe movl $0,%ecx /// Fmin+4 74*5d9d9091SRichard Lowe xorl $0x80000000,%ecx 75*5d9d9091SRichard Lowe movl %ecx,-4(%ebp) 76*5d9d9091SRichard Lowe fnstsw %ax 77*5d9d9091SRichard Lowe sahf 78*5d9d9091SRichard Lowe je .final 79*5d9d9091SRichard Lowe jb .addulp 80*5d9d9091SRichard Lowe.subulp: 81*5d9d9091SRichard Lowe movl 8(%ebp),%eax / low x 82*5d9d9091SRichard Lowe movl 12(%ebp),%ecx / high x 83*5d9d9091SRichard Lowe subl $1,%eax / low x - ulp 84*5d9d9091SRichard Lowe movl %eax,-8(%ebp) 85*5d9d9091SRichard Lowe sbbl $0x0,%ecx 86*5d9d9091SRichard Lowe movl %ecx,-4(%ebp) 87*5d9d9091SRichard Lowe jmp .final 88*5d9d9091SRichard Lowe.addulp: 89*5d9d9091SRichard Lowe movl 8(%ebp),%eax / low x 90*5d9d9091SRichard Lowe movl 12(%ebp),%ecx / high x 91*5d9d9091SRichard Lowe addl $1,%eax / low x + ulp 92*5d9d9091SRichard Lowe movl %eax,-8(%ebp) 93*5d9d9091SRichard Lowe adcl $0x0,%ecx 94*5d9d9091SRichard Lowe movl %ecx,-4(%ebp) 95*5d9d9091SRichard Lowe 96*5d9d9091SRichard Lowe.final: 97*5d9d9091SRichard Lowe fstp %st(0) 98*5d9d9091SRichard Lowe fldl -8(%ebp) 99*5d9d9091SRichard Lowe andl $0x7ff00000,%ecx 100*5d9d9091SRichard Lowe jz .underflow 101*5d9d9091SRichard Lowe cmpl $0x7ff00000,%ecx 102*5d9d9091SRichard Lowe je .overflow 103*5d9d9091SRichard Lowe jmp .return 104*5d9d9091SRichard Lowe.overflow: 105*5d9d9091SRichard Lowe PIC_SETUP(1) 106*5d9d9091SRichard Lowe pushl $46 107*5d9d9091SRichard Lowe fstp %st(0) / stack empty 108*5d9d9091SRichard Lowe pushl -4(%ebp) 109*5d9d9091SRichard Lowe pushl -8(%ebp) 110*5d9d9091SRichard Lowe pushl -4(%ebp) 111*5d9d9091SRichard Lowe pushl -8(%ebp) 112*5d9d9091SRichard Lowe call PIC_F(_SVID_libm_err) 113*5d9d9091SRichard Lowe addl $20,%esp 114*5d9d9091SRichard Lowe PIC_WRAPUP 115*5d9d9091SRichard Lowe jmp .return 116*5d9d9091SRichard Lowe.underflow: 117*5d9d9091SRichard Lowe PIC_SETUP(2) 118*5d9d9091SRichard Lowe fldl PIC_L(Fmin) 119*5d9d9091SRichard Lowe fmul %st(0),%st 120*5d9d9091SRichard Lowe fstpl PIC_L(ftmp) / create underflow signal 121*5d9d9091SRichard Lowe PIC_WRAPUP 122*5d9d9091SRichard Lowe jmp .return 123*5d9d9091SRichard Lowe.equal: 124*5d9d9091SRichard Lowe fstp %st(0) / C99 says to return y when x == y 125*5d9d9091SRichard Lowe jmp .return 126*5d9d9091SRichard Lowe.NaN: 127*5d9d9091SRichard Lowe faddp %st,%st(1) / x+y,x 128*5d9d9091SRichard Lowe.return: 129*5d9d9091SRichard Lowe fwait 130*5d9d9091SRichard Lowe leave 131*5d9d9091SRichard Lowe ret 132*5d9d9091SRichard Lowe .align 4 133*5d9d9091SRichard Lowe SET_SIZE(nextafter) 134