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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23 */ 24/* 25 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 .file "hypot.s" 30 31#include "libm.h" 32LIBM_ANSI_PRAGMA_WEAK(hypot,function) 33#include "libm_protos.h" 34 35 .data 36 .align 4 37inf: 38 .long 0x7f800000 39 40 ENTRY(hypot) 41 movl 8(%esp),%eax / eax <-- hi_32(x) 42 andl $0x7fffffff,%eax / eax <-- hi_32(|x|) 43 jz .x_maybe_0 / if x = +/-0, return |y| 44 subl $0x7ff00000,%eax / eax <-- hi_32(|x|) - hi_32(INF) 45 jz .x_maybe_inf 46.check_y: 47 movl 16(%esp),%eax / eax <-- hi_32(y) 48 andl $0x7fffffff,%eax / eax <-- hi_32(|y|) 49 jz .y_maybe_0 / if y = +/-0, return |x| 50 subl $0x7ff00000,%eax / eax <-- hi_32(|y|) - hi_32(INF) 51 jz .y_maybe_inf 52.do_hypot: 53 fldl 12(%esp) / ,y 54 fmul %st(0),%st / ,y*y 55 fldl 4(%esp) / x,y*y 56 fmul %st(0),%st / x*x,y*y 57 faddp %st,%st(1) / x*x+y*y 58 fsqrt / sqrt(x*x+y*y) 59 subl $8,%esp 60 fstpl (%esp) / round to double 61 fldl (%esp) / sqrt(x*x+y*y) rounded to double 62 PIC_SETUP(1) 63 flds PIC_L(inf) / inf , sqrt(x*x+y*y) 64 PIC_WRAPUP 65 addl $8,%esp 66 fucomp 67 fstsw %ax / store status in %ax 68 sahf / 80387 flags in %ah to 80386 flags 69 jz .maybe_ovflw 70 ret 71 72.maybe_ovflw: 73 jnp .ovflw 74 ret 75 76.ovflw: 77 / overflow occurred 78 fstp %st(0) / stack empty 79 pushl %ebp 80 movl %esp,%ebp 81 PIC_SETUP(2) 82 pushl $4 83 pushl 20(%ebp) / high y 84 pushl 16(%ebp) / low y 85 pushl 12(%ebp) / high x 86 pushl 8(%ebp) / low x 87 call PIC_F(_SVID_libm_err) 88 addl $20,%esp 89 PIC_WRAPUP 90 leave 91 ret 92 93.x_maybe_0: 94 movl 4(%esp),%ecx / ecx <-- lo_32(x) 95 orl %ecx,%eax / is x = +/-0? 96 jnz .check_y / branch if x is denormal 97 / x = +/-0, so return |y| 98 fldl 12(%esp) 99 fabs 100 ret 101 102.x_maybe_inf: 103 movl 4(%esp),%ecx / ecx <-- lo_32(x) 104 orl %ecx,%eax / is x = +/-INF? 105 jnz .check_y / branch if x is NaN 106 / push&pop y in case y is a SNaN 107 fldl 12(%esp) 108 fstp %st(0) 109 / x = +/-INF, so return |x| 110 fldl 4(%esp) 111 fabs 112 ret 113 114.y_maybe_0: 115 movl 12(%esp),%ecx / ecx <-- lo_32(y) 116 orl %ecx,%eax / is y = +/-0? 117 jnz .do_hypot / branch if y is denormal 118 / y = +/-0, so return |x| 119 fldl 4(%esp) 120 fabs 121 ret 122 123.y_maybe_inf: 124 movl 12(%esp),%ecx / ecx <-- lo_32(y) 125 orl %ecx,%eax / is y = +/-INF? 126 jnz .do_hypot / branch if y is NaN 127 / push&pop x in case x is a SNaN 128 fldl 4(%esp) 129 fstp %st(0) 130 / y = +/-INF, so return |y| 131 fldl 12(%esp) 132 fabs 133 ret 134 .align 4 135 SET_SIZE(hypot) 136