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 /* 23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24 */ 25 /* 26 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #pragma weak __csqrtf = csqrtf 31 32 #include "libm.h" /* sqrt/fabsf/sqrtf */ 33 #include "complex_wrapper.h" 34 35 /* INDENT OFF */ 36 static const float zero = 0.0F; 37 /* INDENT ON */ 38 39 fcomplex 40 csqrtf(fcomplex z) { 41 fcomplex ans; 42 double dt, dx, dy; 43 float x, y, t, ax, ay, w; 44 int ix, iy, hx, hy; 45 46 x = F_RE(z); 47 y = F_IM(z); 48 hx = THE_WORD(x); 49 hy = THE_WORD(y); 50 ix = hx & 0x7fffffff; 51 iy = hy & 0x7fffffff; 52 ay = fabsf(y); 53 ax = fabsf(x); 54 if (ix >= 0x7f800000 || iy >= 0x7f800000) { 55 /* x or y is Inf or NaN */ 56 if (iy == 0x7f800000) 57 F_IM(ans) = F_RE(ans) = ay; 58 else if (ix == 0x7f800000) { 59 if (hx > 0) { 60 F_RE(ans) = ax; 61 F_IM(ans) = ay * zero; 62 } else { 63 F_RE(ans) = ay * zero; 64 F_IM(ans) = ax; 65 } 66 } else 67 F_IM(ans) = F_RE(ans) = ax + ay; 68 } else if (iy == 0) { 69 if (hx >= 0) { 70 F_RE(ans) = sqrtf(ax); 71 F_IM(ans) = zero; 72 } else { 73 F_IM(ans) = sqrtf(ax); 74 F_RE(ans) = zero; 75 } 76 } else { 77 dx = (double) ax; 78 dy = (double) ay; 79 dt = sqrt(0.5 * (sqrt(dx * dx + dy * dy) + dx)); 80 t = (float) dt; 81 w = (float) (dy / (dt + dt)); 82 if (hx >= 0) { 83 F_RE(ans) = t; 84 F_IM(ans) = w; 85 } else { 86 F_IM(ans) = t; 87 F_RE(ans) = w; 88 } 89 } 90 if (hy < 0) 91 F_IM(ans) = -F_IM(ans); 92 return (ans); 93 } 94