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 fminf = __fminf 31 32 #include "libm.h" /* for islessequal macro */ 33 34 float 35 __fminf(float x, float y) { 36 /* 37 * On SPARC v8plus/v9, this could be implemented as follows 38 * (assuming %f0 = x, %f1 = y, return value left in %f0): 39 * 40 * fcmps %fcc0,%f1,%f1 41 * fmovsu %fcc0,%f0,%f1 42 * fcmps %fcc0,%f0,%f1 43 * fmovsug %fcc0,%f1,%f0 44 * st %f0,[x] 45 * st %f1,[y] 46 * ld [x],%l0 47 * ld [y],%l1 48 * or %l0,%l1,%l2 49 * sethi %hi(0x80000000),%l3 50 * and %l3,%l2,%l2 51 * or %l0,%l2,%l0 52 * st %l0,[x] 53 * ld [x],%f0 54 * 55 * If VIS instructions are available, use this code instead: 56 * 57 * fcmps %fcc0,%f1,%f1 58 * fmovsu %fcc0,%f0,%f1 59 * fcmps %fcc0,%f0,%f1 60 * fmovsug %fcc0,%f1,%f0 61 * fors %f0,%f1,%f2 62 * fzeros %f3 63 * fnegs %f3,%f3 64 * fands %f3,%f2,%f2 65 * fors %f0,%f2,%f0 66 * 67 * If VIS 3.0 instructions are available, use this: 68 * 69 * flcmps %fcc0,%f0,%f1 70 * fmovsge %fcc0,%f1,%f0 ! move if %fcc0 is 0 or 2 71 */ 72 73 union { 74 unsigned i; 75 float f; 76 } xx, yy; 77 unsigned s; 78 79 /* if y is nan, replace it by x */ 80 if (y != y) 81 y = x; 82 83 /* if x is nan, replace it by y */ 84 if (x != x) 85 x = y; 86 87 /* At this point, x and y are either both numeric, or both NaN */ 88 if (!isnan(x) && !islessequal(x, y)) 89 x = y; 90 91 /* 92 * set the sign of the result if either x or y has its sign set 93 */ 94 xx.f = x; 95 yy.f = y; 96 s = (xx.i | yy.i) & 0x80000000; 97 xx.i |= s; 98 99 return (xx.f); 100 } 101