1/*- 2 * Copyright (c) 2011 The NetBSD Foundation, Inc. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to The NetBSD Foundation 6 * by Matt Thomas of 3am Software Foundry. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30#include <machine/asm.h> 31#include <sys/errno.h> 32 33RCSID("$NetBSD$") 34 35ENTRY(scalbnf, 0) 36 cvtfd 4(%ap), %r0 37 movl 8(%ap), %r2 38 jr 1f 39 40ALTENTRY(scalbnl) 41ENTRY(scalbn, 0) 42 movd 4(%ap), %r0 43 movl 12(%ap), %r2 44 45 /* 46 * First see if the result will be within bounds 47 */ 481: cmpl %r2,$(256+55) 49 jgeq overflow 50 cmpl %r2,$-(256+55) 51 jleq underflow 52 53 extzv $7, $9, %r0, %r3 /* extract exponent */ 54 jneq 5f /* 0 * N is still 0 */ 55 cmpw %r3, $-256 /* is this a NAN? */ 56 jgtr 2f /* nope */ 57 ret 58 592: movzbl %r3, %r3 /* clear sign bit */ 60 addl2 %r2, %r3 /* add to exponent */ 61 jleq underflow /* <= 0? */ 62 633: jbs $8, %r3, overflow /* did exponent overflow? */ 64 insv $7, $8, %r3, %r0 /* replace exponent */ 65 ret 66 67underflow: 68 clrq %r0 /* return 0.0 */ 69 jr copysign /* or mabye -0.0 */ 70overflow: 71 pushl $ERANGE /* overflow */ 72 calls $1, _C_LABEL(infnan) /* possibly signal */ 73copysign: 74 jbc $15, 4(%ap), 5f /* if clear, don't set sign-bit */ 75 bisw2 $0x8000, %r0 /* preserve sign-bit */ 765: 77 ret 78