1/*- 2 * Copyright (c) 2012 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 32#ifdef _ARM_ARCH_7 33 34RCSID("$NetBSD: neon_mask.S,v 1.2 2012/12/18 06:14:23 matt Exp $") 35 36/* 37 * __neon_loading_qword_bitmask(size_t len); 38 * IN r0 = length of mask in bits 39 * OUT q0 = mask 40 */ 41ENTRY(__neon_leading_qword_bitmask) 42 cmp r0, #64 /* which dword is partial? */ 43#ifdef __ARMEL__ 44 sublt r0, r0, #64 /* 1st dword needs MSBs cleared */ 45 subge r1, r0, #128 /* 2nd dword needs MSBs cleared */ 46#else 47 rsblt r0, r0, #64 /* 1st dword needs LSBs cleared */ 48 rsbge r1, r0, #128 /* 2nd dword needs LSBs cleared */ 49#endif 50 movge r0, #0 /* 1st dword needs to left alone */ 51 movlt r1, #64 /* 2st dword needs to be cleared */ 52 vmov d2, r0, r1 /* move dword shifts to SIMD */ 53 vmovl.u32 q1, d2 /* 2 U32 -> 2 U64 */ 54 vmvn.u64 q0, #0 /* create a mask */ 55 vshl.u64 q0, q0, q1 /* shift out unneeded bytes */ 56 RET 57END(__neon_leading_qword_bitmask) 58 59#endif /* _ARM_ARCH_7 */ 60