Module Name: src Committed By: matt Date: Mon Dec 17 00:46:14 UTC 2012
Added Files: src/common/lib/libc/arch/arm/gen: neon_mask.S Log Message: Add a routine to create an up to an 128 bitmask returned in VFP/NEON q0 starting at the rightmost bit (bit 0). To generate a diff of this commit: cvs rdiff -u -r0 -r1.1 src/common/lib/libc/arch/arm/gen/neon_mask.S Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.
Added files: Index: src/common/lib/libc/arch/arm/gen/neon_mask.S diff -u /dev/null src/common/lib/libc/arch/arm/gen/neon_mask.S:1.1 --- /dev/null Mon Dec 17 00:46:14 2012 +++ src/common/lib/libc/arch/arm/gen/neon_mask.S Mon Dec 17 00:46:14 2012 @@ -0,0 +1,60 @@ +/*- + * Copyright (c) 2012 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Matt Thomas of 3am Software Foundry. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <machine/asm.h> +#include "assym.h" + +#ifdef _ARM_ARCH_7 + +RCSID("$NetBSD: neon_mask.S,v 1.1 2012/12/17 00:46:14 matt Exp $") + +/* + * __neon_loading_qword_bitmask(size_t len); + * IN r0 = length of mask in bits + * OUT q0 = mask + */ +ENTRY(__neon_leading_qword_bitmask) + cmp r0, #64 /* which dword is partial? */ +#ifdef __ARMEL__ + sublt r0, r0, #64 /* 1st dword needs MSBs cleared */ + subge r1, r0, #128 /* 2nd dword needs MSBs cleared */ +#else + rsblt r0, r0 #64 /* 1st dword needs LSBs cleared */ + rsbge r1, r0, #128 /* 2nd dword needs LSBs cleared */ +#endif + movge r0, #0 /* 1st dword needs to left alone */ + movlt r1, #64 /* 2st dword needs to be cleared */ + vmov d2, r0, r1 /* move dword shifts to SIMD */ + vmovl.u32 q1, d2 /* 2 U32 -> 2 U64 */ + vmvn.u64 q0, #0 /* create a mask */ + vshl.u64 q0, q0, q1 /* shift out unneeded bytes */ + RET +END(__neon_leading_qword_bitmask) + +#endif /* _ARM_ARCH_7 */