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 */
