0a6a1f1d05
This brings our tree to NetBSD 7.0, as found on -current on the 10-10-2015. This updates: - LLVM to 3.6.1 - GCC to GCC 5.1 - Replace minix/commands/zdump with usr.bin/zdump - external/bsd/libelf has moved to /external/bsd/elftoolchain/ - Import ctwm - Drop sprintf from libminc Change-Id: I149836ac18e9326be9353958bab9b266efb056f0
75 lines
2.4 KiB
ArmAsm
75 lines
2.4 KiB
ArmAsm
/* $NetBSD: mulsi3.S,v 1.1 2014/09/03 19:34:25 matt Exp $ */
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/*-
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* Copyright (c) 2014 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas of 3am Software Foundry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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__RCSID("$NetBSD: mulsi3.S,v 1.1 2014/09/03 19:34:25 matt Exp $")
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ENTRY(__mulsi3)
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l.movhi r11, 0
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l.sfeqi r3, 0
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l.bf .Lret
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l.nop
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l.sfeqi r4, 0
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l.bf .Lret
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l.nop
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l.sfleu r3, r4 # is r3 < r4 (unsigned)
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#if 0
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l.ori r6, r3, 0 # move r3 to r6
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l.bf .Lloop # yes, r6 already has smaller value,
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l.nop
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l.ori r6, r4, 0 # move r4 to r6 because it's smaller than r3
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#else
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l.cmov r6, r3, r4 # choose lesser of r3 or r4
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#endif
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.Lloop:
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l.andi r5, r6, 1 # get LSB
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l.sub r8, r0, r5 # 0 -> 0, 1 -> 0xffffffff
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l.and r8, r8, r4 # r8 = r6 & 1 ? r4 : 0
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l.add r11, r11, r8 # add to result
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l.srli r4, r4, 1 # discard LSB
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l.slli r6, r6, 1 # multiply by 2
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.Lentry:
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l.sfeqi r4, 0 # only 0 left?
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l.bf .Lret # yes, we're done
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l.nop
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l.sfeqi r6, 0 # only 0 left?
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l.bnf .Lloop # no, another round of long multiplication.
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l.nop
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.Lret: l.jr lr
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l.nop
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END(__mulsi3)
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