60 lines
1.7 KiB
ArmAsm
60 lines
1.7 KiB
ArmAsm
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/* Copyright (C) 2014-2022 Free Software Foundation, Inc.
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Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This file is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>.
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(al + C * ah) * (bl + C * bh) = al * bl
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+ C * ah * bl
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+ C * al * bh
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+ C * C * ah * bh -> discard, overflow
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Where C=(1 << 32)
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*/
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#include "pru-asm.h"
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.section .text.__pruabi_mpyll, "ax"
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.global SYM(__pruabi_mpyll)
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FUNC(__pruabi_mpyll)
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SYM(__pruabi_mpyll):
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/* + C * ah * bl */
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mov r28, r15
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mov r29, r16
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nop
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xin 0, r26, 8
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/* + C * al * bh */
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mov r28, r14
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mov r29, r17
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mov r15, r26 /* "Loose" ah, record only reslo. */
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xin 0, r26, 8
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/* + al * bl */
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/* mov r28, r14 -> No need, already loaded. */
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mov r29, r16
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add r15, r15, r26
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xin 0, r26, 8
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mov r14, r26
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add r15, r15, r27
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ret
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ENDFUNC(__pruabi_mpyll)
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