82e14b02a2
This adds support for the C5.6.147 RBIT instruction.
Signed-off-by: Alexander Graf <agraf@suse.de>
[claudio: adapted to new decoder, use bswap64,
make RBIT part standalone from the rest of the patch,
splitting REV into a separate patch]
Signed-off-by: Claudio Fontana <claudio.fontana@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/*
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* AArch64 specific helpers
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*
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* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "cpu.h"
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#include "exec/gdbstub.h"
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#include "helper.h"
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#include "qemu/host-utils.h"
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#include "sysemu/sysemu.h"
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#include "qemu/bitops.h"
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/* C2.4.7 Multiply and divide */
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/* special cases for 0 and LLONG_MIN are mandated by the standard */
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uint64_t HELPER(udiv64)(uint64_t num, uint64_t den)
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{
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if (den == 0) {
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return 0;
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}
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return num / den;
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}
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int64_t HELPER(sdiv64)(int64_t num, int64_t den)
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{
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if (den == 0) {
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return 0;
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}
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if (num == LLONG_MIN && den == -1) {
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return LLONG_MIN;
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}
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return num / den;
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}
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uint64_t HELPER(clz64)(uint64_t x)
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{
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return clz64(x);
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}
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uint64_t HELPER(rbit64)(uint64_t x)
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{
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/* assign the correct byte position */
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x = bswap64(x);
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/* assign the correct nibble position */
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x = ((x & 0xf0f0f0f0f0f0f0f0ULL) >> 4)
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| ((x & 0x0f0f0f0f0f0f0f0fULL) << 4);
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/* assign the correct bit position */
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x = ((x & 0x8888888888888888ULL) >> 3)
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| ((x & 0x4444444444444444ULL) >> 1)
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| ((x & 0x2222222222222222ULL) << 1)
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| ((x & 0x1111111111111111ULL) << 3);
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return x;
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}
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