mirror of https://gitee.com/openkylin/qemu.git
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
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/*
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* QEMU TILE-Gx helpers
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*
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* Copyright (c) 2015 Chen Gang
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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 2.1 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
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* <http://www.gnu.org/licenses/lgpl-2.1.html>
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*/
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#include "cpu.h"
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#include "qemu-common.h"
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#include "exec/helper-proto.h"
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void helper_exception(CPUTLGState *env, uint32_t excp)
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{
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CPUState *cs = CPU(tilegx_env_get_cpu(env));
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cs->exception_index = excp;
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cpu_loop_exit(cs);
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}
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uint64_t helper_cntlz(uint64_t arg)
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{
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return clz64(arg);
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}
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uint64_t helper_cnttz(uint64_t arg)
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{
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return ctz64(arg);
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}
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/*
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* Functional Description
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* uint64_t a = rf[SrcA];
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* uint64_t b = rf[SrcB];
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* uint64_t d = rf[Dest];
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* uint64_t output = 0;
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* unsigned int counter;
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* for (counter = 0; counter < (WORD_SIZE / BYTE_SIZE); counter++)
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* {
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* int sel = getByte (b, counter) & 0xf;
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* uint8_t byte = (sel < 8) ? getByte (d, sel) : getByte (a, (sel - 8));
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* output = setByte (output, counter, byte);
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* }
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* rf[Dest] = output;
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*/
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uint64_t helper_shufflebytes(uint64_t dest, uint64_t srca, uint64_t srcb)
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{
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uint64_t vdst = 0;
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int count;
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for (count = 0; count < 64; count += 8) {
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uint64_t sel = srcb >> count;
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uint64_t src = (sel & 8) ? srca : dest;
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vdst |= extract64(src, (sel & 7) * 8, 8) << count;
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}
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return vdst;
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}
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