target-tilegx/helper.c

   1 /*
   2  * QEMU TILE-Gx helpers
   3  *
   4  *  Copyright (c) 2015 Chen Gang
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see
  18  * <http://www.gnu.org/licenses/lgpl-2.1.html>
  19  */
  20
  21 #include "cpu.h"
  22 #include "qemu-common.h"
  23 #include "exec/helper-proto.h"
  24
  25 void helper_exception(CPUTLGState *env, uint32_t excp)
  26 {
  27     CPUState *cs = CPU(tilegx_env_get_cpu(env));
  28
  29     cs->exception_index = excp;
  30     cpu_loop_exit(cs);
  31 }
  32
  33 uint64_t helper_cntlz(uint64_t arg)
  34 {
  35     return clz64(arg);
  36 }
  37
  38 uint64_t helper_cnttz(uint64_t arg)
  39 {
  40     return ctz64(arg);
  41 }
  42
  43 uint64_t helper_pcnt(uint64_t arg)
  44 {
  45     return ctpop64(arg);
  46 }
  47
  48 uint64_t helper_revbits(uint64_t arg)
  49 {
  50     return revbit64(arg);
  51 }
  52
  53 /*
  54  * Functional Description
  55  *     uint64_t a = rf[SrcA];
  56  *     uint64_t b = rf[SrcB];
  57  *     uint64_t d = rf[Dest];
  58  *     uint64_t output = 0;
  59  *     unsigned int counter;
  60  *     for (counter = 0; counter < (WORD_SIZE / BYTE_SIZE); counter++)
  61  *     {
  62  *         int sel = getByte (b, counter) & 0xf;
  63  *         uint8_t byte = (sel < 8) ? getByte (d, sel) : getByte (a, (sel - 8));
  64  *         output = setByte (output, counter, byte);
  65  *     }
  66  *     rf[Dest] = output;
  67  */
  68 uint64_t helper_shufflebytes(uint64_t dest, uint64_t srca, uint64_t srcb)
  69 {
  70     uint64_t vdst = 0;
  71     int count;
  72
  73     for (count = 0; count < 64; count += 8) {
  74         uint64_t sel = srcb >> count;
  75         uint64_t src = (sel & 8) ? srca : dest;
  76         vdst |= extract64(src, (sel & 7) * 8, 8) << count;
  77     }
  78
  79     return vdst;
  80 }