LXR qemu/include/tcg/tcg-gvec-desc.h

   1/*
   2 * Generic vector operation descriptor
   3 *
   4 * Copyright (c) 2018 Linaro
   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 <http://www.gnu.org/licenses/>.
  18 */
  19
  20#ifndef TCG_TCG_GVEC_DESC_H
  21#define TCG_TCG_GVEC_DESC_H
  22
  23/*
  24 * This configuration allows MAXSZ to represent 2048 bytes, and
  25 * OPRSZ to match MAXSZ, or represent the smaller values 8, 16, or 32.
  26 *
  27 * Encode this with:
  28 *   0, 1, 3 -> 8, 16, 32
  29 *   2       -> maxsz
  30 *
  31 * This steals the input that would otherwise map to 24 to match maxsz.
  32 */
  33#define SIMD_MAXSZ_SHIFT   0
  34#define SIMD_MAXSZ_BITS    8
  35
  36#define SIMD_OPRSZ_SHIFT   (SIMD_MAXSZ_SHIFT + SIMD_MAXSZ_BITS)
  37#define SIMD_OPRSZ_BITS    2
  38
  39#define SIMD_DATA_SHIFT    (SIMD_OPRSZ_SHIFT + SIMD_OPRSZ_BITS)
  40#define SIMD_DATA_BITS     (32 - SIMD_DATA_SHIFT)
  41
  42/* Create a descriptor from components.  */
  43uint32_t simd_desc(uint32_t oprsz, uint32_t maxsz, int32_t data);
  44
  45/* Extract the max vector size from a descriptor.  */
  46static inline intptr_t simd_maxsz(uint32_t desc)
  47{
  48    return extract32(desc, SIMD_MAXSZ_SHIFT, SIMD_MAXSZ_BITS) * 8 + 8;
  49}
  50
  51/* Extract the operation size from a descriptor.  */
  52static inline intptr_t simd_oprsz(uint32_t desc)
  53{
  54    uint32_t f = extract32(desc, SIMD_OPRSZ_SHIFT, SIMD_OPRSZ_BITS);
  55    intptr_t o = f * 8 + 8;
  56    intptr_t m = simd_maxsz(desc);
  57    return f == 2 ? m : o;
  58}
  59
  60/* Extract the operation-specific data from a descriptor.  */
  61static inline int32_t simd_data(uint32_t desc)
  62{
  63    return sextract32(desc, SIMD_DATA_SHIFT, SIMD_DATA_BITS);
  64}
  65
  66#endif
  67