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.  */
  43 uint32_t simd_desc(uint32_t oprsz, uint32_t maxsz, int32_t data);
  44
  45 /* Extract the max vector size from a descriptor.  */
  46 static 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.  */
  52 static 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.  */
  61 static inline int32_t simd_data(uint32_t desc)
  62 {
  63     return sextract32(desc, SIMD_DATA_SHIFT, SIMD_DATA_BITS);
  64 }
  65
  66 #endif