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. */
simd_maxsz(uint32_t desc)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. */
simd_oprsz(uint32_t desc)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. */
simd_data(uint32_t desc)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
67