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1551f6be9d
With larger vector sizes, it turns out oprsz == maxsz, and we only need to represent mismatch for oprsz <= 32. We do, however, need to represent larger oprsz and do so without reducing SIMD_DATA_BITS. Reduce the size of the oprsz field and increase the maxsz field. Steal the oprsz value of 24 to indicate equality with maxsz. Backports e2e7168a214b0ed98dc357bba96816486a289762
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/*
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* Generic vector operation descriptor
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*
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* Copyright (c) 2018 Linaro
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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 <http://www.gnu.org/licenses/>.
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*/
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#ifndef TCG_TCG_GVEC_DESC_H
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#define TCG_TCG_GVEC_DESC_H
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/*
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* This configuration allows MAXSZ to represent 2048 bytes, and
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* OPRSZ to match MAXSZ, or represent the smaller values 8, 16, or 32.
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*
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* Encode this with:
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* 0, 1, 3 -> 8, 16, 32
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* 2 -> maxsz
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*
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* This steals the input that would otherwise map to 24 to match maxsz.
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*/
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#define SIMD_MAXSZ_SHIFT 0
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#define SIMD_MAXSZ_BITS 8
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#define SIMD_OPRSZ_SHIFT (SIMD_MAXSZ_SHIFT + SIMD_MAXSZ_BITS)
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#define SIMD_OPRSZ_BITS 2
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#define SIMD_DATA_SHIFT (SIMD_OPRSZ_SHIFT + SIMD_OPRSZ_BITS)
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#define SIMD_DATA_BITS (32 - SIMD_DATA_SHIFT)
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/* Create a descriptor from components. */
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uint32_t simd_desc(uint32_t oprsz, uint32_t maxsz, int32_t data);
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/* Extract the max vector size from a descriptor. */
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static inline intptr_t simd_maxsz(uint32_t desc)
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{
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return extract32(desc, SIMD_MAXSZ_SHIFT, SIMD_MAXSZ_BITS) * 8 + 8;
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}
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/* Extract the operation size from a descriptor. */
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static inline intptr_t simd_oprsz(uint32_t desc)
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{
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uint32_t f = extract32(desc, SIMD_OPRSZ_SHIFT, SIMD_OPRSZ_BITS);
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intptr_t o = f * 8 + 8;
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intptr_t m = simd_maxsz(desc);
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return f == 2 ? m : o;
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}
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/* Extract the operation-specific data from a descriptor. */
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static inline int32_t simd_data(uint32_t desc)
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{
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return sextract32(desc, SIMD_DATA_SHIFT, SIMD_DATA_BITS);
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}
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#endif
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