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59 lines
1.6 KiB
59 lines
1.6 KiB
/* |
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* Copyright © 2023 Rémi Denis-Courmont. |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "config.h" |
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#include "libavutil/riscv/asm.S" |
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func ff_ac3_exponent_min_rvb, zbb |
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beqz a1, 3f |
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1: |
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addi a2, a2, -1 |
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lb t3, (a0) |
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addi t0, a0, 256 |
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mv t1, a1 |
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2: |
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lb t4, (t0) |
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addi t1, t1, -1 |
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addi t0, t0, 256 |
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minu t3, t3, t4 |
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bnez t1, 2b |
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sb t3, (a0) |
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addi a0, a0, 1 |
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bnez a2, 1b |
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3: |
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ret |
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endfunc |
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func ff_extract_exponents_rvb, zbb |
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1: |
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lw t0, (a1) |
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addi a0, a0, 1 |
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neg t1, t0 |
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addi a1, a1, 4 |
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max t0, t0, t1 |
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addi a2, a2, -1 |
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clz t0, t0 |
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addi t0, t0, 24 - __riscv_xlen |
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sb t0, -1(a0) |
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bgtz a2, 1b |
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ret |
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endfunc
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