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| /* | |
| * Copyright © 2022 Rémi Denis-Courmont. | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * FFmpeg is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| #include "config.h" | |
| #include "libavutil/riscv/asm.S" | |
| #if (__riscv_xlen >= 64) | |
| func ff_bswap32_buf_rvb, zbb | |
| andi t0, a1, 4 | |
| beqz t0, 1f | |
| /* Align a1 (input) to 64-bit */ | |
| lwu t0, (a1) | |
| addi a0, a0, 4 | |
| rev8 t0, t0 | |
| addi a2, a2, -1 | |
| srli t0, t0, __riscv_xlen - 32 | |
| addi a1, a1, 4 | |
| sw t0, -4(a0) | |
| 1: | |
| andi a3, a2, -2 | |
| sh2add a2, a2, a0 | |
| beqz a3, 3f | |
| sh2add a3, a3, a0 | |
| 2: /* 2 elements (64 bits) at a time on a 64-bit boundary */ | |
| ld t0, (a1) | |
| addi a0, a0, 8 | |
| rev8 t0, t0 | |
| #if (__riscv_xlen == 64) | |
| srli t2, t0, 32 | |
| sw t0, -4(a0) | |
| #else | |
| srli t1, t0, __riscv_xlen - 64 | |
| srli t2, t0, __riscv_xlen - 32 | |
| sw t1, -4(a0) | |
| #endif | |
| addi a1, a1, 8 | |
| sw t2, -8(a0) | |
| bne a0, a3, 2b | |
| 3: | |
| beq a0, a2, 5f | |
| 4: /* Process last element */ | |
| lwu t0, (a1) | |
| addi a0, a0, 4 | |
| rev8 t0, t0 | |
| addi a1, a1, 4 | |
| srli t0, t0, __riscv_xlen - 32 | |
| sw t0, -4(a0) | |
| 5: | |
| ret | |
| endfunc | |
| #endif | |