66 lines
2.0 KiB
ArmAsm
66 lines
2.0 KiB
ArmAsm
/*
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* Copyright © 2022 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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#if (__riscv_xlen >= 64)
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.macro bswap32_rvb out, in, count
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andi t0, \count, 4
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beqz t0, 1f
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/* Align input to 64-bit */
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lwu t0, (\in)
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addi \out, \out, 4
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rev8 t0, t0
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addi \count, \count, -1
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srli t0, t0, __riscv_xlen - 32
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addi \in, \in, 4
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sw t0, -4(\out)
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1:
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andi t3, \count, -2
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sh2add \count, \count, \out
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beqz t3, 3f
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sh2add t3, t3, \out
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2: /* 2 elements (64 bits) at a time on a 64-bit boundary */
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ld t0, (\in)
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addi \out, \out, 8
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rev8 t0, t0
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#if (__riscv_xlen == 64)
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srli t2, t0, 32
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sw t0, -4(\out)
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#else
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srli t1, t0, __riscv_xlen - 64
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srli t2, t0, __riscv_xlen - 32
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sw t1, -4(\out)
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#endif
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addi \in, \in, 8
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sw t2, -8(\out)
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bne \out, t3, 2b
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3:
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beq \out, \count, 5f
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4: /* Process last element */
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lwu t0, (\in)
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addi \out, \out, 4
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rev8 t0, t0
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addi \in, \in, 4
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srli t0, t0, __riscv_xlen - 32
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sw t0, -4(\out)
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5:
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ret
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.endm
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#endif
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