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lavc/bswapdsp: rewrite RISC-V V bswap16

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This favours bit-wise logic over slow strided stores.
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Rémi Denis-Courmont
2023-07-16 16:55:30 +03:00
parent b6585eb04c
commit 5de1db5370
1 changed files with 10 additions and 11 deletions
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21
libavcodec/riscv/bswapdsp_rvv.S
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@@ -45,18 +45,17 @@ func ff_bswap32_buf_rvv, zve32x
endfunc endfunc
func ff_bswap16_buf_rvv, zve32x func ff_bswap16_buf_rvv, zve32x
li t2, 2
addi t1, a0, 1
1: 1:
vsetvli t0, a2, e8, m1, ta, ma vsetvli t0, a2, e16, m8, ta, ma
vlseg2e8.v v8, (a1) vle16.v v8, (a1)
sub a2, a2, t0 sub a2, a2, t0
sh1add a1, t0, a1 vsll.vi v16, v8, 8
vsse8.v v8, (t1), t2 sh1add a1, t0, a1
sh1add t1, t0, t1 vsrl.vi v24, v8, 8
vsse8.v v9, (a0), t2 vor.vv v8, v16, v24
sh1add a0, t0, a0 vse16.v v8, (a0)
bnez a2, 1b sh1add a0, t0, a0
bnez a2, 1b
ret ret
endfunc endfunc