[FFmpeg-cvslog] lavc/bswapdsp: RISC-V V bswap16_buf

[Rémi Denis-Courmont]

ffmpeg | branch: master | Rémi Denis-Courmont <remi at remlab.net> | Sun Oct  2 14:55:01 2022 +0300| [2abafd7307d5ba31cc6492539caf0da15dd808a5] | committer: Lynne

lavc/bswapdsp: RISC-V V bswap16_buf

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2abafd7307d5ba31cc6492539caf0da15dd808a5
---

 libavcodec/riscv/bswapdsp_init.c |  5 ++++-
 libavcodec/riscv/bswapdsp_rvv.S  | 17 +++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/libavcodec/riscv/bswapdsp_init.c b/libavcodec/riscv/bswapdsp_init.c
index c17b6b75bb..abe84ec1f7 100644
--- a/libavcodec/riscv/bswapdsp_init.c
+++ b/libavcodec/riscv/bswapdsp_init.c
@@ -27,6 +27,7 @@
 
 void ff_bswap32_buf_rvb(uint32_t *dst, const uint32_t *src, int len);
 void ff_bswap32_buf_rvv(uint32_t *dst, const uint32_t *src, int len);
+void ff_bswap16_buf_rvv(uint16_t *dst, const uint16_t *src, int len);
 
 av_cold void ff_bswapdsp_init_riscv(BswapDSPContext *c)
 {
@@ -37,7 +38,9 @@ av_cold void ff_bswapdsp_init_riscv(BswapDSPContext *c)
         c->bswap_buf = ff_bswap32_buf_rvb;
 #endif
 #if HAVE_RVV
-    if (cpu_flags & AV_CPU_FLAG_RVV_I32)
+    if (cpu_flags & AV_CPU_FLAG_RVV_I32) {
         c->bswap_buf = ff_bswap32_buf_rvv;
+        c->bswap16_buf = ff_bswap16_buf_rvv;
+    }
 #endif
 }
diff --git a/libavcodec/riscv/bswapdsp_rvv.S b/libavcodec/riscv/bswapdsp_rvv.S
index 7ea747b3ce..ef2999c1be 100644
--- a/libavcodec/riscv/bswapdsp_rvv.S
+++ b/libavcodec/riscv/bswapdsp_rvv.S
@@ -43,3 +43,20 @@ func ff_bswap32_buf_rvv, zve32x
 
         ret
 endfunc
+
+func ff_bswap16_buf_rvv, zve32x
+        li      t2, 2
+        addi    t1, a0, 1
+1:
+        vsetvli    t0, a2, e8, m1, ta, ma
+        vlseg2e8.v v8, (a1)
+        sub        a2, a2, t0
+        sh1add     a1, t0, a1
+        vsse8.v    v8, (t1), t2
+        sh1add     t1, t0, t1
+        vsse8.v    v9, (a0), t2
+        sh1add     a0, t0, a0
+        bnez       a2, 1b
+
+        ret
+endfunc