[FFmpeg-devel] [PATCH v2 2/4] lavc/vp8dsp: R-V V loop_filter_simple

[uk7b@foxmail.com]

From: sunyuechi <sunyuechi@iscas.ac.cn>

                                                     C908   X60
vp8_loop_filter_simple_h_c                         :    6.2    5.7
vp8_loop_filter_simple_h_rvv_i32                   :    3.0    2.5
vp8_loop_filter_simple_v_c                         :    6.5    6.2
vp8_loop_filter_simple_v_rvv_i32                   :    2.0    1.5
---
 libavcodec/riscv/vp8dsp_init.c | 18 +++++++-
 libavcodec/riscv/vp8dsp_rvv.S  | 77 ++++++++++++++++++++++++++++++++++
 2 files changed, 94 insertions(+), 1 deletion(-)

diff --git a/libavcodec/riscv/vp8dsp_init.c b/libavcodec/riscv/vp8dsp_init.c
index dcb6307d5b..8c5b2c8b04 100644
--- a/libavcodec/riscv/vp8dsp_init.c
+++ b/libavcodec/riscv/vp8dsp_init.c
@@ -49,6 +49,9 @@ VP8_BILIN(16, rvv256);
 VP8_BILIN(8,  rvv256);
 VP8_BILIN(4,  rvv256);
 
+VP8_LF(rvv128);
+VP8_LF(rvv256);
+
 av_cold void ff_vp78dsp_init_riscv(VP8DSPContext *c)
 {
 #if HAVE_RV
@@ -147,9 +150,15 @@ av_cold void ff_vp78dsp_init_riscv(VP8DSPContext *c)
 av_cold void ff_vp8dsp_init_riscv(VP8DSPContext *c)
 {
 #if HAVE_RVV
+    int vlenb = ff_get_rv_vlenb();
+
+#define init_loop_filter(vlen)                                           \
+    c->vp8_v_loop_filter_simple = ff_vp8_v_loop_filter16_simple_rvv##vlen; \
+    c->vp8_h_loop_filter_simple = ff_vp8_h_loop_filter16_simple_rvv##vlen;
+
     int flags = av_get_cpu_flags();
 
-    if (flags & AV_CPU_FLAG_RVV_I32 && ff_rv_vlen_least(128)) {
+    if (flags & AV_CPU_FLAG_RVV_I32 && vlenb >= 16) {
 #if __riscv_xlen >= 64
         if (flags & AV_CPU_FLAG_RVV_I64)
             c->vp8_luma_dc_wht = ff_vp8_luma_dc_wht_rvv;
@@ -159,6 +168,13 @@ av_cold void ff_vp8dsp_init_riscv(VP8DSPContext *c)
         c->vp8_idct_dc_add4y = ff_vp8_idct_dc_add4y_rvv;
         if (flags & AV_CPU_FLAG_RVV_I64)
             c->vp8_idct_dc_add4uv = ff_vp8_idct_dc_add4uv_rvv;
+
+        if (vlenb >= 32) {
+            init_loop_filter(256);
+        } else {
+            init_loop_filter(128);
+        }
     }
+#undef init_loop_filter
 #endif
 }
diff --git a/libavcodec/riscv/vp8dsp_rvv.S b/libavcodec/riscv/vp8dsp_rvv.S
index 0cbf1672f7..3cec4dd135 100644
--- a/libavcodec/riscv/vp8dsp_rvv.S
+++ b/libavcodec/riscv/vp8dsp_rvv.S
@@ -275,6 +275,83 @@ func ff_vp78_idct_dc_add4uv_rvv, zve64x
         ret
 endfunc
 
+.macro filter_fmin len, vlen, a, f1, p0f2, q0f1, p0, q0
+        vsetvlstatic16  \len, \vlen
+        vsext.vf2       \q0f1, \a
+        vmin.vx         \p0f2, \q0f1, a6
+        vmin.vx         \q0f1, \q0f1, t6
+        vadd.vi         \p0f2, \p0f2, 3
+        vadd.vi         \q0f1, \q0f1, 4
+        vsra.vi         \p0f2, \p0f2, 3
+        vsra.vi         \f1,   \q0f1, 3
+        vadd.vv         \p0f2, \p0f2, \p0
+        vsub.vv         \q0f1, \q0, \f1
+        vmax.vx         \p0f2, \p0f2, zero
+        vmax.vx         \q0f1, \q0f1, zero
+.endm
+
+.macro filter len, vlen, type, normal, inner, dst, stride, fE, fI, thresh
+.ifc \type,v
+        sub             t3, \dst, \stride      // -1
+        sub             t2, t3, \stride        // -2
+        add             t4, \dst, \stride      // 1
+        vle8.v          v3, (t2)               // p1
+        vle8.v          v4, (t3)               // p0
+        vle8.v          v5, (\dst)             // q0
+        vle8.v          v6, (t4)               // q1
+.else
+        addi            t2, \dst, -2
+        addi            t3, \dst, -1
+        vlsseg4e8.v     v3, (t2), \stride
+.endif
+        vwsubu.vv       v10, v3, v6             // p1-q1
+        vwsubu.vv       v12, v5, v4             // q0-p0
+
+        vnclip.wi       v16, v10, 0             // clip_int8(p1 - q1)
+        vsetvlstatic16  \len, \vlen
+        // vp8_simple_limit(dst + i, stride, flim)
+        li              a6, 2
+        vneg.v          v22, v10
+        vneg.v          v24, v12
+        vmax.vv         v22, v22, v10
+        vmax.vv         v24, v24, v12
+        vsrl.vi         v22, v22, 1
+        vmacc.vx        v22, a6, v24
+        vmsleu.vx       v0, v22, \fE
+
+        li              a7, 3
+        li              a6, 124
+        li              t6, 123
+        vmul.vx         v22, v12, a7            // 3 * (q0 - p0)
+        vzext.vf2       v24, v4                 // p0
+        vzext.vf2       v20, v5                 // q0
+        vsetvlstatic8   \len, \vlen
+        vwadd.wv        v10, v22, v16
+        vnclip.wi       v28, v10, 0
+        filter_fmin     \len, \vlen, v28, v12, v26, v10, v24, v20
+        vsetvlstatic8   \len, \vlen
+        vnclipu.wi      v30, v26, 0
+        vnclipu.wi      v31, v10, 0
+.ifc \type,v
+        vse8.v          v30, (t3), v0.t
+        vse8.v          v31, (\dst), v0.t
+.else
+        vssseg2e8.v     v30, (t3), \stride, v0.t
+.endif
+
+.endm
+
+.irp type,v,h
+.irp vlen,256,128
+func ff_vp8_\type\()_loop_filter16_simple_rvv\vlen, zve32x
+        csrwi           vxrm, 0
+        vsetvlstatic8   16, \vlen
+        filter 16, \vlen, \type, 0, 0, a0, a1, a2, a3, a4
+        ret
+endfunc
+.endr
+.endr
+
 .macro bilin_load_h dst mn
         addi            t5, a2, 1
         vle8.v          \dst, (a2)
-- 
2.45.2

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