lavc/sbrdsp: R-V V sum_square

sum_square_c:       803.5
sum_square_rvv_f32: 283.2

libavcodec/riscv/sbrdsp_init.c

@@ -24,6 +24,7 @@
 #include "libavcodec/sbrdsp.h"
 
 void ff_sbr_sum64x5_rvv(float *z);
+float ff_sbr_sum_square_rvv(float (*x)[2], int n);
 
 av_cold void ff_sbrdsp_init_riscv(SBRDSPContext *c)
 {
@@ -32,6 +33,7 @@ av_cold void ff_sbrdsp_init_riscv(SBRDSPContext *c)
 
     if ((flags & AV_CPU_FLAG_RVV_F32) && (flags & AV_CPU_FLAG_RVB_ADDR)) {
         c->sum64x5 = ff_sbr_sum64x5_rvv;
+        c->sum_square = ff_sbr_sum_square_rvv;
     }
 #endif
 }

libavcodec/riscv/sbrdsp_rvv.S

@@ -48,3 +48,22 @@ func ff_sbr_sum64x5_rvv, zve32f
 
         ret
 endfunc
+
+func ff_sbr_sum_square_rvv, zve32f
+        vsetvli t0, zero, e32, m8, ta, ma
+        slli    a1, a1, 1
+        vmv.v.x v8, zero
+        vmv.s.x v0, zero
+1:
+        vsetvli t0, a1, e32, m8, tu, ma
+        vle32.v v16, (a0)
+        sub     a1, a1, t0
+        vfmacc.vv v8, v16, v16
+        sh2add  a0, t0, a0
+        bnez    a1, 1b
+
+        vfredusum.vs v0, v8, v0
+        vfmv.f.s fa0, v0
+NOHWF   fmv.x.w  a0, fa0
+        ret
+endfunc