Take vector reduction out of the loop and unroll.
Before:
audiodsp.scalarproduct_int16_c: 12321.0
audiodsp.scalarproduct_int16_rvv_i32: 4175.7
After:
audiodsp.scalarproduct_int16_c: 12320.5
audiodsp.scalarproduct_int16_rvv_i32: 1230.2
---
libavcodec/riscv/audiodsp_rvv.S | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/libavcodec/riscv/audiodsp_rvv.S b/libavcodec/riscv/audiodsp_rvv.S
index af1e07bef9..f7eba2114f 100644
--- a/libavcodec/riscv/audiodsp_rvv.S
+++ b/libavcodec/riscv/audiodsp_rvv.S
@@ -21,21 +21,22 @@
#include "libavutil/riscv/asm.S"
func ff_scalarproduct_int16_rvv, zve32x
- vsetivli zero, 1, e32, m1, ta, ma
- vmv.s.x v8, zero
+ vsetvli t0, zero, e32, m8, ta, ma
+ vmv.v.x v8, zero
+ vmv.s.x v0, zero
1:
- vsetvli t0, a2, e16, m1, ta, ma
+ vsetvli t0, a2, e16, m4, tu, ma
vle16.v v16, (a0)
sub a2, a2, t0
vle16.v v24, (a1)
sh1add a0, t0, a0
- vwmul.vv v0, v16, v24
+ vwmacc.vv v8, v16, v24
sh1add a1, t0, a1
- vsetvli zero, t0, e32, m2, ta, ma
- vredsum.vs v8, v0, v8
bnez a2, 1b
- vmv.x.s a0, v8
+ vsetvli t0, zero, e32, m8, ta, ma
+ vredsum.vs v0, v8, v0
+ vmv.x.s a0, v0
ret
endfunc
--
2.40.1
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