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| author | Rémi Denis-Courmont <remi@remlab.net> | 2023-07-17 20:46:06 +0300 |
|---|---|---|
| committer | Rémi Denis-Courmont <remi@remlab.net> | 2023-07-20 22:54:34 +0300 |
| commit | 44cac1def0fab47592882afe6695e39c20781839 (patch) | |
| tree | 6d99c78d3663f20940d5ddaa891eeaedac1419cd | |
| parent | 29b9d616c212f20bc0d3e24928919a14efc047f8 (diff) | |
| download | ffmpeg-44cac1def0fab47592882afe6695e39c20781839.tar.gz | |
lavc/audiodsp: rework RISC-V V scalar product
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
| -rw-r--r-- | libavcodec/riscv/audiodsp_rvv.S | 15 |
1 files 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 |