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| author | Rémi Denis-Courmont <remi@remlab.net> | 2024-07-25 17:40:26 +0300 |
|---|---|---|
| committer | Rémi Denis-Courmont <remi@remlab.net> | 2024-07-28 17:37:21 +0300 |
| commit | 9b4655c3a145d5d0f315c3bd0a80792f37603c2f (patch) | |
| tree | 8b2d0880ac04132618d2af1d0303e2f966eba67f | |
| parent | bbfc0ac9cacbfbddd94ffc92ef904b7854cb88ad (diff) | |
| download | ffmpeg-9b4655c3a145d5d0f315c3bd0a80792f37603c2f.tar.gz | |
lavc/vp8dsp: use saturating add/sub for R-V V DC add
T-Head C908 (cycles):
vp7_idct_dc_add_c: 108.5
vp7_idct_dc_add_rvv_i32: 56.2 (before)
vp7_idct_dc_add_rvv_i32: 47.2 (after)
vp8_idct_dc_add_c: 96.2
vp8_idct_dc_add_rvv_i32: 43.0 (before)
vp8_idct_dc_add_rvv_i32: 34.0 (after)
| -rw-r--r-- | libavcodec/riscv/vp8dsp_rvv.S | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/libavcodec/riscv/vp8dsp_rvv.S b/libavcodec/riscv/vp8dsp_rvv.S index 6ff443fbe6..a8b3e239ba 100644 --- a/libavcodec/riscv/vp8dsp_rvv.S +++ b/libavcodec/riscv/vp8dsp_rvv.S @@ -172,12 +172,18 @@ func ff_vp78_idct_dc_add_rvv, zve32x vsetivli zero, 4, e8, mf4, ta, ma sh zero, (a1) vlse32.v v8, (a0), a2 - vsetivli zero, 16, e16, m2, ta, ma - vzext.vf2 v16, v8 - vadd.vx v16, v16, a3 - vmax.vx v16, v16, zero - vsetvli zero, zero, e8, m1, ta, ma - vnclipu.wi v8, v16, 0 + vsetivli zero, 16, e8, m1, ta, ma + bgez a3, 1f + + # block[0] < 0 + neg a3, a3 + vssubu.vx v8, v8, a3 + vsetivli zero, 4, e8, mf4, ta, ma + vsse32.v v8, (a0), a2 + ret + +1: # block[0] >= 0 + vsaddu.vx v8, v8, a3 vsetivli zero, 4, e8, mf4, ta, ma vsse32.v v8, (a0), a2 ret |