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| author | Rémi Denis-Courmont <remi@remlab.net> | 2024-07-28 21:40:52 +0300 |
|---|---|---|
| committer | Rémi Denis-Courmont <remi@remlab.net> | 2024-08-01 18:43:04 +0300 |
| commit | 54ae270213b5a98f923bfd4506e450b2e764ede2 (patch) | |
| tree | a45efa58ced295e4a53f37839259ff9f4e1adda9 /libavcodec/riscv | |
| parent | 952b426f3bcc6206eff2fa338ff7da475a28692b (diff) | |
| download | ffmpeg-54ae270213b5a98f923bfd4506e450b2e764ede2.tar.gz | |
lavc/rv34dsp: use saturating add/sub for R-V V DC add
T-Head C908 (cycles):
rv34_idct_dc_add_c: 113.2
rv34_idct_dc_add_rvv_i32: 48.5 (before)
rv34_idct_dc_add_rvv_i32: 39.5 (after)
Diffstat (limited to 'libavcodec/riscv')
| -rw-r--r-- | libavcodec/riscv/rv34dsp_rvv.S | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/libavcodec/riscv/rv34dsp_rvv.S b/libavcodec/riscv/rv34dsp_rvv.S index 478bc0a860..fc0ffec4fe 100644 --- a/libavcodec/riscv/rv34dsp_rvv.S +++ b/libavcodec/riscv/rv34dsp_rvv.S @@ -41,14 +41,17 @@ func ff_rv34_idct_dc_add_rvv, zve32x mul t1, t1, a2 addi t1, t1, 512 srai t1, t1, 10 - vsetivli zero, 4*4, e16, m2, ta, ma - vzext.vf2 v2, v0 - vadd.vx v2, v2, t1 - vmax.vx v2, v2, zero - vsetvli zero, zero, e8, m1, ta, ma - vnclipu.wi v0, v2, 0 - vsetivli zero, 4, e8, mf4, ta, ma - vsse32.v v0, (a0), a1 + vsetivli zero, 4*4, e8, m2, ta, ma + bgez t1, 1f + neg t1, t1 + vssubu.vx v0, v0, t1 + vsetivli zero, 4, e8, mf4, ta, ma + vsse32.v v0, (a0), a1 + ret +1: + vsaddu.vx v0, v0, t1 + vsetivli zero, 4, e8, mf4, ta, ma + vsse32.v v0, (a0), a1 ret endfunc |