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lavc/rv34dsp: use saturating add/sub for R-V V DC add

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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)
This commit is contained in:
Rémi Denis-Courmont 2024-07-28 21:40:52 +03:00
parent 952b426f3b
commit 54ae270213
1 changed files with 11 additions and 8 deletions
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19
libavcodec/riscv/rv34dsp_rvv.S
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@ -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