Stowage/ffmpeg
2
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2026-06-04 14:40:26 +00:00
Code Issues Projects Releases Packages Wiki Activity

lavu/aarch64: unroll butterflies_float to 8 floats/iter

Browse source 
butterflies_float_neon:   before           after
  Cortex-A76 (gcc 12.4):  163.1 (3.95x)    147.0 (4.37x)
  Apple M1 (clang 16):      0.7 (0.85x)      0.6 (0.99x)

Signed-off-by: Zhao Zhili <quinkblack@foxmail.com>
This commit is contained in:
Zhao Zhili 2026-05-21 15:01:50 +08:00 • committed by Zhao Zhili
parent 1f66f9041b
commit 1e86a92a1c
1 changed files with 17 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

23
libavutil/aarch64/float_dsp_neon.S
View file

@ -178,15 +178,26 @@ function ff_vector_fmul_reverse_neon, export=1
endfunc
function ff_butterflies_float_neon, export=1
1: ld1 {v0.4s}, [x0]
subs w2, w2, #8
b.lt 2f
1: ldp q0, q1, [x0]
ldp q2, q3, [x1]
subs w2, w2, #8
fadd v4.4s, v0.4s, v2.4s
fadd v5.4s, v1.4s, v3.4s
fsub v0.4s, v0.4s, v2.4s
fsub v1.4s, v1.4s, v3.4s
st1 {v4.4s, v5.4s}, [x0], #32
st1 {v0.4s, v1.4s}, [x1], #32
b.ge 1b
2: tbz w2, #2, 3f
ld1 {v0.4s}, [x0]
ld1 {v1.4s}, [x1]
subs w2, w2, #4
fsub v2.4s, v0.4s, v1.4s
fadd v3.4s, v0.4s, v1.4s
st1 {v2.4s}, [x1], #16
st1 {v3.4s}, [x0], #16
b.gt 1b
ret
st1 {v2.4s}, [x1]
st1 {v3.4s}, [x0]
3: ret
endfunc
function ff_scalarproduct_float_neon, export=1