Modified the main loop to handle 8 floats in one go. A special case of
length not being multiple of 8 is handled at the beginning. The speed
increased from 3.90 to 4.50.
Krzysztof
---
libavutil/aarch64/float_dsp_neon.S | 30 ++++++++++++++++++++++--------
1 file changed, 22 insertions(+), 8 deletions(-)
diff --git a/libavutil/aarch64/float_dsp_neon.S
b/libavutil/aarch64/float_dsp_neon.S
index 35e2715b87..f99cc2e6b2 100644
--- a/libavutil/aarch64/float_dsp_neon.S
+++ b/libavutil/aarch64/float_dsp_neon.S
@@ -178,14 +178,28 @@ function ff_vector_fmul_reverse_neon, export=1
endfunc
function ff_butterflies_float_neon, export=1
-1: 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
+ tst w2, #4
+ b.eq bf8
+ ldr q0, [x0]
+ ldr q1, [x1]
+ fadd v2.4s, v0.4s, v1.4s
+ fsub v3.4s, v0.4s, v1.4s
+ str q2, [x0], #16
+ str q3, [x1], #16
+ sub w2, w2, #4
+ cbnz w2, bf8
+ ret
+bf8:
+ ldp q0, q1, [x0]
+ ldp q4, q5, [x1]
+ fadd v2.4s, v0.4s, v4.4s
+ fadd v3.4s, v1.4s, v5.4s
+ stp q2, q3, [x0], #32
+ fsub v2.4s, v0.4s, v4.4s
+ fsub v3.4s, v1.4s, v5.4s
+ stp q2, q3, [x1], #32
+ sub w2, w2, #8
+ cbnz w2, bf8
ret
endfunc
--
2.45.2
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