neon

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tips needed: aac encode on android using ffmpeg-neon optimization

there I am trying to do some performance improvement about libfaac/libx264 encoder using ffmpeg and neon.seems successfully开发者_Python百科 compiled ffmpeg with neon support,and video encode performa[详细]

2023-04-12 11:41 分类：问答
"Immediate out of range errors" when assigning 0.0 to a NEON register

If I understand it correctly, because ARM instructions are 32 bits long they can only hold so many bits of immediate value. What I\'m trying to do is vmov.f32 s0, #0.0, and I get \"immediate out of ra[详细]

2023-04-12 01:07 分类：问答
Optimizing RGBA8888 to RGB565 conversion with NEON

I\'m trying to optimize an image format conversion on iOS using the NEON vector instruction set. I assumed this would map well to that because it processes a bunch of similar data.[详细]

2023-04-11 16:28 分类：问答
Problems with Qualcomm Scorpion dual-core ARM NEON code?

I am developing a native library for Android where I use ARM assembly optimizations and multithreading in order to get maximum performance on the dual-core ARM chipset MSM8660. While doing some measur[详细]

2023-04-09 02:06 分类：问答
Cortex A9 NEON vs VFP usage confusion

I\'m trying to build a library for a Cortex A9 ARM processor(an OMAP4 to be more specific) and I\'m in a little bit of confusion regarding which\\when to use NEON vs VFP in the context of floating poi[详细]

2023-04-01 15:52 分类：问答
NEON vs Intel SSE - equivalence of certain operations

I\'m having some trouble figuring out the NEON equivalence of a couple of Intel SSE operations. It seems that NEON is not capable to handle an entire Q register at once(128 bit value data type). I hav[详细]

2023-03-31 12:36 分类：问答
Aliasing of NEON vector data types

Does NEON support aliasing of the vector data types with their scalar components? E.g.(开发者_如何转开发Intel SSE)[详细]

2023-03-30 19:32 分类：问答
Typecasting a JNI Java array to NEON

I\'m sure people do this all the time, but I\'m having a hard time here. I\'m passing an array of floats to a JNI function, but t开发者_如何学JAVAhen I\'m intended to use NEON SIMD capabilities of ARM[详细]

2023-03-26 19:18 分类：问答
Sum all elements in a quadword vector in ARM assembly with NEON

Im rather new to assembly and although the arm information center is often helpful sometimes the instructions can be a little confusing to a newbie. Basically what I need to do is sum 4 float values i[详细]

2023-03-25 20:41 分类：问答
comparison with floats in neon intrinsics

I think this a silly problem but i tried for a day to resolve this with not luck, so here is. i have register of four vectors (float32x4), and i want to make some process on some of them and the othe[详细]

2023-03-22 11:55 分类：问答