neon

I want to optimize histogram statistic code with neon intrinsics.But I didn't succeed.Here is the c code: #define NUM (7*1024*1024) uint8 src_data[NUM]; uint32 histogram_result[256] = {0}; for (int i = 0; i < NUM; i++) { histogram_result[src_data[i]]++; } Historam statistic is more like serial processing.It's difficult to optimize with neon intrinsics.Does anyone know how to optimize?Thanks in advance. You can't vectorise the stores directly, but you can pipeline them, and you can vectorise the address calculation on 32-bit platforms (and to a lesser extent on 64-bit platforms). The first

I need to write optimized NEON code for a project and I'm perfectly happy to write assembly language, but for portability/maintainability I'm using NEON instrinsics. This code needs to be as fast as possible, so I'm using my experience in ARM optimization to properly interleave instructions and avoid pipe stalls. No matter what I do, GCC works against me and creates slower code full of stalls. Does anyone know how to have GCC get out of the way and just translate my intrinsics into code? Here's an example: I have a simple loop which negates and copies floating point values. It works with 4

The ARM reference manual doesn't go into too much detail into the individual instructions ( http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0348b/BABIIBBG.html ). Is there something that's a little more detailed? For more information on the instructions themselves, you need the Assembler Guide . The list you found there just shows the mapping from compiler intrinsics to assembly instructions. There's also the ARM C Language Extensions which provides details on the usage of the intrinsics (see chapter 12) that could be useful. There is now an HTML version of the NEON Intrinsics

This code(very similar code, haven't tried exactly this code) compiles using Android NDK, but not with Xcode/armv7+arm64/iOS Errors in comments: uint32_t *src; uint32_t *dst; #ifdef __ARM_NEON __asm__ volatile( "vld1.32 {d0, d1}, [%[src]] \n" // error: Vector register expected "vrev32.8 q0, q0 \n" // error: Unrecognized instruction mnemonic "vst1.32 {d0, d1}, [%[dst]] \n" // error: Vector register expected : : [src]"r"(src), [dst]"r"(dst) : "d0", "d1" ); #endif What's wrong with this code? EDIT1: I rewrote the code using intrinsics: uint8x16_t x = vreinterpretq_u8_u32(vld1q_u32(src)); uint8x16

本文比较全面比较了目前主流的 Rust 的 GUI 框架的表现。其中 ++ 表示非常好，-- 表示非常差，而 o 表示处于平均水平。 参与对比的框架共有 8 个，详细的比较结果如下： Electron + Neon Electron + FFI Electron + NodeJS Cpp Addon Rust Program + Qt static Rust program + Qt dynamic Cpp program + Rust lib static + Qt static Cpp program + Rust lib static + Qt dynamic Gtk 易于构建 ++ ++ + -- + o + + 构建性能 ++ ++ ++ -- ++ -- ++ o 打包体积 - - - ++ + ++ + o 易于部署 ++ ++ ++ + o + o - Rust互操作性 + o - + + + + ++ 开发速度 ++ + - + -- + -- - 内存占用 o o o o o o o + CPU占用 - - - ++ ++ ++ ++ ++ 安全性 o o o + + + + + 外观 ++ ++ ++ + + + + o 响应式UI ++ ++ ++ o o o o - 框架稳定性 + + + -- -- -- -- - 平台支持 + + + ++ ++ ++