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License: MIT License
Arm neon optimization practice
License: MIT License
Hi Depeng
从你的知乎文章 移动端arm cpu优化学习笔记第4弹--内联汇编入门 看过来的。
我的NDK版本是r21b,代码不修改的情况下,内联汇编最后一部分有编译报错,原因是同一个变量,既作为 输入 也作为 输出。我找到的修改方法是,只在 output 部分传入,并且将=r
修改为+r
。
例如rgb转gray的:
:[src] "=r"(src),
[dst] "=r"(dst),
[neonLen] "=r"(neonLen)
:[src] "0"(src),
[dst] "1"(dst),
[neonLen] "2"(neonLen)
:"cc", "memory", "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "v9", "v10", "v11", "v12", "v13"
改为如下:
:[src] "+r"(src),
[dst] "+r"(dst),
[neonLen] "+r"(neonLen)
:
:"cc", "memory", "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "v9", "v10", "v11", "v12", "v13"
My run produces (left: input; middle: my implementation; right: this implementation; radius=10):
Can you try this input? It's a 201x201 FP32 square, stored with little-endian:
noisy-square.tar.gz
I use this routine to read the file:
template<typename T>
std::vector<T> read_raw(const std::string &path, bool little_endian = false)
{
std::ifstream file(path, std::ifstream::binary);
std::streamsize buffer_size = 1 << 20;
char buffer[buffer_size];
std::vector<T> raw;
while(!file.eof())
{
file.read(buffer, buffer_size);
for (int i = 0; i < std::min(buffer_size, file.gcount()); i += sizeof(T))
{
char *begin = &buffer[i];
if (little_endian)
std::reverse(begin, begin + sizeof(T));
raw.push_back(*(T *)begin);
}
}
file.close();
return raw;
}
Thank you.
求问为啥后面的neon指令看上去并没有加速很多?这里面的原因是为啥?
Radius 5
In 3.4Ghz Cpu
i use avx2 to improve add histogram and sub histogram
but the time speed greater than 200ms
image size 1280*1024
CMake Error at CMakeLists.txt:35 (add_subdirectory):
add_subdirectory given source "third_party/googletest/googletest" which is
not an existing directory.
请问大佬, 有办法对进行arm neon代码进行单步调试吗?或者开发的时候 如何去debug,arm neon汇编或者intrinsic
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