8000 双线性插值汇编代码疑问 · Issue #4531 · Tencent/ncnn · GitHub
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双线性插值汇编代码疑问 #4531

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fubuzhuirou1 opened this issue Feb 16, 2023 · 2 comments
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双线性插值汇编代码疑问 #4531

fubuzhuirou1 opened this issue Feb 16, 2023 · 2 comments

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@fubuzhuirou1
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detail | 详细描述 | 詳細な説明

mat_pixel_resize.cpp

三次右移
797行int16x4_t _rows0_sr4 = vshrn_n_s32(_rows0, 4);
888行"vsra.s32   q10, q0, #16    \n"
896行"vshrn.s32  d20, q10, #2    \n"

数字2
874行"mov        r4, #2          \n"

上述几行代码意思没太理解，能帮忙分析下吗？
@fubuzhuirou1
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@nihui 你好，打扰一下，可以帮忙看下这个疑问吗，非常感谢。

@nihui
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nihui commented Dec 5, 2023

重写了下 #5200
文档参考 https://developer.arm.com/architectures/instruction-sets/intrinsics

@nihui nihui closed this as completed Dec 5, 2023
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