The source code for conv2d

Hi, I wanna to do some work about the conv2d, but the release did not make the source code of con2d available. What should I do to approach the conv2d?

Are you referring to these file link1 link2

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Thank you. I originally want to refer the C source codes, but it is too complicated. I finally complete my work with refering link1 and link2, thank you for your help.