im2col module in Gemmini

[jack4041313]

https://people.eecs.berkeley.edu/~ysshao/assets/papers/genc2021-dac.pdf

In this paper, I observed that Gemmini includes the im2col module. The Rocket core consumes too many clock cycles on im2col. I need a more efficient way to execute im2col. Does the current Gemmini support the im2col function?

[hngenc]

The im2col module was basically replaced by the LoopConv.scala module, which is used by default by tiled_conv_auto. It should be used by default by resnet50.c and mobilenet.c, if you want to see examples