Make the implementation of optimization in DNN adjustable to different vector sizes with RVV intrinsics.#20521
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👍 Tested with QEMU and vlen=128,256
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Make the implementation of optimization in DNN adjustable to different vector sizes with RVV intrinsics. * Update fastGEMM for multi VLEN. * Update fastGEMM1T for multi VLEN. * Update fastDepthwiseConv for multi VLEN. * Update fastConv for multi VLEN. * Replace malloc with cv::AutoBuffer.
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PR for GSoC'21 project on Optimize OpenCV DNN for RISC-V. Related PR #20287.
This PR will further optimize DNN on the basis of #20287, especially when VLEN>128.
In #20287, we have used RVV Intrinsic to optimize the 4 kernel functions in DNN. However, if RVV vectors are 256-bit wide or more longer, then the current implementation will use only a part of them. This PR tries to adjustable to different vector sizes.
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Patch to opencv_extra has the same branch name.