RVV1.0 Requantize Layer

[Deepdive543443]

Road to int8 optimization Episode 3: Requantize Layer

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✅ Deepdive543443
❌ nihui
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[nihui]

@codex review

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.46%. Comparing base (9ee760d) to head (3614864).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6695      +/-   ##
==========================================
- Coverage   95.85%   95.46%   -0.39%     
==========================================
  Files         934      935       +1     
  Lines      312692   312277     -415     
==========================================
- Hits       299720   298122    -1598     
- Misses      12972    14155    +1183     

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[Copilot]

Pull request overview

Adds a RISC-V (RVV 1.0) implementation of the Requantize layer (third installment in the int8 optimization series), along with helper SIMD routines and updated tests for the new backend.

Changes:

• Adds Requantize_riscv (header + cpp) implementing vectorized requantize + bias + activation + int8 conversion using RVV intrinsics, plus a scalar fallback.
• Adds RVV helpers float2int8relu and float2int8leakyrelu (m4/m8 variants) to riscv_usability.h.
• In tests/test_requantize.cpp, adds a new test_requantize helper (no forced pack8) and routes test_requantize_3 through it on __riscv builds instead of test_requantize_pack8.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/layer/riscv/requantize_riscv.h	Declares Requantize_riscv derived from base Requantize.
src/layer/riscv/requantize_riscv.cpp	Vectorized requantize implementation with separate ReLU/LeakyReLU fast path and generic activation path; dim 1/2/3 forward.
src/layer/riscv/riscv_usability.h	New float2int8relu and float2int8leakyrelu RVV helpers used by the new layer.
tests/test_requantize.cpp	Adds a non-pack-forcing helper used in test_requantize_3 for __riscv to replace the pack8 cases.

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[nihui]

Thanks for your contribution !