x86 concat slice flatten reshape crop padding packing support fp16 bf16 storage

[nihui]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 99.31996% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.54%. Comparing base (0137512) to head (05eab95).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/layer/x86/padding_x86.cpp	94.44%	14 Missing ⚠️
src/layer/x86/packing_x86.cpp	99.30%	5 Missing ⚠️
src/layer/x86/reshape_x86.cpp	99.64%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6593      +/-   ##
==========================================
- Coverage   92.82%   92.54%   -0.28%     
==========================================
  Files         849      736     -113     
  Lines      268474   251883   -16591     
==========================================
- Hits       249200   233111   -16089     
+ Misses      19274    18772     -502     

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[Copilot]

Pull request overview

This PR adds fp16 (half-precision float) and bf16 (bfloat16) storage support to several x86 layer implementations: concat, slice, flatten, reshape, crop, padding, and packing. These are data-movement layers that don't perform arithmetic computation, so they only need to handle memory copying and repacking of 16-bit data elements.

Changes:

• Add forward_bf16s_fp16s methods to concat, slice, flatten, reshape, padding, and packing x86 layers, using unsigned short as the underlying data type for 16-bit storage
• Add new bf16s/fp16s-specific padding helper headers (padding_pack4_bf16s_fp16s.h, padding_pack8_bf16s_fp16s.h, padding_pack16_bf16s_fp16s.h) and crop helper functions using appropriately-sized SIMD or integer operations
• Enable support_fp16_storage (via cpu_support_x86_f16c()) and support_bf16_storage in constructors of all affected layers, with dispatch based on elembits() == 16

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/layer/x86/concat_x86.h	Add forward_bf16s_fp16s declaration
src/layer/x86/concat_x86.cpp	Add bf16/fp16 concat implementation with element repacking for all dims/axes
src/layer/x86/slice_x86.h	Add forward_bf16s_fp16s declaration
src/layer/x86/slice_x86.cpp	Add bf16/fp16 slice implementation with element repacking for all dims/axes
src/layer/x86/flatten_x86.h	Add forward_bf16s_fp16s declaration
src/layer/x86/flatten_x86.cpp	Add bf16/fp16 flatten implementation with deinterleaving
src/layer/x86/reshape_x86.h	Add forward_bf16s_fp16s declaration
src/layer/x86/reshape_x86.cpp	Add bf16/fp16 reshape implementation with flatten + repack
src/layer/x86/padding_x86.h	Add forward_bf16s_fp16s, create_pipeline/destroy_pipeline, and bf16/fp16 member fields
src/layer/x86/padding_x86.cpp	Add bf16/fp16 padding with pipeline for value/per-channel conversion
src/layer/x86/padding_pack4_bf16s_fp16s.h	New: pack4 constant/replicate/reflect padding for bf16/fp16
src/layer/x86/padding_pack8_bf16s_fp16s.h	New: pack8 constant/replicate/reflect padding for bf16/fp16
src/layer/x86/padding_pack16_bf16s_fp16s.h	New: pack16 constant/replicate/reflect padding for bf16/fp16
src/layer/x86/packing_x86.h	Add forward_bf16s_fp16s declaration
src/layer/x86/packing_x86.cpp	Add bf16/fp16 packing for all elempack combinations (1↔4↔8↔16)
src/layer/x86/crop_x86.h	Copyright update
src/layer/x86/crop_x86.cpp	Add bf16/fp16 crop helpers and dispatch by elemsize within existing forward methods

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