Make tearing only allocate O(N) memory and fix count_nonzeros perf problem
#1889
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Before: ```julia julia> @time sysRed, = structural_simplify(sysEx, (inputs=(), outputs=())); 10.891029 seconds (31.88 M allocations: 7.849 GiB, 18.15% gc time) ``` After: ``` julia> @time sysRed, = structural_simplify(sysEx, (inputs=(), outputs=())); 7.814676 seconds (31.85 M allocations: 4.889 GiB, 13.28% gc time) ```
```julia julia> @time sysRed, = structural_simplify(sysEx, (inputs=(), outputs=())); 5.951818 seconds (31.59 M allocations: 2.248 GiB, 10.44% gc time) ```
YingboMa
changed the title
count_nonzeros perf problem
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