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3 commits

Author SHA1 Message Date
whitequark d5c07e5b6f cxxrtl: track aliases in VCD writer. 
This commit changes the VCD writer such that for all signals that
share `debug_item.curr`, it would only emit a single VCD identifier,
and sample the value once.

Commit 9b39c6f7 added redundancy to debug information by including
alias wires, and increased the size of VCD files proportionally; this
commit eliminates the redundancy from VCD files so that their size
is the same as before.
 2020-06-08 17:10:45 +00:00
whitequark 68362a9053 cxxrtl: only write VCD values that were actually updated. 
On a representative design (Minerva SoC) this reduces VCD file size
by ~20× and runtime by ~3×.
 2020-06-07 03:48:00 +00:00
whitequark 9c36102669 cxxrtl: add a VCD writer using debug information. 2020-06-07 03:48:00 +00:00