emulator,Makefile-verilator: add --output-split-cfuncs flag
* Originally verilator will generate a large cpp file containing a large function, which costs about 13 min to compile. By using --output-split-cfuncs, this large function will be splitted into several functions in servral files. This will greatly improve the compile time with 'make -j'. By '-j32', the compile time can be reduced to about 1 min.
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@ -55,6 +55,7 @@ VERILATOR_FLAGS := --top-module $(MODEL) \
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+define+PRINTF_COND=\$$c\(\"verbose\",\"\&\&\"\,\"done_reset\"\) \
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+define+STOP_COND=\$$c\(\"done_reset\"\) --assert \
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--output-split 20000 \
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--output-split-cfuncs 20000 \
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-Wno-STMTDLY --x-assign unique \
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-I$(base_dir)/vsrc \
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-O3 -CFLAGS "$(CXXFLAGS) -DVERILATOR -DTEST_HARNESS=V$(MODEL) -include $(base_dir)/csrc/verilator.h"
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