Add -O5 option to QuestaSim. Rerun benchmarks.

test-modelsim-O5/.dir-locals.el

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+((verilog-mode . ((flycheck-verilator-include-path . ("../source")))))

test-modelsim-O5/.gitignore

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+testbench
+transcript

test-modelsim-O5/__build.sh

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+#!/usr/bin/env bash
+set -e
+
+. ../scripts/sim_vars.sh
+
+rm -rf testbench
+vlog -sv -work testbench -vopt $param -f $FFILE top.sv

test-modelsim-O5/__run.sh

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+#!/usr/bin/env bash
+
+. ../scripts/sim_vars.sh
+
+vsim -batch -voptargs=-O5 -do "run -all" -quiet +dlen=$BLOCK_SIZE -GCPU_COUNT=$CPU_COUNT -lib testbench top

test-modelsim-O5/top.sv

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+`timescale 1ps/1ps
+
+module top #(parameter CPU_COUNT = 1024);
+    logic clock = 1'b0;
+    initial forever #(10ns/2) clock = ~clock;
+    testbench #(CPU_COUNT) testbench (clock);
+endmodule