feat(L04): add RV32I decoder and register file card

tests/test_rtl.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -euo pipefail
+root="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)"
+mode=test
+if [[ "${1:-}" == "--build-only" || "${1:-}" == "--trace" ]]; then mode="${1#--}"; shift; fi
+task="${1:?task name is required}"
+case "$task" in task01_instruction_fields|task02_opcode_decoder|task03_register_file) ;; *) printf 'Unknown RTL task: %s\n' "$task" >&2; exit 2 ;; esac
+state="${STEM_STATE_DIR:-$root/.stem/instances/local}"
+profile="${STEM_PROFILE:-hazard3-sim}"
+target="${STEM_TARGET:-hazard3-baremetal}"
+build_dir="$state/build/rtl/$task"
+artifact_dir="$root/.stem/artifacts/$profile/$target/$task"
+binary="$build_dir/sim"
+mkdir -p "$build_dir" "$artifact_dir"
+verilator --binary --timing --assert --trace -Wall -Wno-fatal -Wno-DECLFILENAME -Wno-BLKSEQ -Wno-UNUSEDSIGNAL \
+  --top-module tb --Mdir "$build_dir/obj" -o "$binary" \
+  "$root/src/tasks/$task.sv" "$root/tests/${task}_tb.sv" >/dev/null
+cp -f "$root/src/tasks/$task.sv" "$artifact_dir/"
+[[ "$mode" == build-only ]] && { printf 'BUILD %s binary=%s\n' "$task" "$binary"; exit 0; }
+trace_file="$artifact_dir/$task.vcd"
+if [[ "$mode" == trace ]]; then "$binary" "+trace=$trace_file"; test -s "$trace_file"; printf 'TRACE %s vcd=%s\n' "$task" "$trace_file"; else "$binary"; fi