feat: complete safe RV32 constant-load merge optimization

.github/workflows/ci.yml

@@ -11,18 +11,29 @@ env:
 
 permissions:
   contents: read
-  pages: write
-  id-token: write
 
 jobs:
   # ═════════════════════════════════════════════════════════════════════════
   # 课题功能测试：所有14个模块的单元测试 + 集成测试
   # ═════════════════════════════════════════════════════════════════════════
   test:
-    runs-on: self-hosted
+    runs-on: ${{ github.event_name == 'pull_request' && 'ubuntu-latest' || 'self-hosted' }}
     timeout-minutes: 20
     steps:
+      - name: Checkout pull request on isolated runner
+        if: github.event_name == 'pull_request'
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
+        with:
+          persist-credentials: false
+
+      - name: Set up Python for pull request
+        if: github.event_name == 'pull_request'
+        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
+        with:
+          python-version: "3.12"
+
       - name: Sync from local mirror (skip unstable GitHub checkout)
+        if: github.event_name != 'pull_request'
         run: |
           echo "=== CI Sync ==="
           retry() {
@@ -46,12 +57,6 @@ jobs:
           cd "$WORKSPACE"
           echo "Fetching origin main..."
           retry "git fetch origin main" git fetch origin main || exit 1
-          if [ "$GITHUB_EVENT_NAME" = "pull_request" ]; then
-            PR_NUMBER="${GITHUB_REF#refs/pull/}"
-            PR_NUMBER="${PR_NUMBER%/merge}"
-            echo "Fetching PR #${PR_NUMBER} merge ref..."
-            retry "git fetch PR #${PR_NUMBER}" git fetch origin "refs/pull/${PR_NUMBER}/merge" || exit 1
-          fi
           echo "Checking out $GITHUB_SHA..."
           if git -c advice.detachedHead=false checkout -f "$GITHUB_SHA"; then
             echo "::notice::Checkout successful: $(git log -1 --format='%h %ai %s')"
@@ -64,6 +69,7 @@ jobs:
         run: |
           python3.12 -m pip install --upgrade pip
           python3.12 -m pip install -e ".[all]"
+          python3.12 -m pip install "pytest>=7,<10"
 
       - name: Run all topic tests
         run: |
@@ -72,6 +78,14 @@ jobs:
             --junit-xml=benchmark_reports/test_results.xml \
             --ignore=tests/test_simulator.py
 
+      - name: Run constant-merge regressions
+        run: |
+          python3.12 -m pytest \
+            tests/test_const_merge.py \
+            tests/test_backend.py::TestConstMergeIntegration \
+            tests/test_simulator.py::TestStubProfiledMachine \
+            -v --tb=short
+
       - name: Run PR #37 register-allocation regressions
         run: python3.12 -m pytest tests/test_pr37_regression.py -v --tb=short
 
@@ -84,7 +98,7 @@ jobs:
 
       - name: Upload test reports
         if: github.ref == 'refs/heads/main'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: test-reports
           path: |
@@ -96,10 +110,23 @@ jobs:
   # 模型性能测试：ONNX模型管线 + DSL用例 + CNN RISC-V编译
   # ═════════════════════════════════════════════════════════════════════════
   benchmark:
-    runs-on: self-hosted
+    runs-on: ${{ github.event_name == 'pull_request' && 'ubuntu-latest' || 'self-hosted' }}
     timeout-minutes: 30
     steps:
+      - name: Checkout pull request on isolated runner
+        if: github.event_name == 'pull_request'
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
+        with:
+          persist-credentials: false
+
+      - name: Set up Python for pull request
+        if: github.event_name == 'pull_request'
+        uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
+        with:
+          python-version: "3.12"
+
       - name: Sync from local mirror (skip unstable GitHub checkout)
+        if: github.event_name != 'pull_request'
         run: |
           echo "=== CI Sync ==="
           retry() {
@@ -123,12 +150,6 @@ jobs:
           cd "$WORKSPACE"
           echo "Fetching origin main..."
           retry "git fetch origin main" git fetch origin main || exit 1
-          if [ "$GITHUB_EVENT_NAME" = "pull_request" ]; then
-            PR_NUMBER="${GITHUB_REF#refs/pull/}"
-            PR_NUMBER="${PR_NUMBER%/merge}"
-            echo "Fetching PR #${PR_NUMBER} merge ref..."
-            retry "git fetch PR #${PR_NUMBER}" git fetch origin "refs/pull/${PR_NUMBER}/merge" || exit 1
-          fi
           echo "Checking out $GITHUB_SHA..."
           if git -c advice.detachedHead=false checkout -f "$GITHUB_SHA"; then
             echo "::notice::Checkout successful: $(git log -1 --format='%h %ai %s')"
@@ -141,12 +162,20 @@ jobs:
         run: |
           python3.12 -m pip install --upgrade pip
           python3.12 -m pip install -e ".[all]"
-          python3.12 -m pip install markdown
+          python3.12 -m pip install markdown "pytest>=7,<10"
 
       # ── 3.1 ONNX 模型管线基准测试 ──────────────────────────────────────
       - name: ONNX model pipeline benchmarks
         run: python3.12 -m pytest benchmarks/test_benchmark.py -v --tb=short
 
+      # ── 3.1.1 课题14：固定 case + 真实 TinyFive A/B 报告 ─────────────
+      - name: Topic 14 constant-merge case report
+        run: |
+          python3.12 benchmarks/run_const_merge_case.py \
+            benchmarks/cases/const_merge_feature.asm \
+            --json benchmark_reports/const_merge_report.json \
+            --markdown benchmark_reports/const_merge_report.md
+
       # ── 3.2 DSL 用例编译 + 模拟基准 ────────────────────────────────────
       - name: DSL case compilation benchmarks
         run: |
@@ -166,7 +195,7 @@ jobs:
             python3.12 scripts/gen_minimal_cnn.py 2>&1
           fi
           python3.12 scratchv/standalone/onnx_to_riscv_standalone.py \
-            "$MODEL" -o /tmp/cnn_riscv.bin --estimate --report
+            "$MODEL" -o /tmp/cnn_riscv.bin --estimate --report --const-merge
 
       # ── 3.4 LLVM vs ScratchV + TinyFive + Dashboard ──────────────────
       - name: LLVM vs ScratchV comparison
@@ -176,7 +205,8 @@ jobs:
           if [ ! -f benchmark_reports/cnn_scratchv.s ] && [ -f models/graph/cnn.onnx ]; then
             python3.12 scratchv/standalone/onnx_to_riscv_standalone.py \
               models/graph/cnn.onnx -o /tmp/cnn_riscv.bin \
-              --asm benchmark_reports/cnn_scratchv.s --estimate 2>&1 | tail -3
+              --asm benchmark_reports/cnn_scratchv.s --estimate \
+              --const-merge 2>&1 | tail -3
           fi
           python3.12 scratchv/standalone/llvm_cache_compare.py \
             --json-output benchmark_reports/llvm_vs_scratchv.json \
@@ -211,7 +241,8 @@ jobs:
 
       # ── 上报 ──────────────────────────────────────────────────────────
       - name: Upload benchmark reports
-        uses: actions/upload-artifact@v4
+        if: always()
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: benchmark-reports
           path: benchmark_reports/
@@ -256,12 +287,17 @@ jobs:
       # ── 上传 Pages 产物 ──────────────────────────────────────────────
       - name: Upload Pages artifact
         if: github.ref == 'refs/heads/main'
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa # v3
         with:
           path: benchmark_reports/
 
       - name: Write job summary
+        if: always()
         run: |
+          if [ -f benchmark_reports/const_merge_report.md ]; then
+            cat benchmark_reports/const_merge_report.md >> $GITHUB_STEP_SUMMARY
+          fi
+          echo "" >> $GITHUB_STEP_SUMMARY
           if [ -f benchmark_reports/github_summary.md ]; then
             cat benchmark_reports/github_summary.md >> $GITHUB_STEP_SUMMARY
           fi
@@ -287,4 +323,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e # v4