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Use PR target branch as synthesis diff baseline #234

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Use PR target branch as synthesis diff baseline #234

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Initial plan
Copilot May 23, 2026
b0e12c6
Use PR base branch context in synthesis diff messaging
Copilot May 23, 2026
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3 changes: 2 additions & 1 deletion .github/scripts/de1-soc-synthesis-metrics-diff/aggregate_metrics.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ set -euo pipefail

ARTIFACTS_DIR="${1:-metrics-diff}"
OUTPUT_FILE="${2:-comparison.md}"
BASE_BRANCH="${BASE_BRANCH:-base branch}"

append_metric_cell() {
local file="$1"
Expand Down Expand Up @@ -43,4 +44,4 @@ fi

echo "" >> "$OUTPUT_FILE"
echo "---" >> "$OUTPUT_FILE"
echo "*Comparing synthesis results from main branch vs. this PR*" >> "$OUTPUT_FILE"
echo "*Comparing synthesis results from \`$BASE_BRANCH\` branch vs. this PR*" >> "$OUTPUT_FILE"
17 changes: 9 additions & 8 deletions .github/scripts/de1-soc-synthesis-metrics-diff/compare_metrics_diff.sh
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@@ -1,27 +1,28 @@
#!/bin/bash
# Script to compare a synthesis report between main and PR branches
# Usage: compare_metrics_diff.sh <main_report_path> <pr_report_path>
# Example: compare_metrics_diff.sh "main-reports/report.summary" "pr-reports/report.summary"
# Script to compare a synthesis report between base and PR branches
# Usage: compare_metrics_diff.sh <base_report_path> <pr_report_path>
# Example: compare_metrics_diff.sh "base-reports/report.summary" "pr-reports/report.summary"

set -e

if [ $# -lt 2 ]; then
echo "Usage: $0 <main_report_path> <pr_report_path>" >&2
echo "Usage: $0 <base_report_path> <pr_report_path>" >&2
exit 1
fi

MAIN_REPORT="$1"
BASE_REPORT="$1"
PR_REPORT="$2"
BASE_BRANCH="${BASE_BRANCH:-base branch}"

if [ ! -f "$PR_REPORT" ]; then
echo "ERROR: PR report not found at $PR_REPORT" >&2
exit 1
fi

{
if [ -f "$MAIN_REPORT" ]; then
if [ -f "$BASE_REPORT" ]; then
# Generate diff and capture output
DIFF_OUTPUT=$(diff -u "$MAIN_REPORT" "$PR_REPORT" | tail -n +3 || true)
DIFF_OUTPUT=$(diff -u "$BASE_REPORT" "$PR_REPORT" | tail -n +3 || true)
if [ -z "$DIFF_OUTPUT" ]; then
echo "*No changes detected*"
else
Expand All @@ -30,7 +31,7 @@ fi
echo "\`\`\`"
fi
else
echo "*No baseline available from main branch*"
echo "*No baseline available from \`$BASE_BRANCH\` branch*"
echo ""
echo "<details>"
echo "<summary>View PR synthesis results</summary>"
Expand Down
4 changes: 4 additions & 0 deletions .github/workflows/ci.yaml
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Expand Up @@ -233,6 +233,8 @@ jobs:
runs-on: ubuntu-latest
permissions:
pull-requests: write
env:
BASE_BRANCH: ${{ github.base_ref }}

strategy:
matrix: *utoss-risc-v-matrix
Expand Down Expand Up @@ -300,6 +302,8 @@ jobs:
runs-on: ubuntu-latest
permissions:
pull-requests: write
env:
BASE_BRANCH: ${{ github.base_ref }}

steps:
- name: Checkout code
Expand Down