fine tune ci to build more with circleci (#3386)

* fine tune ci to build more with circleci
* skip make for arm-iar, esp-idf
* skip make + clang for circleci since llvm-objcopy got killed due to memory issue.

1 files changed, 8 insertions, 11 deletions

diff --git a/tools/metrics.py b/tools/metrics.py
index bb84f803e..c3b366e42 100644
--- a/tools/metrics.py
+++ b/tools/metrics.py
@@ -195,17 +195,13 @@ def compare_maps(base_file, new_file, filters=None):
 
 def format_diff(base, new, diff):
     """Format a diff value with percentage."""
-    if base == 0 and new == 0:
-        return "0"
-    if base == 0:
-        return f"{new} (new)"
-    if new == 0:
-        return f"{base} ➡ 0"
     if diff == 0:
-        return f"{base} ➡ {new}"
+        return f"{new}"
+    if base == 0 or new == 0:
+        return f"{base} ➙ {new}"
     pct = (diff / base) * 100
     sign = "+" if diff > 0 else ""
-    return f"{base} ➡ {new} ({sign}{diff}, {sign}{pct:.1f}%)"
+    return f"{base} ➙ {new} ({sign}{diff}, {sign}{pct:.1f}%)"
 
 
 def get_sort_key(sort_order):
@@ -232,10 +228,11 @@ def write_compare_markdown(comparison, path, sort_order='size'):
     sections = comparison["sections"]
 
     md_lines = [
-        "# TinyUSB Code Size Different Report",
+        "# Size Difference Report",
         "",
-        f"**Base:** `{comparison['base_file']}`",
-        f"**New:** `{comparison['new_file']}`",
+        "Because TinyUSB code size varies by port and configuration, the metrics below represent the averaged totals across all example builds."
+        "",
+        "Note: If there is no change, only one value is shown.",
         "",
     ]