From 8502a549ef506164ba506cecb5e1003bf53a4f27 Mon Sep 17 00:00:00 2001
From: Maxime Chevalier-Boisvert <maxime.chevalierboisvert@shopify.com>
Date: Fri, 6 Dec 2024 12:25:39 -0500
Subject: [PATCH] YJIT: small fix to stats formatting. (#12282)

Avoid division by zero and NaN%, e.g.
num_throw_break:                   0 ( NaN%)
num_throw_retry:                   0 ( NaN%)
num_throw_return:                  0 ( NaN%)
---
 yjit.rb | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/yjit.rb b/yjit.rb
index fa8f05096d..8eb7ef677c 100644
--- a/yjit.rb
+++ b/yjit.rb
@@ -521,9 +521,14 @@ module RubyVM::YJIT
     # Format a number along with a percentage over a total value
     def format_number_pct(pad, number, total) # :nodoc:
       padded_count = format_number(pad, number)
-      percentage = number.fdiv(total) * 100
-      formatted_pct = "%4.1f%%" % percentage
-      "#{padded_count} (#{formatted_pct})"
+
+      if total != 0
+        percentage = number.fdiv(total) * 100
+        formatted_pct = "%4.1f%%" % percentage
+        "#{padded_count} (#{formatted_pct})"
+      else
+        "#{padded_count}"
+      end
     end
 
     # :startdoc: