From d1adf3c2c2f21d71c0ed9ae50253876d383fbb19 Mon Sep 17 00:00:00 2001
From: Summer-the-coder <galaxycraftgames90@gmail.com>
Date: Wed, 1 Oct 2025 16:56:08 +0300
Subject: [PATCH] Update pi.c: performance improvement

---
 .../performance/numerical/src/nativeInterop/cinterop/pi.c   | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kotlin-native/performance/numerical/src/nativeInterop/cinterop/pi.c b/kotlin-native/performance/numerical/src/nativeInterop/cinterop/pi.c
index d22f3994ecd2a..c7babaca83ee3 100644
--- a/kotlin-native/performance/numerical/src/nativeInterop/cinterop/pi.c
+++ b/kotlin-native/performance/numerical/src/nativeInterop/cinterop/pi.c
@@ -74,12 +74,12 @@ static int pow_mod(int a, int b, int m)
 static int is_prime(int n)
 {
     int r, i;
-    if ((n % 2) == 0)
+    if ((n % 2) == 0 || (n % 3) == 0)
         return 0;
 
     r = (int) (sqrt(n));
-    for (i = 3; i <= r; i += 2)
-        if ((n % i) == 0)
+    for (i = 5; i <= r; i += 6)
+        if ((n % i) == 0 || (n % (i + 2)) == 0)
             return 0;
     return 1;
 }