From b5795dcd7669a1d45a3064a98c226e281c585d62 Mon Sep 17 00:00:00 2001
From: Hitalo Souza <enghitalo@gmail.com>
Date: Tue, 22 Oct 2024 10:02:47 -0400
Subject: [PATCH] builtin: improve performance of `string.starts_with/1` and
 `string.ends_with/1`, when compiled with tcc (#22620)

---
 vlib/builtin/string.v | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/vlib/builtin/string.v b/vlib/builtin/string.v
index 77e747f81498f5..da676cf976bed9 100644
--- a/vlib/builtin/string.v
+++ b/vlib/builtin/string.v
@@ -1499,13 +1499,10 @@ pub fn (s string) contains_any_substr(substrs []string) bool {
 pub fn (s string) starts_with(p string) bool {
 	if p.len > s.len {
 		return false
+	} else if unsafe { vmemcmp(s.str, p.str, p.len) == 0 } {
+		return true
 	}
-	for i in 0 .. p.len {
-		if unsafe { s.str[i] != p.str[i] } {
-			return false
-		}
-	}
-	return true
+	return false
 }
 
 // ends_with returns `true` if the string ends with `p`.
@@ -1513,13 +1510,10 @@ pub fn (s string) starts_with(p string) bool {
 pub fn (s string) ends_with(p string) bool {
 	if p.len > s.len {
 		return false
+	} else if unsafe { vmemcmp(s.str + s.len - p.len, p.str, p.len) == 0 } {
+		return true
 	}
-	for i in 0 .. p.len {
-		if unsafe { p.str[i] != s.str[s.len - p.len + i] } {
-			return false
-		}
-	}
-	return true
+	return false
 }
 
 // to_lower returns the string in all lowercase characters.