From d914a7a81a7bbbf070ba9fa3fa0f9279121de2c1 Mon Sep 17 00:00:00 2001
From: ringabout <43030857+ringabout@users.noreply.github.com>
Date: Thu, 9 Apr 2026 10:09:28 +0800
Subject: [PATCH] optimizes `setLen` for orc; disabling ranging checks

---
 lib/system/seqs_v2.nim | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/system/seqs_v2.nim b/lib/system/seqs_v2.nim
index fefb6e914c..511bb87d82 100644
--- a/lib/system/seqs_v2.nim
+++ b/lib/system/seqs_v2.nim
@@ -262,8 +262,11 @@ proc setLen[T](s: var seq[T], newlen: Natural) {.nodestroy.} =
         if xu.p == nil or (xu.p.cap and not strlitFlag) < newlen:
           xu.p = cast[typeof(xu.p)](prepareSeqAddUninit(oldLen, xu.p, newlen - oldLen, sizeof(T), alignof(T)))
         xu.len = newlen
+
+        {.push overflowChecks: off.}
         for i in oldLen..<newlen:
           xu.p.data[i] = default(T)
+        {.pop.}
 
 proc newSeq[T](s: var seq[T], len: Natural) =
   shrink(s, 0)