From 2afb88c4e01881c8daf6e7e18f0107fa37696a1d Mon Sep 17 00:00:00 2001
From: Ruben Vorderman <r.h.p.vorderman@lumc.nl>
Date: Mon, 11 Dec 2023 11:36:17 +0100
Subject: [PATCH] Using memcmp with a fixed length leads to very efficient
 assembly

---
 src/dnaio/_core.pyx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/dnaio/_core.pyx b/src/dnaio/_core.pyx
index 288a9f8..12f352d 100644
--- a/src/dnaio/_core.pyx
+++ b/src/dnaio/_core.pyx
@@ -591,7 +591,7 @@ cdef class FastqIter:
             second_header_start = sequence_end + 1
             remaining_bytes = (buffer_end - second_header_start)
             # Usually there is no second header, so we skip the memchr call.
-            if remaining_bytes > 2 and second_header_start[0] == b'+' and second_header_start[1] == b'\n':
+            if remaining_bytes > 2 and memcmp(second_header_start, b"+\n", 2) == 0:
                 second_header_end = second_header_start + 1
             else:
                 second_header_end = <char *>memchr(second_header_start, b'\n', <size_t>(remaining_bytes))