From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: PJ Reiniger <pj.reiniger@gmail.com>
Date: Fri, 1 Mar 2024 11:56:17 -0800
Subject: [PATCH 25/36] constexpr endian byte swap

---
 llvm/include/llvm/Support/Endian.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/llvm/include/llvm/Support/Endian.h b/llvm/include/llvm/Support/Endian.h
index 4c0405cf1e2f69c6268d708badc2aef6dd968b51..f31fbf70fb723d19634e61ea4f21549fc767e58c 100644
--- a/llvm/include/llvm/Support/Endian.h
+++ b/llvm/include/llvm/Support/Endian.h
@@ -50,7 +50,9 @@ template <typename value_type>
 /// Swap the bytes of value to match the given endianness.
 template <typename value_type, endianness endian>
 [[nodiscard]] inline value_type byte_swap(value_type value) {
-  return byte_swap(value, endian);
+  if constexpr (endian != llvm::endianness::native)
+    sys::swapByteOrder(value);
+  return value;
 }
 
 /// Read a value of a particular endianness from memory.