From 32c2f49bec26dcd14c395b4c2dc70c2122bcd1b1 Mon Sep 17 00:00:00 2001
From: Yohann Martel <yohann.martel@bhvr.com>
Date: Fri, 7 Mar 2025 14:24:17 -0500
Subject: [PATCH] Fix bswap with MSVC compiler

---
 XenonUtils/byteswap.h | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/XenonUtils/byteswap.h b/XenonUtils/byteswap.h
index 33e959f..3b7ebe4 100644
--- a/XenonUtils/byteswap.h
+++ b/XenonUtils/byteswap.h
@@ -2,17 +2,30 @@
 
 #include <cassert>
 
+#if defined(_MSC_VER)  // MSVC
+#include <intrin.h>
+#define BSWAP16(x) _byteswap_ushort(x)
+#define BSWAP32(x) _byteswap_ulong(x)
+#define BSWAP64(x) _byteswap_uint64(x)
+#elif defined(__GNUC__) || defined(__clang__)  // GCC or Clang
+#define BSWAP16(x) __builtin_bswap16(x)
+#define BSWAP32(x) __builtin_bswap32(x)
+#define BSWAP64(x) __builtin_bswap64(x)
+#else
+#error "Unsupported compiler"
+#endif
+
 template<typename T>
 inline T ByteSwap(T value)
 {
     if constexpr (sizeof(T) == 1)
         return value;
     else if constexpr (sizeof(T) == 2)
-        return static_cast<T>(__builtin_bswap16(static_cast<uint16_t>(value)));
+        return static_cast<T>(BSWAP16(static_cast<uint16_t>(value)));
     else if constexpr (sizeof(T) == 4)
-        return static_cast<T>(__builtin_bswap32(static_cast<uint32_t>(value)));
+        return static_cast<T>(BSWAP32(static_cast<uint32_t>(value)));
     else if constexpr (sizeof(T) == 8)
-        return static_cast<T>(__builtin_bswap64(static_cast<uint64_t>(value)));
+        return static_cast<T>(BSWAP64(static_cast<uint64_t>(value)));
 
     assert(false && "Unexpected byte size.");
     return value;