Add support for Big Endian architectures [Delivers #79877740]

libevmjit/Endianness.h

@@ -1,6 +1,8 @@
 
 #pragma once
 
+#include <boost/detail/endian.hpp>
+
 #include <llvm/IR/IRBuilder.h>
 
 namespace dev
@@ -10,14 +12,19 @@ namespace eth
 namespace jit
 {
 
-class Endianness
+struct Endianness
 {
-public:
 
+#if defined(BOOST_LITTLE_ENDIAN)
 	static llvm::Value* toBE(llvm::IRBuilder<>& _builder, llvm::Value* _word) { return bswap(_builder, _word); }
-
 	static llvm::Value* toNative(llvm::IRBuilder<>& _builder, llvm::Value* _word) { return bswap(_builder, _word); }
 
+#elif defined(BOOST_BIG_ENDIAN)
+	static llvm::Value* toBE(llvm::IRBuilder<>&, llvm::Value* _word) { return _word; }
+	static llvm::Value* toNative(llvm::IRBuilder<>&, llvm::Value* _word) { return _word; }
+
+#endif	// Add support for PDP endianness if needed
+
 private:
 	static llvm::Value* bswap(llvm::IRBuilder<>& _builder, llvm::Value* _word);
 };