Allow creating LLVM constants directly from u256

libevmjit/GasMeter.cpp

@@ -126,9 +126,6 @@ void GasMeter::countSStore(Ext& _ext, llvm::Value* _index, llvm::Value* _newValu
 {
 	assert(!m_checkCall); // Everything should've been commited before
 
-	static const auto updateCost = static_cast<uint64_t>(c_sstoreResetGas); // TODO: Discuss naming (DB names look better)
-	static const auto insertCost = static_cast<uint64_t>(c_sstoreSetGas);
-
 	auto oldValue = _ext.store(_index);
 	auto oldValueIsZero = m_builder.CreateICmpEQ(oldValue, Constant::get(0), "oldValueIsZero");
 	auto newValueIsZero = m_builder.CreateICmpEQ(_newValue, Constant::get(0), "newValueIsZero");
@@ -136,7 +133,7 @@ void GasMeter::countSStore(Ext& _ext, llvm::Value* _index, llvm::Value* _newValu
 	auto newValueIsntZero = m_builder.CreateICmpNE(_newValue, Constant::get(0), "newValueIsntZero");
 	auto isInsert = m_builder.CreateAnd(oldValueIsZero, newValueIsntZero, "isInsert");
 	auto isDelete = m_builder.CreateAnd(oldValueIsntZero, newValueIsZero, "isDelete");
-	auto cost = m_builder.CreateSelect(isInsert, Constant::get(insertCost), Constant::get(updateCost), "cost");
+	auto cost = m_builder.CreateSelect(isInsert, Constant::get(c_sstoreSetGas), Constant::get(c_sstoreResetGas), "cost");
 	cost = m_builder.CreateSelect(isDelete, Constant::get(0), cost, "cost");
 	createCall(m_gasCheckFunc, cost);
 }

libevmjit/Type.cpp

@@ -41,6 +41,14 @@ llvm::ConstantInt* Constant::get(uint64_t _n)
 	return llvm::ConstantInt::get(Type::i256, _n);
 }
 
+llvm::ConstantInt* Constant::get(u256 _n)
+{
+	auto limbs = _n.backend().limbs();
+	auto words = reinterpret_cast<uint64_t*>(limbs);
+	llvm::APInt n(256, 4, words);
+	return static_cast<llvm::ConstantInt*>(llvm::ConstantInt::get(Type::i256, n));
+}
+
 llvm::ConstantInt* Constant::get(ReturnCode _returnCode)
 {
 	return llvm::ConstantInt::get(Type::MainReturn, static_cast<uint64_t>(_returnCode));

libevmjit/Type.h

@@ -3,6 +3,7 @@
 
 #include <llvm/IR/Type.h>
 #include <llvm/IR/Constants.h>
+#include <libdevcore/Common.h>
 
 namespace dev
 {
@@ -50,7 +51,8 @@ enum class ReturnCode
 struct Constant
 {
 	/// Returns word-size constant
-	static llvm::ConstantInt* get(uint64_t _n); // TODO: add overload with u256
+	static llvm::ConstantInt* get(uint64_t _n);
+	static llvm::ConstantInt* get(u256 _n);
 
 	static llvm::ConstantInt* get(ReturnCode _returnCode);
 };