Removed signed shift right from the utilities.

6 files changed, 24 insertions, 24 deletions

diff --git a/libsolidity/codegen/ABIFunctions.cpp b/libsolidity/codegen/ABIFunctions.cpp
index 6c4ddc02..3e3aa0ae 100644
--- a/libsolidity/codegen/ABIFunctions.cpp
+++ b/libsolidity/codegen/ABIFunctions.cpp
@@ -371,7 +371,7 @@ string ABIFunctions::conversionFunction(Type const& _from, Type const& _to)
 			if (toCategory == Type::Category::Integer)
 				body =
 					Whiskers("converted := <convert>(<shift>(value))")
-					("shift", shiftRightFunction(256 - from.numBytes() * 8, false))
+					("shift", shiftRightFunction(256 - from.numBytes() * 8))
 					("convert", conversionFunction(IntegerType(from.numBytes() * 8), _to))
 					.render();
 			else
@@ -458,8 +458,8 @@ string ABIFunctions::splitExternalFunctionIdFunction()
 			}
 		)")
 		("functionName", functionName)
-		("shr32", shiftRightFunction(32, false))
-		("shr64", shiftRightFunction(64, false))
+		("shr32", shiftRightFunction(32))
+		("shr64", shiftRightFunction(64))
 		.render();
 	});
 }
@@ -831,7 +831,7 @@ string ABIFunctions::abiEncodingFunctionCompactStorageArray(
 			templ("encodeToMemoryFun", encodeToMemoryFun);
 			std::vector<std::map<std::string, std::string>> items(itemsPerSlot);
 			for (size_t i = 0; i < itemsPerSlot; ++i)
-				items[i]["shiftRightFun"] = shiftRightFunction(i * storageBytes * 8, false);
+				items[i]["shiftRightFun"] = shiftRightFunction(i * storageBytes * 8);
 			templ("items", items);
 			return templ.render();
 		}
@@ -927,7 +927,7 @@ string ABIFunctions::abiEncodingFunctionStruct(
 					}
 					else
 						memberTempl("preprocess", "");
-					memberTempl("retrieveValue", shiftRightFunction(intraSlotOffset * 8, false) + "(slotValue)");
+					memberTempl("retrieveValue", shiftRightFunction(intraSlotOffset * 8) + "(slotValue)");
 				}
 				else
 				{
@@ -1434,14 +1434,15 @@ string ABIFunctions::shiftLeftFunction(size_t _numBits)
 	}
 }
 
-string ABIFunctions::shiftRightFunction(size_t _numBits, bool _signed)
+string ABIFunctions::shiftRightFunction(size_t _numBits)
 {
 	solAssert(_numBits < 256, "");
 
-	string functionName = "shift_right_" + to_string(_numBits) + (_signed ? "_signed" : "_unsigned");
+	// Note that if this is extended with signed shifts,
+	// the opcodes SAR and SDIV behave differently with regards to rounding!
 
-	// NOTE: SAR rounds differently than SDIV
-	if (m_evmVersion.hasBitwiseShifting() && !_signed)
+	string functionName = "shift_right_" + to_string(_numBits) + "_unsigned";
+	if (m_evmVersion.hasBitwiseShifting())
 	{
 		return createFunction(functionName, [&]() {
 			return
@@ -1461,11 +1462,10 @@ string ABIFunctions::shiftRightFunction(size_t _numBits, bool _signed)
 			return
 				Whiskers(R"(
 				function <functionName>(value) -> newValue {
-					newValue := <div>(value, <multiplier>)
+					newValue := div(value, <multiplier>)
 				}
 				)")
 				("functionName", functionName)
-				("div", _signed ? "sdiv" : "div")
 				("multiplier", toCompactHexWithPrefix(u256(1) << _numBits))
 				.render();
 		});
diff --git a/libsolidity/codegen/ABIFunctions.h b/libsolidity/codegen/ABIFunctions.h
index 41bb70b2..db4d40f5 100644
--- a/libsolidity/codegen/ABIFunctions.h
+++ b/libsolidity/codegen/ABIFunctions.h
@@ -195,7 +195,7 @@ private:
 	std::string copyToMemoryFunction(bool _fromCalldata);
 
 	std::string shiftLeftFunction(size_t _numBits);
-	std::string shiftRightFunction(size_t _numBits, bool _signed);
+	std::string shiftRightFunction(size_t _numBits);
 	/// @returns the name of a function that rounds its input to the next multiple
 	/// of 32 or the input if it is a multiple of 32.
 	std::string roundUpFunction();
diff --git a/libsolidity/codegen/CompilerUtils.cpp b/libsolidity/codegen/CompilerUtils.cpp
index 45ad1f47..48b77eb3 100644
--- a/libsolidity/codegen/CompilerUtils.cpp
+++ b/libsolidity/codegen/CompilerUtils.cpp
@@ -599,15 +599,15 @@ void CompilerUtils::splitExternalFunctionType(bool _leftAligned)
 	if (_leftAligned)
 	{
 		m_context << Instruction::DUP1;
-		rightShiftNumberOnStack(64 + 32, false);
+		rightShiftNumberOnStack(64 + 32);
 		// <input> <address>
 		m_context << Instruction::SWAP1;
-		rightShiftNumberOnStack(64, false);
+		rightShiftNumberOnStack(64);
 	}
 	else
 	{
 		m_context << Instruction::DUP1;
-		rightShiftNumberOnStack(32, false);
+		rightShiftNumberOnStack(32);
 		m_context << ((u256(1) << 160) - 1) << Instruction::AND << Instruction::SWAP1;
 	}
 	m_context << u256(0xffffffffUL) << Instruction::AND;
@@ -675,7 +675,7 @@ void CompilerUtils::convertType(
 			// conversion from bytes to integer. no need to clean the high bit
 			// only to shift right because of opposite alignment
 			IntegerType const& targetIntegerType = dynamic_cast<IntegerType const&>(_targetType);
-			rightShiftNumberOnStack(256 - typeOnStack.numBytes() * 8, false);
+			rightShiftNumberOnStack(256 - typeOnStack.numBytes() * 8);
 			if (targetIntegerType.numBits() < typeOnStack.numBytes() * 8)
 				convertType(IntegerType(typeOnStack.numBytes() * 8), _targetType, _cleanupNeeded);
 		}
@@ -1242,7 +1242,7 @@ unsigned CompilerUtils::loadFromMemoryHelper(Type const& _type, bool _fromCallda
 		bool leftAligned = _type.category() == Type::Category::FixedBytes;
 		// add leading or trailing zeros by dividing/multiplying depending on alignment
 		int shiftFactor = (32 - numBytes) * 8;
-		rightShiftNumberOnStack(shiftFactor, false);
+		rightShiftNumberOnStack(shiftFactor);
 		if (leftAligned)
 			leftShiftNumberOnStack(shiftFactor);
 	}
@@ -1271,14 +1271,14 @@ void CompilerUtils::leftShiftNumberOnStack(unsigned _bits)
 		m_context << (u256(1) << _bits) << Instruction::MUL;
 }
 
-void CompilerUtils::rightShiftNumberOnStack(unsigned _bits, bool _isSigned)
+void CompilerUtils::rightShiftNumberOnStack(unsigned _bits)
 {
 	solAssert(_bits < 256, "");
-	// NOTE: SAR rounds differently than SDIV
-	if (m_context.evmVersion().hasBitwiseShifting() && !_isSigned)
+	// NOTE: If we add signed right shift, SAR rounds differently than SDIV
+	if (m_context.evmVersion().hasBitwiseShifting())
 		m_context << _bits << Instruction::SHR;
 	else
-		m_context << (u256(1) << _bits) << Instruction::SWAP1 << (_isSigned ? Instruction::SDIV : Instruction::DIV);
+		m_context << (u256(1) << _bits) << Instruction::SWAP1 << Instruction::DIV;
 }
 
 unsigned CompilerUtils::prepareMemoryStore(Type const& _type, bool _padToWords)
diff --git a/libsolidity/codegen/CompilerUtils.h b/libsolidity/codegen/CompilerUtils.h
index 476a7559..8e3a8a5d 100644
--- a/libsolidity/codegen/CompilerUtils.h
+++ b/libsolidity/codegen/CompilerUtils.h
@@ -254,7 +254,7 @@ public:
 	/// Helper function to shift top value on the stack to the right.
 	/// Stack pre: <value> <shift_by_bits>
 	/// Stack post: <shifted_value>
-	void rightShiftNumberOnStack(unsigned _bits, bool _isSigned = false);
+	void rightShiftNumberOnStack(unsigned _bits);
 
 	/// Appends code that computes tha Keccak-256 hash of the topmost stack element of 32 byte type.
 	void computeHashStatic();
diff --git a/libsolidity/codegen/ExpressionCompiler.cpp b/libsolidity/codegen/ExpressionCompiler.cpp
index 019867c5..a8222e21 100644
--- a/libsolidity/codegen/ExpressionCompiler.cpp
+++ b/libsolidity/codegen/ExpressionCompiler.cpp
@@ -548,7 +548,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 
 			if (m_context.runtimeContext())
 				// We have a runtime context, so we need the creation part.
-				utils().rightShiftNumberOnStack(32, false);
+				utils().rightShiftNumberOnStack(32);
 			else
 				// Extract the runtime part.
 				m_context << ((u256(1) << 32) - 1) << Instruction::AND;
diff --git a/libsolidity/codegen/LValue.cpp b/libsolidity/codegen/LValue.cpp
index e19cf41e..77684683 100644
--- a/libsolidity/codegen/LValue.cpp
+++ b/libsolidity/codegen/LValue.cpp
@@ -267,7 +267,7 @@ void StorageItem::storeValue(Type const& _sourceType, SourceLocation const& _loc
 			else if (m_dataType->category() == Type::Category::FixedBytes)
 			{
 				solAssert(_sourceType.category() == Type::Category::FixedBytes, "source not fixed bytes");
-				CompilerUtils(m_context).rightShiftNumberOnStack(256 - 8 * dynamic_cast<FixedBytesType const&>(*m_dataType).numBytes(), false);
+				CompilerUtils(m_context).rightShiftNumberOnStack(256 - 8 * dynamic_cast<FixedBytesType const&>(*m_dataType).numBytes());
 			}
 			else
 			{