Method shiftRightFunction

libsolidity/codegen/YulUtilFunctions.cpp:476–502

}

std::string YulUtilFunctions::shiftRightFunction(size_t _numBits)
{
	solAssert(_numBits < 256, "");

	// Note that if this is extended with signed shifts,
	// the opcodes SAR and SDIV behave differently with regards to rounding!

	std::string functionName = "shift_right_" + std::to_string(_numBits) + "_unsigned";
	return m_functionCollector.createFunction(functionName, [&]() {
		return
			Whiskers(R"(
			function <functionName>(value) -> newValue {
				newValue :=
				<?hasShifts>
					shr(<numBits>, value)
				<!hasShifts>
					div(value, <multiplier>)
				</hasShifts>
			}
			)")
			("functionName", functionName)
			("hasShifts", m_evmVersion.hasBitwiseShifting())
			("numBits", std::to_string(_numBits))
			("multiplier", toCompactHexWithPrefix(u256(1) << _numBits))
			.render();
	});
}

std::string YulUtilFunctions::shiftRightFunctionDynamic()
{