GATE | GATE-CS-2017 (Set 1) | Question 38

Consider the expression (a-1) * ((( b + c ) / 3 )) + d)). Let X be the minimum number of registers required by an optimal code generation (without any register spill) algorithm for a load/store architecture, in which (i) only load and store instructions can have memory operands and (ii) arithmetic instructions can have only register or immediate operands The value of X is ________. Note : This questions appeared as Numerical Answer Type.