Answered: Consider the grammar rule E→E1−E2 for…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Consider the grammar rule E→E1−E2 for arithmetic expressions. The code generated is targeted to a CPU having a single user register. The subtraction operation requires the first operand to be in the register. If E1 and E2 do not have any common sub-expression, in order to get the shortest possible code. A E1 should be evaluated first B E2 should be evaluated first C Evaluation of E1 and E2 should necessarily be interleaved D Order to evaluation of E1 and E2 is of no consequence?

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