INTRODUCTION TO COMPILER DESIGN
OVERVIEW OF COMPILERS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Program Relevant Expression
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Partial Redundancy Elimination
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Partial Relocation Expression
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Permanent Recovery Expression
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Detailed explanation-1: -In compiler theory, partial redundancy elimination (PRE) is a compiler optimization that eliminates expressions that are redundant on some but not necessarily all paths through a program. PRE is a form of common subexpression elimination.
Detailed explanation-2: -Redundancy elimination operates on the assumption that it is faster to reuse a value than to recompute it. Building on that assumption, these methods identify as many redundant computations as possible and eliminate duplicate computation.
Detailed explanation-3: -In compiler theory, common subexpression elimination (CSE) is a compiler optimization that searches for instances of identical expressions (i.e., they all evaluate to the same value), and analyzes whether it is worthwhile replacing them with a single variable holding the computed value.