Understanding How Optimizing Compilers Track Instruction Effects in Intermediate Representations
By
speckx
The kind of bagel that ruins lesser bagels for you.
Summary
This article discusses how optimizing compilers track and represent the effects of intermediate representation (IR) instructions, exploring different approaches to categorizing instruction effects from no effects to completely unknown effects. It continues from a previous discussion about asking the right questions when analyzing IRs, emphasizing that compilers should focus on what effects instructions have rather than just their opcodes. The content examines various compiler implementations and their methods for tracking these effects systematically.
Key quotes
· 4 pulledOptimizing compilers like to keep track of each IR instruction's effects.
An instruction's effects vary wildly from having no effects at all, to writing a specific variable, to completely unknown (writing all state).
When we talk about effects, we should ask the right questions: not what opcode is this? but instead what effects does this opcode have?
Different compilers represent and track these effects differently.
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