What is 'Instruction Selection' in code generation?
Instruction selection translates abstract intermediate operations into specific target machine assembly instructions, matching tree patterns against target machine instruction templates.
Tree-rewriting and Pattern Matching (e.g., using BURG or twig tools) are widely used for which code generation task?
Target instructions are modeled as tree patterns with associated costs. Tree-covering algorithms use dynamic programming or pattern matching to select optimal instruction trees.
What is 'Instruction Scheduling' during code generation?
Instruction scheduling reorders assembly instructions to prevent pipeline stalls (e.g. load-use delays) while respecting data dependency constraints.
In the simple Code Generator algorithm using 'getreg()', what information does the Next-Use analysis provide?
Next-use information tracks whether a variable has a future read within the basic block. If a variable has no next use, its register can be immediately freed.
In a code generator, what is the 'Register Descriptor'?
A Register Descriptor maintains the current status of each CPU register, recording which variable names have their current values stored in that register.