20 REGISTER ALLOCATION
Up until now, you’ve allocated space for every pseudoregister on the stack. This strategy is simple but painfully inefficient. Because instructions can’t always operate on values in memory directly, you sometimes need to generate extra instructions to copy values between these stack locations and registers. Even worse, the assembly code you generate has to access memory constantly, even though registers are faster. Now you’ll solve those problems. You’ll finish up your compiler by adding a register allocation ...
Get Writing a C Compiler now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
