Add MOV optimizations and MOV_sum #3956
Merged
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This is a simple refactoring that replaces the A=B+C pattern throughout the code with a
MOV_sum
meta-instruction so we can apply optimizations consistently.This shouldn't have any performance implications one way or another, but it paves the way for the code refactoring in #3565
Split into a separate PR per discussion w / @magumagu
This change is