Rahman was distilling the concept of spatial locality.  Prior to optimizing spatial locality in large scale code, Firefox, Chrome, LLVM, Rahman also developed the newest theory on optimal spatial locality in his paper in POPL 2016.

Rahman Lavaee, John Criswell, Chen Ding:
Codestitcher: Inter-Procedural Basic Block Layout Optimization.  in 28th International Conference on Compiler Construction, February 2019, Washington DC, USA.