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...from. This is a part of effort toward minimizing code size presented in here <https://llvm.org/devmtg/2020-02-23/slides/Kyungwoo-GlobalMachineOutlinerForThinLTO.pdf>. In particular, this RFC is about optimizing prolog and epilog for size. *Homogeneous Prolog and Epilog for Size Optimization, D76570 <https://reviews.llvm.org/D76570>:* Prolog and epilog to handle callee-save registers tend to be irregular with different immediate offsets, which are not often being outlined (by machine outliner) when optimizing for size. From D18619, combining stack operations stretched irregularity furth...

...t of effort toward minimizing code size presented in here > <https://llvm.org/devmtg/2020-02-23/slides/Kyungwoo-GlobalMachineOutlinerForThinLTO.pdf>. > In particular, this RFC is about optimizing prolog and epilog for size. > > *Homogeneous Prolog and Epilog for Size Optimization, D76570 > <https://reviews.llvm.org/D76570>:* > > Prolog and epilog to handle callee-save registers tend to be irregular > with different immediate offsets, which are not often being outlined (by > machine outliner) when optimizing for size. From D18619, combining stack > operations...