We implement logic to convert a byte offset into a sequence of GEP indices for that offset in a number of places. This patch adds a DataLayout::getGEPIndicesForOffset() method, which implements the core logic. I've updated SROA, ConstantFolding and InstCombine to use it, and there's a few more places where it looks relevant. Differential Revision: https://reviews.llvm.org/D110043
This directory contains test cases for the instcombine transformation. The dated tests are actual bug tests, whereas the named tests are used to test for features that the this pass should be capable of performing.