[llvm-dev] How to code backend with irregular memory address increment

winter Liu via llvm-dev llvm-dev at lists.llvm.org
Tue Apr 11 04:52:19 PDT 2017


Generayll, the memory address increases 1 every 8 bits, however on the platform I worked on, the meory address increases 1 every 16 bits. (And the minimal storage unit is 16 bits) As a result, the stack size and frame index is doubled, I just made the origin stack size divided by 2, and insert a code snippet in eliminateFrameIndex to deal with frame index. It works well in some cases. However, errors  rise when stack pointer register is moved to another register, as a result, it couldn't find all the frame index.

Is there a way to inform LLVM that the memory address increases in a irregular way?



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