[PATCH] D39848: [RISCV] Support lowering FrameIndex

[Alex Bradbury via Phabricator via llvm-commits]

asb added a comment.

In https://reviews.llvm.org/D39848#932109, @kparzysz wrote:

> FrameIndex cannot be matched directly in patterns, but it can be matched by a ComplexPattern, which then can be used in selection patterns.
>
> We have this in Hexagon (the relevant part is the getTargetFrameIndex):


Thanks Krzysztof. This patch does something similar, in that I define a ComplexPattern in order to match a FrameIndex. The bit I remember having problems with was using the operand produced by the complex pattern with my targets standard GPR+imm load instructions. Of course my complexpattern was trying to get both the base and offset from the frameindex. Sticking to _just_ matching the frameindex in the ComplexPattern like your Hexagon snippets does seems more promising. I'll have another look tomorrow.


https://reviews.llvm.org/D39848