[PATCH] D80028: [AArch64] Add support of labels substraction to mov

[Oliver Stannard (Linaro) via Phabricator via llvm-commits]

ostannard added a comment.

- Testing that the expression is the subtraction of two SymbolRefs seems needlessly restrictive, could we accept any expression, and reject it in the AsmBackend if it can't be fully resolved or converted to a relocation?
- Does this check that the value fits into a 16 bit immediate? The GNU assembler also seems to accept expressions which fit into a MOVZ/MOVN with a shift, though I can't see that being very useful for expressions involving symbol addresses.
- This needs tests.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D80028/new/

https://reviews.llvm.org/D80028