[LLVMdev] How to specify the subtarget instruction set for LLVM unit in ARM-backend?

[Anton Korobeynikov]

Hello

> compiler does not support this feature, please specify the minimal unit
> (basic block, entire function or anything else) that the current version
> of the compiler is able to translate with an indication of the subtarget
> instruction set.
Subtarget features are specified on per-module basis. It might be good to allow
certain features to be applied on per-function level. Patches are welcome :)

> Also, I wonder whether an LLVM pass can be added to the ARM-backend (if
> so, please explain how).
Yes, it is possible. There are plenty of examples in the current
codebase. See e.g.
lib/Target/ARM/ARMTargetMachine.cpp

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University