[LLVMdev] Target-specific code in non-Target part of LLVM

[Krzysztof Parzyszek]

Hi,
In the loop idiom recognition, it is relatively easy to detect a code 
pattern for which we have a special, internal function.

Since LoopIdiomRecognize.cpp is meant to be target-independent, adding 
code like "if (Hexagon) ..." doesn't seem acceptable.

The function implements something quite specific, which doesn't make it 
an obvious candidate for an intrinsic.

What is the preferred way to address this kind of a scenario?  Handling 
it in on the MI-level is possible, but it would take more work than 
piggy-backing on the existing IR-level code.  Any suggestions?

-Krzysztof

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