[llvm-dev] Optimize from 'for' to 'do-while' when setting #pragma clang loop min(1)

[Qianyi (Compiler) via llvm-dev]

To whom it may concern,

I'm implementing one pragma to optimize "for" loop.
We assume the loop will run at least 1 times when we set following pragma:
#pragma clang loop min(1)
for(i = 0; i < n; I ++)
Then we can remove the first branch which go to exit block when "n < =0".

This is one picture which show llvm how to do loop rotation.
[cid:image002.jpg at 01D464B5.AC4BE460]

Is it the proper place(LoopRotation.cpp) to implement my feature?
Or is there more suitable place to do it?

Best regards,
Klarke

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