[cfe-dev] Question on "phi-node-folding-threshold"

[Joan Lluch via cfe-dev]

Hi All,

For a custom backend I’m developing, where jumps are not particularly expensive, I want to reduce the phi-node-folding-threshold attribute value from the default 2 to just 1, as it produces better code in my case.

I first tried to set the attribute as a clang command line option, but it does not seem to be available. ( I tried “clang  -phi-node-folding-threshold=1” but this returns an “unknown argument” error)  

However, it works as intended if I replace the default value by hard coding in it in SimplifyCFG.cpp and recompiling clang

 My question is, Is there a way to set that attribute to a different value for a specific target?. Or at least to set it on the command line?

Thanks in advance

John
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