OpenCL compiler crashed when compile some piece of simple code

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There are hundreds of bugs in Altera's compiler that could lead to such crashes. Your code snippet crashes the compiler all the way to the recent v18.0. In such cases, the only choices are to either change the design strategy to bypass the crash, or report it to Altera and then wait multiple months until they release a new version which might include a fix.

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that's a bad news, it's hard to say the Altera's OpenCL toolchain is good enough to develop some kind of industrial-grade product. I think I should give up and looking for some alternative solutions