[llvm-dev] maximum value for alignstack function attribute?

[Andrew Kelley via llvm-dev]

I have this test case in my frontend, which is triggering an assert in llvm
master branch:

fn fnWithAlignedStack() -> i32 {
    @setAlignStack(1024);
    return 1234;
}

It sets alignstack=1024 in the function attributes (see
http://llvm.org/docs/LangRef.html#function-attributes). It's tripping an
assert:

llvm/lib/IR/Attributes.cpp:134: static llvm::Attribute
llvm::Attribute::getWithStackAlignment(llvm::LLVMContext&, uint64_t):
Assertion `Align <= 0x100 && "Alignment too large."'

Is 0x100 the correct maximum alignstack value? Can I submit a patch to
document this in LangRef.html?

Regards,
Andrew Kelley
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