Compiling to branch table

[Stephen_Vavasis]

Last year, poring over the output of @code_native I discovered that my code of the form

    if i == 1
        dothis()
    elseif i == 2
        dotheother()
    elseif i == 3
        dothethirdthing()
    end

was in fact compiling to a jump-table. (This was causing a bug in my program because there was an error in LLVM address computation. That LLVM bug has been fixed, I believe.) Here is the old thread:

Match LLVM with Julia source?

Thanks for the help! Using these techniques plus poring over GDB, I have tracked down the exact location of the ReadOnlyMemoryError() in my code, but I still don’t know what is causing it. It appears to be a bug either in the Julia run-time system or the LLVM run-time system. My code (0.6.2) looks like this: if whichderiv == -1 [snip] elseif whichderiv == 0 [snip] elseif whichderiv == 1 [snip] els…