[Bug]: USR call is removed by optimizer

[oskostenko]

Contact Details

No response

Compiler version

v1.18.4

What happened?

sub DoSomething
    print "YES"
end sub

a = usr(@DoSomething)

When compiled with the default optimization level, this program prints nothing, while it is expected to print YES.

The compiler's optimizer detects the value assigned to the variable a is unused and removes the whole instruction, including the usr call. However, usr is not a pure function so it must not be removed by optimizer.

Workaround: instead of usr write your own sub like this:

sub fastcall Call(address as uinteger)
    asm
        jp (hl)
    end asm
end sub

Call @DoSomething

Error and Warning messages

warning: [W150] Variable 'a' is never used

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