condition flags USE in AD instruct

[Christian Thalinger]

Hi!

Is there a way to USE condition flags in instruct effects, like:

instruct foo(rFlagsReg cr) {
  effect(USE cr)
...
}

ADLC complains about that with:

illegal USE of non-input: rFlagsReg cr

However I see something similar for minI_rReg in x86_64.ad where another
instruct, namely cmovI_reg_g, uses cr and the later is used in an expand
inside the former.  Is that a workaround/intentional/the only way to do
it?

-- Christian