Adding marker (.dot) instructions at procedure prologue/epilogue

[Nikolaos Kavvadias]

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Hi Ian

thanks for the info. BTW (in respect to some previous discussion)
i've added partial predication (i.e. "select" instruction) to my
backend. I resorted to a "4-operand" select instruction (i.e. takes a
predicate, a dest and two src operands) than conditional moves (i.e.
conditional move is a subcase). The code produced seems to take
advantage of if-then-else structures that i've set up, even on
not-so-obvious cases. I'm currently checking sanity via cross-simulations.

thanks again.

Nikos Kavvadias

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