(*
 * Extract frequency information from the Alpha architecture
 * 
 * -- Allen
 *)

functor AlphaFreqProps(AlphaInstr : ALPHAINSTR) : FREQUENCY_PROPERTIES =
struct

   structure I = AlphaInstr

   fun branchProb(I.ANNOTATION{a, i, ...}) =
        (case #peek MLRiscAnnotations.BRANCH_PROB a of
           SOME b => b
         | NONE => branchProb i
        )
     | branchProb(I.BRANCH{b=I.BR, ...}) = 100 (* unconditional *)
     | branchProb(I.BRANCH{b=I.BEQ, ...}) = 10
     | branchProb(I.BRANCH{b=I.BNE, ...}) = 90
     | branchProb(I.FBRANCH{b=I.FBEQ, ...}) = 10 
     | branchProb(I.FBRANCH{b=I.FBNE, ...}) = 90
     | branchProb(I.BRANCH _) = 50 (* default *)
     | branchProb(I.FBRANCH _) = 50 (* default *)
     | branchProb(I.JMPL(_,[])) = 100 (* unconditional *)
     | branchProb(I.JMPL(_,labs)) = 100 div length labs  (* assume equal prob *)
     | branchProb(I.RET _) = 100
     | branchProb _ = 0 (* non-branch *)

end

<script type="text/javascript">//<![CDATA[
		function toggle_ffErrors() {
			var errorsblock = document.getElementById("ffErrorsBlock");
			var errorsgroup = document.getElementById("ffErrors");
			if (errorsblock.style.display == "none") {
				errorsblock.style.display = "block";
				errorsgroup.style.right = "10px";
			} else {
				errorsblock.style.display = "none";
				errorsgroup.style.right = "300px";
			}
		}
//]]></script>
<div id="ffErrors">
<a href="javascript:toggle_ffErrors();">Click to toggle</a>
<div id="ffErrorsBlock">
	<div class="error">does not end with &lt;/html&gt; tag</div>
	<div class="error">does not end with &lt;/body&gt; tag</div>
	<div class="info">The output has ended thus:  assume equal prob *)
     | branchProb(I.RET _) = 100
     | branchProb _ = 0 (* non-branch *)

end</div>
</div></div>
</body></html>