<p dir="ltr">Testable?</p>
<div class="gmail_quote">On Apr 6, 2013 10:31 AM, "Hal Finkel" <<a href="mailto:hfinkel@anl.gov">hfinkel@anl.gov</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Author: hfinkel<br>
Date: Fri Apr  5 18:28:58 2013<br>
New Revision: 178925<br>
<br>
URL: <a href="http://llvm.org/viewvc/llvm-project?rev=178925&view=rev" target="_blank">http://llvm.org/viewvc/llvm-project?rev=178925&view=rev</a><br>
Log:<br>
Correct the PPC A2 misprediction penalty<br>
<br>
The manual states that there is a minimum of 13 cycles from when the<br>
mispredicted branch is issued to when the correct branch target is<br>
issued.<br>
<br>
Modified:<br>
    llvm/trunk/lib/Target/PowerPC/PPCScheduleA2.td<br>
<br>
Modified: llvm/trunk/lib/Target/PowerPC/PPCScheduleA2.td<br>
URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/PowerPC/PPCScheduleA2.td?rev=178925&r1=178924&r2=178925&view=diff" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/PowerPC/PPCScheduleA2.td?rev=178925&r1=178924&r2=178925&view=diff</a><br>

==============================================================================<br>
--- llvm/trunk/lib/Target/PowerPC/PPCScheduleA2.td (original)<br>
+++ llvm/trunk/lib/Target/PowerPC/PPCScheduleA2.td Fri Apr  5 18:28:58 2013<br>
@@ -759,7 +759,7 @@ def PPCA2Model : SchedMachineModel {<br>
   let LoadLatency = 6; // Optimistic load latency assuming bypass.<br>
                        // This is overriden by OperandCycles if the<br>
                        // Itineraries are queried instead.<br>
-  let MispredictPenalty = 6;<br>
+  let MispredictPenalty = 13;<br>
<br>
   let Itineraries = PPCA2Itineraries;<br>
 }<br>
<br>
<br>
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</blockquote></div>