[llvm] r176390 - MIsched machine model: tablegen subtarget emitter improvement.
Andrew Trick
atrick at apple.com
Fri Mar 1 15:31:27 PST 2013
Author: atrick
Date: Fri Mar 1 17:31:26 2013
New Revision: 176390
URL: http://llvm.org/viewvc/llvm-project?rev=176390&view=rev
Log:
MIsched machine model: tablegen subtarget emitter improvement.
Fix the way resources are counted. I'm taking some time to cleanup the
way MachineScheduler handles in-order machine resources. Eventually
we'll need more PPC/Atom test cases in tree.
Modified:
llvm/trunk/utils/TableGen/SubtargetEmitter.cpp
Modified: llvm/trunk/utils/TableGen/SubtargetEmitter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/TableGen/SubtargetEmitter.cpp?rev=176390&r1=176389&r2=176390&view=diff
==============================================================================
--- llvm/trunk/utils/TableGen/SubtargetEmitter.cpp (original)
+++ llvm/trunk/utils/TableGen/SubtargetEmitter.cpp Fri Mar 1 17:31:26 2013
@@ -893,7 +893,20 @@ void SubtargetEmitter::GenSchedClassTabl
WPREntry.Cycles = Cycles[PRIdx];
else
WPREntry.Cycles = 1;
- WriteProcResources.push_back(WPREntry);
+ // If this resource is already used in this sequence, add the current
+ // entry's cycles so that the same resource appears to be used
+ // serially, rather than multiple parallel uses. This is important for
+ // in-order machine where the resource consumption is a hazard.
+ unsigned WPRIdx = 0, WPREnd = WriteProcResources.size();
+ for( ; WPRIdx != WPREnd; ++WPRIdx) {
+ if (WriteProcResources[WPRIdx].ProcResourceIdx
+ == WPREntry.ProcResourceIdx) {
+ WriteProcResources[WPRIdx].Cycles += WPREntry.Cycles;
+ break;
+ }
+ }
+ if (WPRIdx == WPREnd)
+ WriteProcResources.push_back(WPREntry);
}
}
WriteLatencies.push_back(WLEntry);
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