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MIsched machine model: tablegen subtarget emitter improvement.

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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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176390 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2013-03-01 23:31:26 +00:00
parent 3b05d9f4db
commit c812110023
1 changed files with 14 additions and 1 deletions
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15
utils/TableGen/SubtargetEmitter.cpp
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@ -893,7 +893,20 @@ void SubtargetEmitter::GenSchedClassTables(const CodeGenProcModel &ProcModel,
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);