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Added major new capabilities to scheduler (only BURR for now) to support physical register dependency. The BURR scheduler can now backtrace and duplicate instructions in order to avoid "expensive / impossible to copy" values (e.g. status flag EFLAGS for x86) from being clobbered.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42284 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-09-25 01:54:36 +00:00
parent a3602685b3
commit a6fb1b6743
6 changed files with 658 additions and 178 deletions
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2
lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
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@@ -281,7 +281,7 @@ namespace llvm {
GraphWriter<ScheduleDAG*> &GW) {
GW.emitSimpleNode(0, "plaintext=circle", "GraphRoot");
if (G->DAG.getRoot().Val)
GW.emitEdge(0, -1, G->SUnitMap[G->DAG.getRoot().Val], -1, "");
GW.emitEdge(0, -1, G->SUnitMap[G->DAG.getRoot().Val].front(), -1, "");
}
};
}