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Add a really faster pre-RA scheduler (-pre-RA-sched=linearize). It doesn't use

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any scheduling heuristics nor does it build up any scheduling data structure
that other heuristics use. It essentially linearize by doing a DFA walk but
it does handle glues correctly.

IMPORTANT: it probably can't handle all the physical register dependencies so
it's not suitable for x86. It also doesn't deal with dbg_value nodes right now
so it's definitely is still WIP.

rdar://12474515


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166122 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2012-10-17 19:39:36 +00:00
parent 9aa6e0a134
commit d4f759696d
4 changed files with 165 additions and 3 deletions
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3
lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
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@@ -831,8 +831,7 @@ EmitSchedule(MachineBasicBlock::iterator &InsertPos) {
}
SmallVector<SDNode *, 4> GluedNodes;
for (SDNode *N = SU->getNode()->getGluedNode(); N;
N = N->getGluedNode())
for (SDNode *N = SU->getNode()->getGluedNode(); N; N = N->getGluedNode())
GluedNodes.push_back(N);
while (!GluedNodes.empty()) {
SDNode *N = GluedNodes.back();