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Clean up.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31359 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-11-01 22:39:30 +00:00
parent 2c0565f8e0
commit 1dabb68ab4
1 changed files with 11 additions and 5 deletions
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16
lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
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@ -719,7 +719,14 @@ int BURegReductionPriorityQueue<SF>::CalcNodePriority(const SUnit *SU) {
return SethiUllmanNumber;
unsigned Opc = SU->Node->getOpcode();
if (Opc == ISD::TokenFactor || Opc == ISD::CopyToReg)
if (Opc == ISD::CopyFromReg && !isCopyFromLiveIn(SU))
// CopyFromReg should be close to its def because it restricts allocation
// choices. But if it is a livein then perhaps we want it closer to the
// uses so it can be coalesced.
SethiUllmanNumber = INT_MIN + 10;
else if (Opc == ISD::TokenFactor || Opc == ISD::CopyToReg)
// CopyToReg should be close to its uses to facilitate coalescing and avoid
// spilling.
SethiUllmanNumber = INT_MAX - 10;
else if (SU->NumSuccsLeft == 0)
// If SU does not have a use, i.e. it doesn't produce a value that would
@ -727,10 +734,9 @@ int BURegReductionPriorityQueue<SF>::CalcNodePriority(const SUnit *SU) {
// Give it a small SethiUllman number so it will be scheduled right before its
// predecessors that it doesn't lengthen their live ranges.
SethiUllmanNumber = INT_MIN + 10;
// FIXME: remove this else if? It seems to reduce register spills but often
// ends up increasing runtime. Need to investigate.
else if (SU->NumPredsLeft == 0 &&
(Opc != ISD::CopyFromReg || isCopyFromLiveIn(SU)))
else if (SU->NumPredsLeft == 0)
// If SU does not have a def, schedule it close to its uses because it does
// not lengthen any live ranges.
SethiUllmanNumber = INT_MAX - 10;
else {
int Extra = 0;