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Fix a major bug in operand latency computation. The use index must be adjusted

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by the number of defs first for it to match the instruction itinerary.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117518 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-10-28 01:46:29 +00:00
parent e49406fd63
commit 7c88cdcc3b
1 changed files with 3 additions and 0 deletions

3
lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp

@ -454,6 +454,9 @@ void ScheduleDAGSDNodes::ComputeOperandLatency(SDNode *Def, SDNode *Use,
return;
unsigned DefIdx = Use->getOperand(OpIdx).getResNo();
if (Use->isMachineOpcode())
// Adjust the use operand index by num of defs.
OpIdx += TII->get(Use->getMachineOpcode()).getNumDefs();
int Latency = TII->getOperandLatency(InstrItins, Def, DefIdx, Use, OpIdx);
if (Latency >= 0)
dep.setLatency(Latency);