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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.

llvm-svn: 117518
This commit is contained in:
Evan Cheng 2010-10-28 01:46:29 +00:00
parent b78530f9b0
commit a07cd58978
1 changed files with 3 additions and 0 deletions
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3
lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
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@ -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);