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MI-Sched: handle ReadAdvance latencies as used by Swift.
[oota-llvm.git]
/
lib
/
CodeGen
/
TargetSchedule.cpp
diff --git
a/lib/CodeGen/TargetSchedule.cpp
b/lib/CodeGen/TargetSchedule.cpp
index 53cd11c5daa633a22db433f226b68cccc63478f9..64ee9d1c464eac92aba19c80e6ec1b8f7d40b429 100644
(file)
--- a/
lib/CodeGen/TargetSchedule.cpp
+++ b/
lib/CodeGen/TargetSchedule.cpp
@@
-201,7
+201,10
@@
unsigned TargetSchedModel::computeOperandLatency(
if (UseDesc->NumReadAdvanceEntries == 0)
return Latency;
unsigned UseIdx = findUseIdx(UseMI, UseOperIdx);
if (UseDesc->NumReadAdvanceEntries == 0)
return Latency;
unsigned UseIdx = findUseIdx(UseMI, UseOperIdx);
- return Latency - STI->getReadAdvanceCycles(UseDesc, UseIdx, WriteID);
+ int Advance = STI->getReadAdvanceCycles(UseDesc, UseIdx, WriteID);
+ if (Advance > 0 && (unsigned)Advance > Latency) // unsigned wrap
+ return 0;
+ return Latency - Advance;
}
// If DefIdx does not exist in the model (e.g. implicit defs), then return
// unit latency (defaultDefLatency may be too conservative).
}
// If DefIdx does not exist in the model (e.g. implicit defs), then return
// unit latency (defaultDefLatency may be too conservative).