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ARM getOperandLatency should return -1 for unknown, consistent with API

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158162 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2012-06-07 19:41:58 +00:00
parent ed7a51e692
commit f377071bf8
1 changed files with 4 additions and 1 deletions
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5
lib/Target/ARM/ARMBaseInstrInfo.cpp
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@ -2574,8 +2574,9 @@ ARMBaseInstrInfo::getOperandLatency(const InstrItineraryData *ItinData,
DefMI->isRegSequence() || DefMI->isImplicitDef()) {
return 1;
}
// No operand latency. The caller may fall back to getInstrLatency.
if (!ItinData || ItinData->isEmpty())
return DefMI->mayLoad() ? 3 : 1;
return -1;
const MCInstrDesc *DefMCID = &DefMI->getDesc();
const MCInstrDesc *UseMCID = &UseMI->getDesc();
@ -3057,6 +3058,8 @@ hasHighOperandLatency(const InstrItineraryData *ItinData,
// Hoist VFP / NEON instructions with 4 or higher latency.
int Latency = getOperandLatency(ItinData, DefMI, DefIdx, UseMI, UseIdx);
if (Latency < 0)
Latency = getInstrLatency(ItinData, DefMI);
if (Latency <= 3)
return false;
return DDomain == ARMII::DomainVFP || DDomain == ARMII::DomainNEON ||