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| author | Andrew Trick <atrick@apple.com> | 2013-06-17 21:45:18 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2013-06-17 21:45:18 +0000 |
| commit | 71b9d94d6ba2933df0f7936c44cdb344336d46ef (patch) | |
| tree | 6cdff48c390ca4b75ef95f3529e5f8c4ce4105e0 /lib/CodeGen/TargetSchedule.cpp | |
| parent | ad626132a9fea9f82065610bae552200d8cb1545 (diff) | |
| download | llvm-71b9d94d6ba2933df0f7936c44cdb344336d46ef.tar.gz llvm-71b9d94d6ba2933df0f7936c44cdb344336d46ef.tar.bz2 llvm-71b9d94d6ba2933df0f7936c44cdb344336d46ef.tar.xz | |
MI-Sched: handle ReadAdvance latencies as used by Swift.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184135 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/TargetSchedule.cpp')
| -rw-r--r-- | lib/CodeGen/TargetSchedule.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/CodeGen/TargetSchedule.cpp b/lib/CodeGen/TargetSchedule.cpp index 53cd11c5da..64ee9d1c46 100644 --- 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); - 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). |