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author | Andrew Trick <atrick@apple.com> | 2013-09-06 17:32:36 +0000 |
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committer | Andrew Trick <atrick@apple.com> | 2013-09-06 17:32:36 +0000 |
commit | f9c2fa8341d4b7fe64ccd7beb5696d4a9934f5e9 (patch) | |
tree | 611ac6f041ee38a6bbbc3ee48dd8044a9bf032c8 /lib/CodeGen/MachineScheduler.cpp | |
parent | 38e61122f27a8ca4ef0578eaf6dc5242880d2918 (diff) | |
download | llvm-f9c2fa8341d4b7fe64ccd7beb5696d4a9934f5e9.tar.gz llvm-f9c2fa8341d4b7fe64ccd7beb5696d4a9934f5e9.tar.bz2 llvm-f9c2fa8341d4b7fe64ccd7beb5696d4a9934f5e9.tar.xz |
mi-sched: Reorder Cyclicpath (latency) and CriticalMax (pressure) heuristics.
The latency based scheduling could induce spills in some cases.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190177 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineScheduler.cpp')
-rw-r--r-- | lib/CodeGen/MachineScheduler.cpp | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/lib/CodeGen/MachineScheduler.cpp b/lib/CodeGen/MachineScheduler.cpp index b854a13f0a..7d957b5f30 100644 --- a/lib/CodeGen/MachineScheduler.cpp +++ b/lib/CodeGen/MachineScheduler.cpp @@ -2469,16 +2469,16 @@ void ConvergingScheduler::tryCandidate(SchedCandidate &Cand, TryCand, Cand, RegExcess)) return; - // For loops that are acyclic path limited, aggressively schedule for latency. - if (Rem.IsAcyclicLatencyLimited && tryLatency(TryCand, Cand, Zone)) - return; - // Avoid increasing the max critical pressure in the scheduled region. if (DAG->isTrackingPressure() && tryPressure(TryCand.RPDelta.CriticalMax, Cand.RPDelta.CriticalMax, TryCand, Cand, RegCritical)) return; + // For loops that are acyclic path limited, aggressively schedule for latency. + if (Rem.IsAcyclicLatencyLimited && tryLatency(TryCand, Cand, Zone)) + return; + // Keep clustered nodes together to encourage downstream peephole // optimizations which may reduce resource requirements. // |