diff options
| author | Dan Gohman <gohman@apple.com> | 2008-12-16 02:38:22 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2008-12-16 02:38:22 +0000 |
| commit | 4ea8e85e19b844ef0ff704f27959b6a2ea7369f9 (patch) | |
| tree | a754a3e7aaf8341743f92efd10d896b778eedeb1 | |
| parent | c6b680eee58d27f4d38684c95e8fbfef61eb6558 (diff) | |
Add a simple target-independent heuristic to allow targets with no
instruction itinerary data to back-schedule loads.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61070 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/CodeGen/ScheduleDAGInstrs.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/CodeGen/ScheduleDAGInstrs.cpp b/lib/CodeGen/ScheduleDAGInstrs.cpp index 30e1846ef8..fa42d393a3 100644 --- a/lib/CodeGen/ScheduleDAGInstrs.cpp +++ b/lib/CodeGen/ScheduleDAGInstrs.cpp @@ -225,6 +225,12 @@ void ScheduleDAGInstrs::ComputeLatency(SUnit *SU) { // all nodes flagged together into this SUnit. SU->Latency = InstrItins.getLatency(SU->getInstr()->getDesc().getSchedClass()); + + // Simplistic target-independent heuristic: assume that loads take + // extra time. + if (InstrItins.isEmpty()) + if (SU->getInstr()->getDesc().mayLoad()) + SU->Latency += 2; } void ScheduleDAGInstrs::dumpNode(const SUnit *SU) const { |