diff options
Diffstat (limited to 'lib/CodeGen/LatencyPriorityQueue.cpp')
-rw-r--r-- | lib/CodeGen/LatencyPriorityQueue.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/CodeGen/LatencyPriorityQueue.cpp b/lib/CodeGen/LatencyPriorityQueue.cpp index 7ad9ac9b51..2e7b89c494 100644 --- a/lib/CodeGen/LatencyPriorityQueue.cpp +++ b/lib/CodeGen/LatencyPriorityQueue.cpp @@ -19,6 +19,14 @@ using namespace llvm; bool latency_sort::operator()(const SUnit *LHS, const SUnit *RHS) const { + // The isScheduleHigh flag allows nodes with wraparound dependencies that + // cannot easily be modeled as edges with latencies to be scheduled as + // soon as possible in a top-down schedule. + if (LHS->isScheduleHigh && !RHS->isScheduleHigh) + return false; + if (!LHS->isScheduleHigh && RHS->isScheduleHigh) + return true; + unsigned LHSNum = LHS->NodeNum; unsigned RHSNum = RHS->NodeNum; |