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| author | Dan Gohman <gohman@apple.com> | 2008-12-16 03:35:01 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2008-12-16 03:35:01 +0000 |
| commit | 8749b61178228ba1fb2668034d79da1b247173d7 (patch) | |
| tree | 636b5ac610b13cb87c049c0be682018b5a610d2f /lib/CodeGen/LatencyPriorityQueue.cpp | |
| parent | 9a65d6afc203fb8e44a807f84e3d370f16b08a5a (diff) | |
| download | llvm-8749b61178228ba1fb2668034d79da1b247173d7.tar.gz llvm-8749b61178228ba1fb2668034d79da1b247173d7.tar.bz2 llvm-8749b61178228ba1fb2668034d79da1b247173d7.tar.xz | |
Add initial support for back-scheduling address computations,
especially in the case of addresses computed from loop induction
variables.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61075 91177308-0d34-0410-b5e6-96231b3b80d8
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; |