Allow targets to select source order pre-RA scheduler.

llvm-svn: 148033

2 files changed, 3 insertions, 1 deletions

diff --git a/llvm/include/llvm/Target/TargetLowering.h b/llvm/include/llvm/Target/TargetLowering.h
index 456966b5de1..5c891e940ed 100644
--- a/llvm/include/llvm/Target/TargetLowering.h
+++ b/llvm/include/llvm/Target/TargetLowering.h
@@ -56,6 +56,7 @@ namespace llvm {
   namespace Sched {
     enum Preference {
       None,             // No preference
+      Source,           // Follow source order.
       RegPressure,      // Scheduling for lowest register pressure.
       Hybrid,           // Scheduling for both latency and register pressure.
       ILP               // Scheduling for ILP in low register pressure mode.
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index bfb6dfa0b17..9f3969959b6 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -218,7 +218,8 @@ namespace llvm {
                                              CodeGenOpt::Level OptLevel) {
     const TargetLowering &TLI = IS->getTargetLowering();
 
-    if (OptLevel == CodeGenOpt::None)
+    if (OptLevel == CodeGenOpt::None ||
+        TLI.getSchedulingPreference() == Sched::Source)
       return createSourceListDAGScheduler(IS, OptLevel);
     if (TLI.getSchedulingPreference() == Sched::RegPressure)
       return createBURRListDAGScheduler(IS, OptLevel);