ARM: Enable MachineScheduler and disable PostRAScheduler for swift.

[oota-llvm.git] / lib / Target / ARM / ARMSubtarget.cpp

diff --git a/lib/Target/ARM/ARMSubtarget.cpp b/lib/Target/ARM/ARMSubtarget.cpp
index 31b65f2bfec4db593fa687bae0dcfa8d668c4aee..3180480986d64c53532e27e5a52411ebf40f88de 100644 (file)
--- a/lib/Target/ARM/ARMSubtarget.cpp
+++ b/lib/Target/ARM/ARMSubtarget.cpp
@@ -319,8 +319,19 @@ bool ARMSubtarget::hasSinCos() const {
   return getTargetTriple().isiOS() && !getTargetTriple().isOSVersionLT(7, 0);
 }
 
+bool ARMSubtarget::enableMachineScheduler() const {
+  // Enable the MachineScheduler before register allocation for out-of-order
+  // architectures where we do not use the PostRA scheduler anymore (for now
+  // restricted to swift).
+  return getSchedModel().isOutOfOrder() && isSwift();
+}
+
 // This overrides the PostRAScheduler bit in the SchedModel for any CPU.
 bool ARMSubtarget::enablePostRAScheduler() const {
+  // No need for PostRA scheduling on out of order CPUs (for now restricted to
+  // swift).
+  if (getSchedModel().isOutOfOrder() && isSwift())
+    return false;
   return (!isThumb() || hasThumb2());
 }