[AArch64] Only run macro fusion for CPUs with any fusion support.

Reviewers: evandro, t.p.northover, javed.absar

Reviewed By: evandro

Subscribers: aemerson, rengolin, kristof.beyls, llvm-commits

Differential Revision: https://reviews.llvm.org/D34959

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307851 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/AArch64/AArch64TargetMachine.cpp b/lib/Target/AArch64/AArch64TargetMachine.cpp
index 25bcc79b3493ca97f173cce3880033cdc1d443f8..6237b8f3e7b9bdf06f493e7f9d81da048703bd5a 100644 (file)
--- a/lib/Target/AArch64/AArch64TargetMachine.cpp
+++ b/lib/Target/AArch64/AArch64TargetMachine.cpp
@@ -277,10 +277,12 @@ public:
 
   ScheduleDAGInstrs *
   createMachineScheduler(MachineSchedContext *C) const override {
+    const AArch64Subtarget &ST = C->MF->getSubtarget<AArch64Subtarget>();
     ScheduleDAGMILive *DAG = createGenericSchedLive(C);
     DAG->addMutation(createLoadClusterDAGMutation(DAG->TII, DAG->TRI));
     DAG->addMutation(createStoreClusterDAGMutation(DAG->TII, DAG->TRI));
-    DAG->addMutation(createAArch64MacroFusionDAGMutation());
+    if (ST.hasFusion())
+      DAG->addMutation(createAArch64MacroFusionDAGMutation());
     return DAG;
   }