Add support to match @llvm.prefetch to pld / pldw / pli. rdar://8601536.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118152 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 6503960de9..b816e66f7d 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -598,6 +598,11 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
   setOperationAction(ISD::ATOMIC_LOAD_XOR,  MVT::i64, Expand);
   setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i64, Expand);
 
+  // ARM v5TE+ and Thumb2 has preload instructions.
+  if (Subtarget->isThumb2() ||
+      (!Subtarget->isThumb1Only() && Subtarget->hasV5TEOps()))
+    setOperationAction(ISD::PREFETCH,   MVT::Other, Legal);
+
   // Requires SXTB/SXTH, available on v6 and up in both ARM and Thumb modes.
   if (!Subtarget->hasV6Ops()) {
     setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);