[Sparc] LEON erratum fix - Delay Slot Filler modification.

This code should have been with the previous check-in (r270417) and prevents the DelaySlotFiller pass being utilized in functions where the erratum fix has been applied as this will break the run-time code.

llvm-svn: 270418

1 files changed, 9 insertions, 0 deletions

diff --git a/llvm/lib/Target/Sparc/DelaySlotFiller.cpp b/llvm/lib/Target/Sparc/DelaySlotFiller.cpp
index 48c15cab376..442e7263e39 100644
--- a/llvm/lib/Target/Sparc/DelaySlotFiller.cpp
+++ b/llvm/lib/Target/Sparc/DelaySlotFiller.cpp
@@ -273,6 +273,15 @@ bool Filler::delayHasHazard(MachineBasicBlock::iterator candidate,
         return true;
     }
   }
+
+  unsigned Opcode = candidate->getOpcode();
+  // LD and LDD may have NOPs inserted afterwards in the case of some LEON
+  // processors, so we can't use the delay slot if this feature is switched-on.
+  if (Subtarget->insertNOPLoad()
+      &&
+      Opcode >=  SP::LDDArr && Opcode <= SP::LDrr)
+    return true;
+
   return false;
 }