[llvm] r270418 - [Sparc] LEON erratum fix - Delay Slot Filler modification.

[Chris Dewhurst via llvm-commits]

Author: lerochris
Date: Mon May 23 06:52:28 2016
New Revision: 270418

URL: http://llvm.org/viewvc/llvm-project?rev=270418&view=rev
Log:
[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.

Modified:
    llvm/trunk/lib/Target/Sparc/DelaySlotFiller.cpp

Modified: llvm/trunk/lib/Target/Sparc/DelaySlotFiller.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Sparc/DelaySlotFiller.cpp?rev=270418&r1=270417&r2=270418&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Sparc/DelaySlotFiller.cpp (original)
+++ llvm/trunk/lib/Target/Sparc/DelaySlotFiller.cpp Mon May 23 06:52:28 2016
@@ -273,6 +273,15 @@ bool Filler::delayHasHazard(MachineBasic
         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;
 }