Add Thumb HVC and ERET virtualisation extension instructions.

Patch by Matthew Wahab.

Change-Id: I131f71c1150d5fa797066a18e09d526c19bf9016
llvm-svn: 222990

1 files changed, 15 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp b/llvm/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
index a51680c20da..03e4e0a5e17 100644
--- a/llvm/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
+++ b/llvm/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
@@ -292,6 +292,21 @@ void ARMInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
     }
     break;
   }
+    // B9.3.3 ERET (Thumb)
+    // For a target that has Virtualization Extensions, ERET is the preferred
+    // disassembly of SUBS PC, LR, #0
+  case ARM::t2SUBS_PC_LR: {
+    if (MI->getNumOperands() == 3 &&
+        MI->getOperand(0).isImm() &&
+        MI->getOperand(0).getImm() == 0 &&
+        (getAvailableFeatures() & ARM::FeatureVirtualization)) {
+      O << "\teret";
+      printPredicateOperand(MI, 1, O);
+      printAnnotation(O, Annot);
+      return;
+    }
+    break;
+  }
   }
 
   printInstruction(MI, O);