ARM NEON VST2 assembly parsing and encoding.

Work in progress. Parsing for non-writeback, single spaced register lists
works now. The rest have the representations better factored, but still
need more to be able to parse properly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146579 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 12 insertions, 0 deletions

diff --git a/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp b/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
index 827883dd49..662097aee4 100644
--- a/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
+++ b/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
@@ -1045,3 +1045,13 @@ void ARMInstPrinter::printVectorListTwoAllLanes(const MCInst *MI,
   O << "{" << getRegisterName(MI->getOperand(OpNum).getReg()) << "[], "
     << getRegisterName(MI->getOperand(OpNum).getReg() + 1) << "[]}";
 }
+
+void ARMInstPrinter::printVectorListTwoSpaced(const MCInst *MI, unsigned OpNum,
+                                              raw_ostream &O) {
+  // Normally, it's not safe to use register enum values directly with
+  // addition to get the next register, but for VFP registers, the
+  // sort order is guaranteed because they're all of the form D<n>.
+  O << "{" << getRegisterName(MI->getOperand(OpNum).getReg()) << ", "
+    << getRegisterName(MI->getOperand(OpNum).getReg() + 2) << "}";
+}
+
diff --git a/lib/Target/ARM/InstPrinter/ARMInstPrinter.h b/lib/Target/ARM/InstPrinter/ARMInstPrinter.h
index b1fe9a142f..05db2d2542 100644
--- a/lib/Target/ARM/InstPrinter/ARMInstPrinter.h
+++ b/lib/Target/ARM/InstPrinter/ARMInstPrinter.h
@@ -137,6 +137,8 @@ public:
                                   raw_ostream &O);
   void printVectorListTwoAllLanes(const MCInst *MI, unsigned OpNum,
                                   raw_ostream &O);
+  void printVectorListTwoSpaced(const MCInst *MI, unsigned OpNum,
+                                raw_ostream &O);
 };
 
 } // end namespace llvm