Fill out support for Thumb2 encodings of NEON instructions.

llvm-svn: 118854

3 files changed, 21 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/ARMCodeEmitter.cpp b/llvm/lib/Target/ARM/ARMCodeEmitter.cpp
index cd4ac6a6c19..b068c64f63e 100644
--- a/llvm/lib/Target/ARM/ARMCodeEmitter.cpp
+++ b/llvm/lib/Target/ARM/ARMCodeEmitter.cpp
@@ -165,6 +165,8 @@ namespace {
       const { return 0; }
     unsigned NEONThumb2LoadStorePostEncoder(const MachineInstr &MI,unsigned Val) 
       const { return 0; }
+    unsigned NEONThumb2DupPostEncoder(const MachineInstr &MI,unsigned Val) 
+      const { return 0; }
     unsigned getBranchTargetOpValue(const MachineInstr &MI, unsigned Op)
       const { return 0; }
     unsigned getCCOutOpValue(const MachineInstr &MI, unsigned Op)
diff --git a/llvm/lib/Target/ARM/ARMInstrFormats.td b/llvm/lib/Target/ARM/ARMInstrFormats.td
index 56aa4b0e0d8..251e5c27a0b 100644
--- a/llvm/lib/Target/ARM/ARMInstrFormats.td
+++ b/llvm/lib/Target/ARM/ARMInstrFormats.td
@@ -2046,6 +2046,8 @@ class NVLaneOp<bits<8> opcod1, bits<4> opcod2, bits<2> opcod3,
   let Pattern = pattern;
   list<Predicate> Predicates = [HasNEON];
   
+  string PostEncoderMethod = "NEONThumb2DupPostEncoder";
+  
   bits<5> V;
   bits<4> R;
   bits<4> p;
diff --git a/llvm/lib/Target/ARM/ARMMCCodeEmitter.cpp b/llvm/lib/Target/ARM/ARMMCCodeEmitter.cpp
index a407acad4d4..ebd0d9b5599 100644
--- a/llvm/lib/Target/ARM/ARMMCCodeEmitter.cpp
+++ b/llvm/lib/Target/ARM/ARMMCCodeEmitter.cpp
@@ -176,6 +176,8 @@ public:
                                       unsigned EncodedValue) const;
   unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
                                       unsigned EncodedValue) const;
+  unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
+                                      unsigned EncodedValue) const;
 
   void EmitByte(unsigned char C, raw_ostream &OS) const {
     OS << (char)C;
@@ -234,6 +236,21 @@ unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
   return EncodedValue;
 }
 
+/// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
+/// instructions, and rewrite them to their Thumb2 form if we are currently in 
+/// Thumb2 mode.
+unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
+                                                 unsigned EncodedValue) const {
+  const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
+  if (Subtarget.isThumb2()) {
+    EncodedValue &= 0x00FFFFFF;
+    EncodedValue |= 0xEE000000;
+  }
+  
+  return EncodedValue;
+}
+
+
 
 /// getMachineOpValue - Return binary encoding of operand. If the machine
 /// operand requires relocation, record the relocation and return zero.