From 583a2a06152de7796967488f3689e109ba6c5364 Mon Sep 17 00:00:00 2001
From: Bob Wilson <bob.wilson@apple.com>
Date: Fri, 25 Jun 2010 21:17:19 +0000
Subject: [PATCH] Add support for encoding 2-register NEON instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106891 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMCodeEmitter.cpp | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/lib/Target/ARM/ARMCodeEmitter.cpp b/lib/Target/ARM/ARMCodeEmitter.cpp
index 8281d68bce4..0269afa3d4d 100644
--- a/lib/Target/ARM/ARMCodeEmitter.cpp
+++ b/lib/Target/ARM/ARMCodeEmitter.cpp
@@ -139,7 +139,8 @@ namespace {
 
     void emitMiscInstruction(const MachineInstr &MI);
 
-    void emitNEON1RegModImm(const MachineInstr &MI);
+    void emitNEON1RegModImmInstruction(const MachineInstr &MI);
+    void emitNEON2RegInstruction(const MachineInstr &MI);
 
     /// getMachineOpValue - Return binary encoding of operand. If the machine
     /// operand requires relocation, record the relocation and return zero.
@@ -412,7 +413,10 @@ void ARMCodeEmitter::emitInstruction(const MachineInstr &MI) {
     break;
   // NEON instructions.
   case ARMII::N1RegModImmFrm:
-    emitNEON1RegModImm(MI);
+    emitNEON1RegModImmInstruction(MI);
+    break;
+  case ARMII::N2RegFrm:
+    emitNEON2RegInstruction(MI);
     break;
   }
   MCE.processDebugLoc(MI.getDebugLoc(), false);
@@ -1555,7 +1559,16 @@ static unsigned encodeNEONRd(const MachineInstr &MI, unsigned OpIdx) {
   return Binary;
 }
 
-void ARMCodeEmitter::emitNEON1RegModImm(const MachineInstr &MI) {
+static unsigned encodeNEONRm(const MachineInstr &MI, unsigned OpIdx) {
+  unsigned RegM = MI.getOperand(OpIdx).getReg();
+  unsigned Binary = 0;
+  RegM = ARMRegisterInfo::getRegisterNumbering(RegM);
+  Binary |= (RegM & 0xf);
+  Binary |= ((RegM >> 4) & 1) << ARMII::M_BitShift;
+  return Binary;
+}
+
+void ARMCodeEmitter::emitNEON1RegModImmInstruction(const MachineInstr &MI) {
   unsigned Binary = getBinaryCodeForInstr(MI);
   // Destination register is encoded in Dd.
   Binary |= encodeNEONRd(MI, 0);
@@ -1574,4 +1587,13 @@ void ARMCodeEmitter::emitNEON1RegModImm(const MachineInstr &MI) {
   emitWordLE(Binary);
 }
 
+void ARMCodeEmitter::emitNEON2RegInstruction(const MachineInstr &MI) {
+  unsigned Binary = getBinaryCodeForInstr(MI);
+  // Destination register is encoded in Dd.
+  Binary |= encodeNEONRd(MI, 0);
+  Binary |= encodeNEONRm(MI, 1);
+  // FIXME: This does not handle VDUPfdf or VDUPfqf.
+  emitWordLE(Binary);
+}
+
 #include "ARMGenCodeEmitter.inc"