First part of refactoring ARM addrmode2 (load/store) instructions to be more

explicit about the operands. Split out the different variants into separate
instructions. This gives us the ability to, among other things, assign
different scheduling itineraries to the variants. rdar://8477752.

llvm-svn: 117409

1 files changed, 23 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/ARMMCCodeEmitter.cpp b/llvm/lib/Target/ARM/ARMMCCodeEmitter.cpp
index f0680e82508..13a80bdffde 100644
--- a/llvm/lib/Target/ARM/ARMMCCodeEmitter.cpp
+++ b/llvm/lib/Target/ARM/ARMMCCodeEmitter.cpp
@@ -49,6 +49,10 @@ public:
   /// operand requires relocation, record the relocation and return zero.
   unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO) const;
 
+  /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
+  /// operand.
+  unsigned getAddrModeImm12OpValue(const MCInst &MI, unsigned Op) const;
+
   /// getCCOutOpValue - Return encoding of the 's' bit.
   unsigned getCCOutOpValue(const MCInst &MI, unsigned Op) const {
     // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
@@ -171,6 +175,25 @@ unsigned ARMMCCodeEmitter::getMachineOpValue(const MCInst &MI,
   return 0;
 }
 
+/// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
+/// operand.
+unsigned ARMMCCodeEmitter::getAddrModeImm12OpValue(const MCInst &MI,
+                                                   unsigned OpIdx) const {
+  // {17-13} = reg
+  // {12}    = (U)nsigned (add == '1', sub == '0')
+  // {11-0}  = imm12
+  const MCOperand &MO  = MI.getOperand(OpIdx);
+  const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
+  unsigned Reg = getARMRegisterNumbering(MO.getReg());
+  int32_t Imm12 = MO1.getImm();
+  uint32_t Binary;
+  Binary = Imm12 & 0xfff;
+  if (Imm12 >= 0)
+    Binary |= (1 << 12);
+  Binary |= (Reg << 13);
+  return Binary;
+}
+
 unsigned ARMMCCodeEmitter::getSORegOpValue(const MCInst &MI,
                                            unsigned OpIdx) const {
   // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg