From 0f4b60d43a289671082deee3bd56a3a055afb16a Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Fri, 10 Dec 2010 22:11:13 +0000
Subject: [PATCH] Fix encoding of Thumb1 LDRB and STRB.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121581 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMCodeEmitter.cpp   |  2 ++
 lib/Target/ARM/ARMInstrThumb.td     |  1 +
 lib/Target/ARM/ARMMCCodeEmitter.cpp | 15 +++++++++++++++
 3 files changed, 18 insertions(+)

diff --git a/lib/Target/ARM/ARMCodeEmitter.cpp b/lib/Target/ARM/ARMCodeEmitter.cpp
index dc9f52488cf..823947395f2 100644
--- a/lib/Target/ARM/ARMCodeEmitter.cpp
+++ b/lib/Target/ARM/ARMCodeEmitter.cpp
@@ -191,6 +191,8 @@ namespace {
       const { return 0; }
     unsigned getSORegOpValue(const MachineInstr &MI, unsigned Op)
       const { return 0; }
+    unsigned getTAddrModeRegRegOpValue(const MachineInstr &MI, unsigned Op)
+      const { return 0; }
     unsigned getT2AddrModeImm12OpValue(const MachineInstr &MI, unsigned Op)
       const { return 0; }
     unsigned getT2AddrModeImm8OpValue(const MachineInstr &MI, unsigned Op)
diff --git a/lib/Target/ARM/ARMInstrThumb.td b/lib/Target/ARM/ARMInstrThumb.td
index e25e9cc9d90..c1192910113 100644
--- a/lib/Target/ARM/ARMInstrThumb.td
+++ b/lib/Target/ARM/ARMInstrThumb.td
@@ -103,6 +103,7 @@ def MemModeThumbAsmOperand : AsmOperandClass {
 //
 def t_addrmode_rr : Operand<i32>,
                     ComplexPattern<i32, 2, "SelectThumbAddrModeRR", []> {
+  let EncoderMethod = "getTAddrModeRegRegOpValue";
   let PrintMethod = "printThumbAddrModeRROperand";
   let MIOperandInfo = (ops tGPR:$base, tGPR:$offsreg);
 }
diff --git a/lib/Target/ARM/ARMMCCodeEmitter.cpp b/lib/Target/ARM/ARMMCCodeEmitter.cpp
index f63d2f3be1e..e4f3288c82d 100644
--- a/lib/Target/ARM/ARMMCCodeEmitter.cpp
+++ b/lib/Target/ARM/ARMMCCodeEmitter.cpp
@@ -129,6 +129,10 @@ public:
   uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
                                    SmallVectorImpl<MCFixup> &Fixups) const;
 
+  /// getTAddrModeRegRegOpValue - Return encoding for 'reg + reg' operand.
+  uint32_t getTAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
+                                     SmallVectorImpl<MCFixup> &Fixups) const;
+
   /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2'
   /// operand.
   uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
@@ -504,6 +508,17 @@ getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
                                   Fixups);
 }
 
+/// getTAddrModeRegRegOpValue - Return encoding info for 'reg + reg' operand.
+uint32_t ARMMCCodeEmitter::
+getTAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
+                        SmallVectorImpl<MCFixup> &Fixups) const {
+  const MCOperand &MO1 = MI.getOperand(OpIdx);
+  const MCOperand &MO2 = MI.getOperand(OpIdx+1);
+  unsigned Rn = getARMRegisterNumbering(MO1.getReg());
+  unsigned Rm = getARMRegisterNumbering(MO2.getReg());
+  return (Rm << 3) | Rn;
+}
+
 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
 uint32_t ARMMCCodeEmitter::
 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
-- 
2.34.1