Index: llvm/trunk/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
===================================================================
--- llvm/trunk/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
+++ llvm/trunk/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
@@ -260,18 +260,37 @@
       return false;
 
     int64_t Imm = Inst.getOperand(0).getImm();
-    // FIXME: This is not right for thumb.
     Target = Addr+Imm+8; // In ARM mode the PC is always off by 8 bytes.
     return true;
   }
 };
 
+class ThumbMCInstrAnalysis : public ARMMCInstrAnalysis {
+public:
+  ThumbMCInstrAnalysis(const MCInstrInfo *Info) : ARMMCInstrAnalysis(Info) {}
+
+  bool evaluateBranch(const MCInst &Inst, uint64_t Addr,
+                      uint64_t Size, uint64_t &Target) const override {
+    // We only handle PCRel branches for now.
+    if (Info->get(Inst.getOpcode()).OpInfo[0].OperandType!=MCOI::OPERAND_PCREL)
+      return false;
+
+    int64_t Imm = Inst.getOperand(0).getImm();
+    Target = Addr+Imm+4; // In Thumb mode the PC is always off by 4 bytes.
+    return true;
+  }
+};
+
 }
 
 static MCInstrAnalysis *createARMMCInstrAnalysis(const MCInstrInfo *Info) {
   return new ARMMCInstrAnalysis(Info);
 }
 
+static MCInstrAnalysis *createThumbMCInstrAnalysis(const MCInstrInfo *Info) {
+  return new ThumbMCInstrAnalysis(Info);
+}
+
 // Force static initialization.
 extern "C" void LLVMInitializeARMTargetMC() {
   for (Target *T : {&getTheARMLETarget(), &getTheARMBETarget(),
@@ -289,9 +308,6 @@
     TargetRegistry::RegisterMCSubtargetInfo(*T,
                                             ARM_MC::createARMMCSubtargetInfo);
 
-    // Register the MC instruction analyzer.
-    TargetRegistry::RegisterMCInstrAnalysis(*T, createARMMCInstrAnalysis);
-
     TargetRegistry::RegisterELFStreamer(*T, createELFStreamer);
     TargetRegistry::RegisterCOFFStreamer(*T, createARMWinCOFFStreamer);
     TargetRegistry::RegisterMachOStreamer(*T, createARMMachOStreamer);
@@ -313,6 +329,12 @@
     TargetRegistry::RegisterMCRelocationInfo(*T, createARMMCRelocationInfo);
   }
 
+  // Register the MC instruction analyzer.
+  for (Target *T : {&getTheARMLETarget(), &getTheARMBETarget()})
+    TargetRegistry::RegisterMCInstrAnalysis(*T, createARMMCInstrAnalysis);
+  for (Target *T : {&getTheThumbLETarget(), &getTheThumbBETarget()})
+    TargetRegistry::RegisterMCInstrAnalysis(*T, createThumbMCInstrAnalysis);
+
   // Register the MC Code Emitter
   for (Target *T : {&getTheARMLETarget(), &getTheThumbLETarget()})
     TargetRegistry::RegisterMCCodeEmitter(*T, createARMLEMCCodeEmitter);
Index: llvm/trunk/test/MC/ARM/branch-disassemble.s
===================================================================
--- llvm/trunk/test/MC/ARM/branch-disassemble.s
+++ llvm/trunk/test/MC/ARM/branch-disassemble.s
@@ -0,0 +1,15 @@
+@ RUN: llvm-mc -mcpu=cortex-a9 -triple armv7-arm-none-eabi -filetype obj -o - %s \
+@ RUN:   | llvm-objdump -mcpu=cortex-a9 -triple armv7-arm-none-eabi -d - \
+@ RUN:   | FileCheck %s -check-prefix CHECK-ARM
+
+@ RUN: llvm-mc -mcpu=cortex-m3 -triple thumbv7m-arm-none-eabi -filetype obj -o - %s \
+@ RUN:   | llvm-objdump -mcpu=cortex-m3 -triple thumbv7m-arm-none-eabi -d - \
+@ RUN:   | FileCheck %s -check-prefix CHECK-THUMB
+
+b.w .Lbranch
+@ CHECK-ARM: b #4 <$a.0+0xC>
+@ CHECK-THUMB: b.w #8 <$t.0+0xC>
+adds r0, r1, #42
+adds r1, r2, #42
+.Lbranch:
+movs r2, r3
Index: llvm/trunk/test/MC/ARM/coff-relocations.s
===================================================================
--- llvm/trunk/test/MC/ARM/coff-relocations.s
+++ llvm/trunk/test/MC/ARM/coff-relocations.s
@@ -14,21 +14,21 @@
 branch24t:
 	b target
 
-@ CHECK-ENCODING-LABEL: branch24t
+@ CHECK-ENCODING-LABEL: branch24t:
 @ CHECK-ENCODING-NEXT: b.w #0
 
 	.thumb_func
 branch20t:
 	bcc target
 
-@ CHECK-ENCODING-LABEL: branch20t
+@ CHECK-ENCODING-LABEL: branch20t:
 @ CHECK-ENCODING-NEXT: blo.w #0
 
 	.thumb_func
 blx23t:
 	bl target
 
-@ CHECK-ENCODING-LABEL: blx23t
+@ CHECK-ENCODING-LABEL: blx23t:
 @ CHECK-ENCODING-NEXT: bl #0
 
 	.thumb_func
@@ -37,7 +37,7 @@
 	movt r0, :upper16:target
 	blx r0
 
-@ CHECK-ENCODING-LABEL: mov32t
+@ CHECK-ENCODING-LABEL: mov32t:
 @ CHECK-ENCODING-NEXT: movw r0, #0
 @ CHECK-ENCODING-NEXT: movt r0, #0
 @ CHECK-ENCODING-NEXT: blx r0
@@ -50,7 +50,7 @@
 .Laddr32:
 	.long target
 
-@ CHECK-ENCODING-LABEL: addr32
+@ CHECK-ENCODING-LABEL: addr32:
 @ CHECK-ENCODING-NEXT: ldr r0, [pc, #4]
 @ CHECK-ENCODING-NEXT: bx r0
 @ CHECK-ENCODING-NEXT: trap
@@ -65,7 +65,7 @@
 .Laddr32nb:
 	.long target(imgrel)
 
-@ CHECK-ENCODING-LABEL: addr32nb
+@ CHECK-ENCODING-LABEL: addr32nb:
 @ CHECK-ENCODING-NEXT: ldr.w r0, [pc, #4]
 @ CHECK-ENCODING-NEXT: bx r0
 @ CHECK-ENCODING-NEXT: trap
@@ -80,7 +80,7 @@
 .Lsecrel:
 	.long target(secrel32)
 
-@ CHECK-ENCODING-LABEL: secrel
+@ CHECK-ENCODING-LABEL: secrel:
 @ CHECK-ENCODING-NEXT: ldr.w r0, [pc, #4]
 @ CHECK-ENCODING-NEXT: bx r0
 @ CHECK-ENCODING-NEXT: trap