Support the "target" encodings for the CB[N]Z instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121308 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMAsmBackend.cpp

@@ -145,6 +145,11 @@ static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
     // 'off by 4' is implicitly handled by the half-word ordering of the
     // Thumb encoding, so we only need to adjust by 2 here.
     return ((Value - 2) >> 2) & 0xff;
+  case ARM::fixup_arm_thumb_br: {
+    // Offset by 4 and don't encode the lower bit, which is always 0.
+    uint32_t Binary = (Value - 4) >> 1;
+    return ((Binary & 0x20) << 9) | ((Binary & 0x1f) << 3);
+  }
   case ARM::fixup_arm_pcrel_10:
     Value = Value - 6; // ARM fixups offset by an additional word and don't
                        // need to adjust for the half-word ordering.
@@ -258,6 +263,9 @@ static unsigned getFixupKindNumBytes(unsigned Kind) {
   case ARM::fixup_arm_thumb_cp:
     return 1;
 
+  case ARM::fixup_arm_thumb_br:
+    return 2;
+
   case ARM::fixup_arm_ldst_pcrel_12:
   case ARM::fixup_arm_pcrel_10:
   case ARM::fixup_arm_adr_pcrel_12: