diff --git a/llvm/lib/Target/M68k/M68kInstrBits.td b/llvm/lib/Target/M68k/M68kInstrBits.td
--- a/llvm/lib/Target/M68k/M68kInstrBits.td
+++ b/llvm/lib/Target/M68k/M68kInstrBits.td
@@ -79,6 +79,10 @@
 // Memory BTST limited to 8 bits only
 def BTST8jd : MxBTST_MR<MxType8d, MxType8.JOp, MxType8.JPat,
                         MxEncEAj_0, MxExtEmpty>;
+def BTST8od : MxBTST_MR<MxType8d, MxType8.OOp, MxType8.OPat,
+                        MxEncEAo_0, MxExtEmpty>;
+def BTST8ed : MxBTST_MR<MxType8d, MxType8.EOp, MxType8.EPat,
+                        MxEncEAe_0, MxExtEmpty>;
 def BTST8pd : MxBTST_MR<MxType8d, MxType8.POp, MxType8.PPat,
                         MxEncEAp_0, MxExtI16_0>;
 def BTST8fd : MxBTST_MR<MxType8d, MxType8.FOp, MxType8.FPat,
@@ -90,6 +94,10 @@
 
 def BTST8ji : MxBTST_MI<MxType8d, MxType8.JOp, MxType8.JPat,
                         MxEncEAj_0, MxExtEmpty>;
+def BTST8oi : MxBTST_MI<MxType8d, MxType8.OOp, MxType8.OPat,
+                        MxEncEAo_0, MxExtEmpty>;
+def BTST8ei : MxBTST_MI<MxType8d, MxType8.EOp, MxType8.EPat,
+                        MxEncEAe_0, MxExtEmpty>;
 def BTST8pi : MxBTST_MI<MxType8d, MxType8.POp, MxType8.PPat,
                         MxEncEAp_0, MxExtI16_0>;
 def BTST8fi : MxBTST_MI<MxType8d, MxType8.FOp, MxType8.FPat,
diff --git a/llvm/test/MC/M68k/Bits/Classes/MxBTST_MI.s b/llvm/test/MC/M68k/Bits/Classes/MxBTST_MI.s
--- a/llvm/test/MC/M68k/Bits/Classes/MxBTST_MI.s
+++ b/llvm/test/MC/M68k/Bits/Classes/MxBTST_MI.s
@@ -7,6 +7,20 @@
 ; CHECK-SAME: encoding: [0x08,0x10,0x00,0xff]
 btst	#-1, (%a0)
 
+; CHECK:      btst  #0, (%a1)+
+; CHECK-SAME: encoding: [0x08,0x19,0x00,0x00]
+btst	#0, (%a1)+
+; CHECK:      btst  #-1, (%a0)+
+; CHECK-SAME: encoding: [0x08,0x18,0x00,0xff]
+btst	#-1, (%a0)+
+
+; CHECK:      btst  #0, -(%a1)
+; CHECK-SAME: encoding: [0x08,0x21,0x00,0x00]
+btst	#0, -(%a1)
+; CHECK:      btst  #-1, -(%a0)
+; CHECK-SAME: encoding: [0x08,0x20,0x00,0xff]
+btst	#-1, -(%a0)
+
 ; CHECK:      btst  #0, (-1,%a1)
 ; CHECK-SAME: encoding: [0x08,0x29,0x00,0x00,0xff,0xff]
 btst	#0, (-1,%a1)
diff --git a/llvm/test/MC/M68k/Bits/Classes/MxBTST_MR.s b/llvm/test/MC/M68k/Bits/Classes/MxBTST_MR.s
--- a/llvm/test/MC/M68k/Bits/Classes/MxBTST_MR.s
+++ b/llvm/test/MC/M68k/Bits/Classes/MxBTST_MR.s
@@ -7,6 +7,20 @@
 ; CHECK-SAME: encoding: [0x03,0x10]
 btst	%d1, (%a0)
 
+; CHECK:      btst  %d0, (%a1)+
+; CHECK-SAME: encoding: [0x01,0x19]
+btst	%d0, (%a1)+
+; CHECK:      btst  %d1, (%a0)+
+; CHECK-SAME: encoding: [0x03,0x18]
+btst	%d1, (%a0)+
+
+; CHECK:      btst  %d0, -(%a1)
+; CHECK-SAME: encoding: [0x01,0x21]
+btst	%d0, -(%a1)
+; CHECK:      btst  %d1, -(%a0)
+; CHECK-SAME: encoding: [0x03,0x20]
+btst	%d1, -(%a0)
+
 ; CHECK:      btst  %d0, (-1,%a1)
 ; CHECK-SAME: encoding: [0x01,0x29,0xff,0xff]
 btst	%d0, (-1,%a1)