diff --git a/llvm/lib/Target/PowerPC/PPCInstr64Bit.td b/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
--- a/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
+++ b/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
@@ -843,7 +843,7 @@
   def SETB8 : XForm_44<31, 128, (outs g8rc:$RT), (ins crrc:$BFA),
                        "setb $RT, $BFA", IIC_IntGeneral>, isPPC64;
 }
-def DARN : XForm_45<31, 755, (outs g8rc:$RT), (ins i32imm:$L),
+def DARN : XForm_45<31, 755, (outs g8rc:$RT), (ins u2imm:$L),
                      "darn $RT, $L", IIC_LdStLD>, isPPC64;
 def ADDPCIS : DXForm<19, 2, (outs g8rc:$RT), (ins i32imm:$D),
                      "addpcis $RT, $D", IIC_BrB, []>, isPPC64;
diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.td b/llvm/lib/Target/PowerPC/PPCInstrInfo.td
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.td
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.td
@@ -1897,7 +1897,7 @@
                       IIC_LdStDCBF, [(int_ppc_dcbzl xoaddr:$dst)]>,
                       PPC970_DGroup_Single;
 
-def DCBF   : DCB_Form_hint<86, (outs), (ins u5imm:$TH, memrr:$dst),
+def DCBF   : DCB_Form_hint<86, (outs), (ins u3imm:$TH, memrr:$dst),
                       "dcbf $dst, $TH", IIC_LdStDCBF, []>,
                       PPC970_DGroup_Single;
 
@@ -2432,7 +2432,7 @@
 def STMW : DForm_1<47, (outs), (ins gprc:$rS, memri:$dst),
                    "stmw $rS, $dst", IIC_LdStLMW, []>;
 
-def SYNC : XForm_24_sync<31, 598, (outs), (ins i32imm:$L),
+def SYNC : XForm_24_sync<31, 598, (outs), (ins u3imm:$L),
                         "sync $L", IIC_LdStSync, []>;
 
 let isCodeGenOnly = 1 in {
@@ -4275,7 +4275,7 @@
 def ICBI : XForm_1a<31, 982, (outs), (ins memrr:$src),
                     "icbi $src", IIC_LdStICBI, []>;
 
-def WAIT : XForm_24_sync<31, 30, (outs), (ins i32imm:$L),
+def WAIT : XForm_24_sync<31, 30, (outs), (ins u2imm:$L),
                          "wait $L", IIC_LdStLoad, []>;
 
 def MBAR : XForm_mbar<31, 854, (outs), (ins u5imm:$MO),
@@ -4293,7 +4293,7 @@
 def MFSRIN: XForm_srin<31, 659, (outs gprc:$RS), (ins gprc:$RB),
             "mfsrin $RS, $RB", IIC_SprMFSR>;
 
-def MTMSR: XForm_mtmsr<31, 146, (outs), (ins gprc:$RS, i32imm:$L),
+def MTMSR: XForm_mtmsr<31, 146, (outs), (ins gprc:$RS, u1imm:$L),
                     "mtmsr $RS, $L", IIC_SprMTMSR>;
 
 def WRTEE: XForm_mtmsr<31, 131, (outs), (ins gprc:$RS),
@@ -4322,7 +4322,7 @@
 def MFMSR : XForm_rs<31, 83, (outs gprc:$RT), (ins),
                   "mfmsr $RT", IIC_SprMFMSR, []>;
 
-def MTMSRD : XForm_mtmsr<31, 178, (outs), (ins gprc:$RS, i32imm:$L),
+def MTMSRD : XForm_mtmsr<31, 178, (outs), (ins gprc:$RS, u1imm:$L),
                     "mtmsrd $RS, $L", IIC_SprMTMSRD>;
 
 def MCRFS : XLForm_3<63, 64, (outs crrc:$BF), (ins crrc:$BFA),
@@ -4342,11 +4342,11 @@
 let Predicates = [HasFPU] in {
 let Defs = [RM] in {
 def MTFSF : XFLForm_1<63, 711, (outs),
-                      (ins i32imm:$FLM, f8rc:$FRB, i32imm:$L, i32imm:$W),
+                      (ins i32imm:$FLM, f8rc:$FRB, u1imm:$L, i32imm:$W),
                       "mtfsf $FLM, $FRB, $L, $W", IIC_IntMFFS, []>;
 let Defs = [CR1] in
 def MTFSF_rec : XFLForm_1<63, 711, (outs),
-                       (ins i32imm:$FLM, f8rc:$FRB, i32imm:$L, i32imm:$W),
+                       (ins i32imm:$FLM, f8rc:$FRB, u1imm:$L, i32imm:$W),
                        "mtfsf. $FLM, $FRB, $L, $W", IIC_IntMFFS, []>, isRecordForm;
 }
 
diff --git a/llvm/test/MC/PowerPC/ppc64-errors.s b/llvm/test/MC/PowerPC/ppc64-errors.s
--- a/llvm/test/MC/PowerPC/ppc64-errors.s
+++ b/llvm/test/MC/PowerPC/ppc64-errors.s
@@ -24,6 +24,44 @@
 # CHECK-NEXT: subf 3, 4, symbol@tls
               subf 3, 4, symbol@tls
 
+# Unsigned 1-bit immediate operands
+
+# CHECK: error: invalid operand for instruction
+# CHECK-NEXT: mtmsr 1, 9
+              mtmsr 1, 9
+
+# CHECK: error: invalid operand for instruction
+# CHECK-NEXT: mtmsrd 1, 9
+              mtmsrd 1, 9
+
+# CHECK: error: invalid operand for instruction
+# CHECK-NEXT: mtfsf 1, 2, 9, 1
+              mtfsf 1, 2, 9, 1
+
+# CHECK: error: invalid operand for instruction
+# CHECK-NEXT: mtfsf. 1, 2, 9, 1
+              mtfsf. 1, 2, 9, 1
+
+# Unsigned 2-bit immediate operands
+
+# CHECK: error: invalid operand for instruction
+# CHECK-NEXT: darn 1, 9
+              darn 1, 9
+    
+# CHECK: error: invalid operand for instruction
+# CHECK-NEXT: wait 9
+              wait 9
+
+# Unsigned 3-bit immediate operands
+
+# CHECK: error: invalid operand for instruction
+# CHECK-NEXT: dcbf 0, 1, 9
+              dcbf 0, 1, 9
+
+# CHECK: error: invalid operand for instruction
+# CHECK-NEXT: sync 9
+              sync 9
+
 # Signed 16-bit immediate operands
 
 # CHECK: error: invalid operand for instruction