Index: lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
===================================================================
--- lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
+++ lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
@@ -537,154 +537,74 @@
     return (Val % Scale) == 0 && Val >= 0 && (Val / Scale) < 0x1000;
   }
 
-  bool isImm0_1() const {
+  bool isImmInRange(int N, int M) const {
     if (!isImm())
       return false;
     const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
     if (!MCE)
       return false;
     int64_t Val = MCE->getValue();
-    return (Val >= 0 && Val < 2);
+    return (Val >= N && Val < M);
+  }
+
+  bool isImm0_1() const {
+    return isImmInRange(0, 2);
   }
 
   bool isImm0_7() const {
-    if (!isImm())
-      return false;
-    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
-    if (!MCE)
-      return false;
-    int64_t Val = MCE->getValue();
-    return (Val >= 0 && Val < 8);
+    return isImmInRange(0, 8);
   }
 
   bool isImm1_8() const {
-    if (!isImm())
-      return false;
-    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
-    if (!MCE)
-      return false;
-    int64_t Val = MCE->getValue();
-    return (Val > 0 && Val < 9);
+    return isImmInRange(1, 9);
   }
 
   bool isImm0_15() const {
-    if (!isImm())
-      return false;
-    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
-    if (!MCE)
-      return false;
-    int64_t Val = MCE->getValue();
-    return (Val >= 0 && Val < 16);
+    return isImmInRange(0, 16);
   }
 
   bool isImm1_16() const {
-    if (!isImm())
-      return false;
-    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
-    if (!MCE)
-      return false;
-    int64_t Val = MCE->getValue();
-    return (Val > 0 && Val < 17);
+    return isImmInRange(1, 17);
   }
 
   bool isImm0_31() const {
-    if (!isImm())
-      return false;
-    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
-    if (!MCE)
-      return false;
-    int64_t Val = MCE->getValue();
-    return (Val >= 0 && Val < 32);
+    return isImmInRange(0, 32);
   }
 
   bool isImm1_31() const {
-    if (!isImm())
-      return false;
-    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
-    if (!MCE)
-      return false;
-    int64_t Val = MCE->getValue();
-    return (Val >= 1 && Val < 32);
+    return isImmInRange(1, 32);
   }
 
   bool isImm1_32() const {
-    if (!isImm())
-      return false;
-    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
-    if (!MCE)
-      return false;
-    int64_t Val = MCE->getValue();
-    return (Val >= 1 && Val < 33);
+    return isImmInRange(1, 33);
   }
 
   bool isImm0_63() const {
-    if (!isImm())
-      return false;
-    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
-    if (!MCE)
-      return false;
-    int64_t Val = MCE->getValue();
-    return (Val >= 0 && Val < 64);
+    return isImmInRange(0, 64);
   }
 
   bool isImm1_63() const {
-    if (!isImm())
-      return false;
-    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
-    if (!MCE)
-      return false;
-    int64_t Val = MCE->getValue();
-    return (Val >= 1 && Val < 64);
+    return isImmInRange(1, 64);
   }
 
   bool isImm1_64() const {
-    if (!isImm())
-      return false;
-    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
-    if (!MCE)
-      return false;
-    int64_t Val = MCE->getValue();
-    return (Val >= 1 && Val < 65);
+    return isImmInRange(1, 65);
   }
 
   bool isImm0_127() const {
-    if (!isImm())
-      return false;
-    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
-    if (!MCE)
-      return false;
-    int64_t Val = MCE->getValue();
-    return (Val >= 0 && Val < 128);
+    return isImmInRange(0, 128);
   }
 
   bool isImm0_255() const {
-    if (!isImm())
-      return false;
-    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
-    if (!MCE)
-      return false;
-    int64_t Val = MCE->getValue();
-    return (Val >= 0 && Val < 256);
+    return isImmInRange(0, 256);
   }
 
   bool isImm0_65535() const {
-    if (!isImm())
-      return false;
-    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
-    if (!MCE)
-      return false;
-    int64_t Val = MCE->getValue();
-    return (Val >= 0 && Val < 65536);
+    return isImmInRange(0, 65536);
   }
 
   bool isImm32_63() const {
-    if (!isImm())
-      return false;
-    const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(getImm());
-    if (!MCE)
-      return false;
-    int64_t Val = MCE->getValue();
-    return (Val >= 32 && Val < 64);
+    return isImmInRange(32, 64);
   }
 
   bool isLogicalImm32() const {