diff --git a/compiler/dex/dex_to_dex_compiler.cc b/compiler/dex/dex_to_dex_compiler.cc
index f7968c2..7e916be 100644
--- a/compiler/dex/dex_to_dex_compiler.cc
+++ b/compiler/dex/dex_to_dex_compiler.cc
@@ -238,7 +238,7 @@
   bool is_volatile;
   bool fast_path = driver_.ComputeInstanceFieldInfo(field_idx, &unit_, is_put,
                                                     &field_offset, &is_volatile);
-  if (fast_path && !is_volatile && IsUint(16, field_offset.Int32Value())) {
+  if (fast_path && !is_volatile && IsUint<16>(field_offset.Int32Value())) {
     VLOG(compiler) << "Quickening " << Instruction::Name(inst->Opcode())
                    << " to " << Instruction::Name(new_opcode)
                    << " by replacing field index " << field_idx
@@ -274,7 +274,7 @@
                                              &target_method, &vtable_idx,
                                              &direct_code, &direct_method);
   if (fast_path && original_invoke_type == invoke_type) {
-    if (vtable_idx >= 0 && IsUint(16, vtable_idx)) {
+    if (vtable_idx >= 0 && IsUint<16>(vtable_idx)) {
       VLOG(compiler) << "Quickening " << Instruction::Name(inst->Opcode())
                      << "(" << PrettyMethod(method_idx, GetDexFile(), true) << ")"
                      << " to " << Instruction::Name(new_opcode)
diff --git a/compiler/dex/quick/mips/utility_mips.cc b/compiler/dex/quick/mips/utility_mips.cc
index 6f6bf68..ec6edab 100644
--- a/compiler/dex/quick/mips/utility_mips.cc
+++ b/compiler/dex/quick/mips/utility_mips.cc
@@ -56,7 +56,8 @@
 }
 
 bool MipsMir2Lir::InexpensiveConstantInt(int32_t value) {
-  return ((value == 0) || IsUint(16, value) || ((value < 0) && (value >= -32768)));
+  // For encodings, see LoadConstantNoClobber below.
+  return ((value == 0) || IsUint<16>(value) || IsInt<16>(value));
 }
 
 bool MipsMir2Lir::InexpensiveConstantFloat(int32_t value) {
@@ -96,9 +97,11 @@
   /* See if the value can be constructed cheaply */
   if (value == 0) {
     res = NewLIR2(kMipsMove, r_dest.GetReg(), rZERO);
-  } else if ((value > 0) && (value <= 65535)) {
+  } else if (IsUint<16>(value)) {
+    // Use OR with (unsigned) immediate to encode 16b unsigned int.
     res = NewLIR3(kMipsOri, r_dest.GetReg(), rZERO, value);
-  } else if ((value < 0) && (value >= -32768)) {
+  } else if (IsInt<16>(value)) {
+    // Use ADD with (signed) immediate to encode 16b signed int.
     res = NewLIR3(kMipsAddiu, r_dest.GetReg(), rZERO, value);
   } else {
     res = NewLIR2(kMipsLui, r_dest.GetReg(), value >> 16);
diff --git a/compiler/utils/arm/assembler_arm.cc b/compiler/utils/arm/assembler_arm.cc
index 1f44f19..a52e6eb 100644
--- a/compiler/utils/arm/assembler_arm.cc
+++ b/compiler/utils/arm/assembler_arm.cc
@@ -166,7 +166,7 @@
 }
 
 uint32_t Address::encodingArm() const {
-  CHECK(IsAbsoluteUint(12, offset_));
+  CHECK(IsAbsoluteUint<12>(offset_));
   uint32_t encoding;
   if (is_immed_offset_) {
     if (offset_ < 0) {
@@ -278,11 +278,12 @@
 
 // Encoding for vfp load/store addressing.
 uint32_t Address::vencoding() const {
+  CHECK(IsAbsoluteUint<10>(offset_));  // In the range -1020 to +1020.
+  CHECK_ALIGNED(offset_, 2);  // Multiple of 4.
+
   const uint32_t offset_mask = (1 << 12) - 1;
   uint32_t encoding = encodingArm();
   uint32_t offset = encoding & offset_mask;
-  CHECK(IsAbsoluteUint(10, offset));  // In the range -1020 to +1020.
-  CHECK_ALIGNED(offset, 2);  // Multiple of 4.
   CHECK((am_ == Offset) || (am_ == NegOffset));
   uint32_t vencoding_value = (encoding & (0xf << kRnShift)) | (offset >> 2);
   if (am_ == Offset) {
@@ -298,13 +299,13 @@
     case kLoadSignedHalfword:
     case kLoadUnsignedHalfword:
     case kLoadWordPair:
-      return IsAbsoluteUint(8, offset);  // Addressing mode 3.
+      return IsAbsoluteUint<8>(offset);  // Addressing mode 3.
     case kLoadUnsignedByte:
     case kLoadWord:
-      return IsAbsoluteUint(12, offset);  // Addressing mode 2.
+      return IsAbsoluteUint<12>(offset);  // Addressing mode 2.
     case kLoadSWord:
     case kLoadDWord:
-      return IsAbsoluteUint(10, offset);  // VFP addressing mode.
+      return IsAbsoluteUint<10>(offset);  // VFP addressing mode.
     default:
       LOG(FATAL) << "UNREACHABLE";
       UNREACHABLE();
@@ -316,13 +317,13 @@
   switch (type) {
     case kStoreHalfword:
     case kStoreWordPair:
-      return IsAbsoluteUint(8, offset);  // Addressing mode 3.
+      return IsAbsoluteUint<8>(offset);  // Addressing mode 3.
     case kStoreByte:
     case kStoreWord:
-      return IsAbsoluteUint(12, offset);  // Addressing mode 2.
+      return IsAbsoluteUint<12>(offset);  // Addressing mode 2.
     case kStoreSWord:
     case kStoreDWord:
-      return IsAbsoluteUint(10, offset);  // VFP addressing mode.
+      return IsAbsoluteUint<10>(offset);  // VFP addressing mode.
     default:
       LOG(FATAL) << "UNREACHABLE";
       UNREACHABLE();
@@ -336,12 +337,12 @@
     case kLoadUnsignedHalfword:
     case kLoadUnsignedByte:
     case kLoadWord:
-      return IsAbsoluteUint(12, offset);
+      return IsAbsoluteUint<12>(offset);
     case kLoadSWord:
     case kLoadDWord:
-      return IsAbsoluteUint(10, offset);  // VFP addressing mode.
+      return IsAbsoluteUint<10>(offset);  // VFP addressing mode.
     case kLoadWordPair:
-      return IsAbsoluteUint(10, offset);
+      return IsAbsoluteUint<10>(offset);
     default:
       LOG(FATAL) << "UNREACHABLE";
       UNREACHABLE();
@@ -354,12 +355,12 @@
     case kStoreHalfword:
     case kStoreByte:
     case kStoreWord:
-      return IsAbsoluteUint(12, offset);
+      return IsAbsoluteUint<12>(offset);
     case kStoreSWord:
     case kStoreDWord:
-      return IsAbsoluteUint(10, offset);  // VFP addressing mode.
+      return IsAbsoluteUint<10>(offset);  // VFP addressing mode.
     case kStoreWordPair:
-      return IsAbsoluteUint(10, offset);
+      return IsAbsoluteUint<10>(offset);
     default:
       LOG(FATAL) << "UNREACHABLE";
       UNREACHABLE();
diff --git a/compiler/utils/arm/assembler_arm32.cc b/compiler/utils/arm/assembler_arm32.cc
index 8d1fb60..9579691 100644
--- a/compiler/utils/arm/assembler_arm32.cc
+++ b/compiler/utils/arm/assembler_arm32.cc
@@ -1254,7 +1254,7 @@
 
 
 void Arm32Assembler::svc(uint32_t imm24) {
-  CHECK(IsUint(24, imm24)) << imm24;
+  CHECK(IsUint<24>(imm24)) << imm24;
   int32_t encoding = (AL << kConditionShift) | B27 | B26 | B25 | B24 | imm24;
   Emit(encoding);
 }
diff --git a/compiler/utils/arm/assembler_thumb2.cc b/compiler/utils/arm/assembler_thumb2.cc
index 5383c28..6d0571e 100644
--- a/compiler/utils/arm/assembler_thumb2.cc
+++ b/compiler/utils/arm/assembler_thumb2.cc
@@ -2080,7 +2080,7 @@
 
 
 void Thumb2Assembler::svc(uint32_t imm8) {
-  CHECK(IsUint(8, imm8)) << imm8;
+  CHECK(IsUint<8>(imm8)) << imm8;
   int16_t encoding = B15 | B14 | B12 |
        B11 | B10 | B9 | B8 |
        imm8;
@@ -2089,7 +2089,7 @@
 
 
 void Thumb2Assembler::bkpt(uint16_t imm8) {
-  CHECK(IsUint(8, imm8)) << imm8;
+  CHECK(IsUint<8>(imm8)) << imm8;
   int16_t encoding = B15 | B13 | B12 |
       B11 | B10 | B9 |
       imm8;
diff --git a/compiler/utils/x86/assembler_x86.cc b/compiler/utils/x86/assembler_x86.cc
index 03744e4..8f4208b 100644
--- a/compiler/utils/x86/assembler_x86.cc
+++ b/compiler/utils/x86/assembler_x86.cc
@@ -1290,7 +1290,7 @@
     static const int kLongSize = 6;
     int offset = label->Position() - buffer_.Size();
     CHECK_LE(offset, 0);
-    if (IsInt(8, offset - kShortSize)) {
+    if (IsInt<8>(offset - kShortSize)) {
       EmitUint8(0x70 + condition);
       EmitUint8((offset - kShortSize) & 0xFF);
     } else {
@@ -1325,7 +1325,7 @@
     static const int kLongSize = 5;
     int offset = label->Position() - buffer_.Size();
     CHECK_LE(offset, 0);
-    if (IsInt(8, offset - kShortSize)) {
+    if (IsInt<8>(offset - kShortSize)) {
       EmitUint8(0xEB);
       EmitUint8((offset - kShortSize) & 0xFF);
     } else {
diff --git a/compiler/utils/x86/assembler_x86.h b/compiler/utils/x86/assembler_x86.h
index 3a44ace..2dde907 100644
--- a/compiler/utils/x86/assembler_x86.h
+++ b/compiler/utils/x86/assembler_x86.h
@@ -35,10 +35,10 @@
 
   int32_t value() const { return value_; }
 
-  bool is_int8() const { return IsInt(8, value_); }
-  bool is_uint8() const { return IsUint(8, value_); }
-  bool is_int16() const { return IsInt(16, value_); }
-  bool is_uint16() const { return IsUint(16, value_); }
+  bool is_int8() const { return IsInt<8>(value_); }
+  bool is_uint8() const { return IsUint<8>(value_); }
+  bool is_int16() const { return IsInt<16>(value_); }
+  bool is_uint16() const { return IsUint<16>(value_); }
 
  private:
   const int32_t value_;
diff --git a/compiler/utils/x86_64/assembler_x86_64.cc b/compiler/utils/x86_64/assembler_x86_64.cc
index 556fa9b..f2704b7 100644
--- a/compiler/utils/x86_64/assembler_x86_64.cc
+++ b/compiler/utils/x86_64/assembler_x86_64.cc
@@ -1515,7 +1515,7 @@
 
   // See whether imm can be represented as a sign-extended 8bit value.
   int32_t v32 = static_cast<int32_t>(imm.value());
-  if (IsInt32(8, v32)) {
+  if (IsInt<8>(v32)) {
     // Sign-extension works.
     EmitUint8(0x6B);
     EmitOperand(reg.LowBits(), Operand(reg));
@@ -1555,7 +1555,7 @@
 
   // See whether imm can be represented as a sign-extended 8bit value.
   int64_t v64 = imm.value();
-  if (IsInt64(8, v64)) {
+  if (IsInt<8>(v64)) {
     // Sign-extension works.
     EmitUint8(0x6B);
     EmitOperand(reg.LowBits(), Operand(reg));
@@ -1705,7 +1705,7 @@
 void X86_64Assembler::enter(const Immediate& imm) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0xC8);
-  CHECK(imm.is_uint16());
+  CHECK(imm.is_uint16()) << imm.value();
   EmitUint8(imm.value() & 0xFF);
   EmitUint8((imm.value() >> 8) & 0xFF);
   EmitUint8(0x00);
@@ -1759,7 +1759,7 @@
     static const int kLongSize = 6;
     int offset = label->Position() - buffer_.Size();
     CHECK_LE(offset, 0);
-    if (IsInt(8, offset - kShortSize)) {
+    if (IsInt<8>(offset - kShortSize)) {
       EmitUint8(0x70 + condition);
       EmitUint8((offset - kShortSize) & 0xFF);
     } else {
@@ -1796,7 +1796,7 @@
     static const int kLongSize = 5;
     int offset = label->Position() - buffer_.Size();
     CHECK_LE(offset, 0);
-    if (IsInt(8, offset - kShortSize)) {
+    if (IsInt<8>(offset - kShortSize)) {
       EmitUint8(0xEB);
       EmitUint8((offset - kShortSize) & 0xFF);
     } else {
diff --git a/compiler/utils/x86_64/assembler_x86_64.h b/compiler/utils/x86_64/assembler_x86_64.h
index a1c704e..5dfcf45 100644
--- a/compiler/utils/x86_64/assembler_x86_64.h
+++ b/compiler/utils/x86_64/assembler_x86_64.h
@@ -42,15 +42,11 @@
 
   int64_t value() const { return value_; }
 
-  bool is_int8() const { return IsInt(8, value_); }
-  bool is_uint8() const { return IsUint(8, value_); }
-  bool is_int16() const { return IsInt(16, value_); }
-  bool is_uint16() const { return IsUint(16, value_); }
-  bool is_int32() const {
-    // This does not work on 32b machines: return IsInt(32, value_);
-    int64_t limit = static_cast<int64_t>(1) << 31;
-    return (-limit <= value_) && (value_ < limit);
-  }
+  bool is_int8() const { return IsInt<8>(value_); }
+  bool is_uint8() const { return IsUint<8>(value_); }
+  bool is_int16() const { return IsInt<16>(value_); }
+  bool is_uint16() const { return IsUint<16>(value_); }
+  bool is_int32() const { return IsInt<32>(value_); }
 
  private:
   const int64_t value_;
diff --git a/compiler/utils/x86_64/assembler_x86_64_test.cc b/compiler/utils/x86_64/assembler_x86_64_test.cc
index 6df4144..00f508b 100644
--- a/compiler/utils/x86_64/assembler_x86_64_test.cc
+++ b/compiler/utils/x86_64/assembler_x86_64_test.cc
@@ -44,10 +44,10 @@
 TEST(AssemblerX86_64, SignExtension) {
   // 32bit.
   for (int32_t i = 0; i < 128; i++) {
-    EXPECT_TRUE(IsInt32(8, i)) << i;
+    EXPECT_TRUE(IsInt<8>(i)) << i;
   }
   for (int32_t i = 128; i < 255; i++) {
-    EXPECT_FALSE(IsInt32(8, i)) << i;
+    EXPECT_FALSE(IsInt<8>(i)) << i;
   }
   // Do some higher ones randomly.
   std::random_device rd;
@@ -55,54 +55,65 @@
   std::uniform_int_distribution<int32_t> uniform_dist(256, INT32_MAX);
   for (size_t i = 0; i < kRandomIterations; i++) {
     int32_t value = uniform_dist(e1);
-    EXPECT_FALSE(IsInt32(8, value)) << value;
+    EXPECT_FALSE(IsInt<8>(value)) << value;
   }
 
   // Negative ones.
   for (int32_t i = -1; i >= -128; i--) {
-    EXPECT_TRUE(IsInt32(8, i)) << i;
+    EXPECT_TRUE(IsInt<8>(i)) << i;
   }
 
   for (int32_t i = -129; i > -256; i--) {
-    EXPECT_FALSE(IsInt32(8, i)) << i;
+    EXPECT_FALSE(IsInt<8>(i)) << i;
   }
 
   // Do some lower ones randomly.
   std::uniform_int_distribution<int32_t> uniform_dist2(INT32_MIN, -256);
   for (size_t i = 0; i < 100; i++) {
     int32_t value = uniform_dist2(e1);
-    EXPECT_FALSE(IsInt32(8, value)) << value;
+    EXPECT_FALSE(IsInt<8>(value)) << value;
   }
 
   // 64bit.
   for (int64_t i = 0; i < 128; i++) {
-    EXPECT_TRUE(IsInt64(8, i)) << i;
+    EXPECT_TRUE(IsInt<8>(i)) << i;
   }
   for (int32_t i = 128; i < 255; i++) {
-    EXPECT_FALSE(IsInt64(8, i)) << i;
+    EXPECT_FALSE(IsInt<8>(i)) << i;
   }
   // Do some higher ones randomly.
   std::uniform_int_distribution<int64_t> uniform_dist3(256, INT64_MAX);
   for (size_t i = 0; i < 100; i++) {
     int64_t value = uniform_dist3(e1);
-    EXPECT_FALSE(IsInt64(8, value)) << value;
+    EXPECT_FALSE(IsInt<8>(value)) << value;
   }
 
   // Negative ones.
   for (int64_t i = -1; i >= -128; i--) {
-    EXPECT_TRUE(IsInt64(8, i)) << i;
+    EXPECT_TRUE(IsInt<8>(i)) << i;
   }
 
   for (int64_t i = -129; i > -256; i--) {
-    EXPECT_FALSE(IsInt64(8, i)) << i;
+    EXPECT_FALSE(IsInt<8>(i)) << i;
   }
 
   // Do some lower ones randomly.
   std::uniform_int_distribution<int64_t> uniform_dist4(INT64_MIN, -256);
   for (size_t i = 0; i < kRandomIterations; i++) {
     int64_t value = uniform_dist4(e1);
-    EXPECT_FALSE(IsInt64(8, value)) << value;
+    EXPECT_FALSE(IsInt<8>(value)) << value;
   }
+
+  int64_t value = INT64_C(0x1200000010);
+  x86_64::Immediate imm(value);
+  EXPECT_FALSE(imm.is_int8());
+  EXPECT_FALSE(imm.is_int16());
+  EXPECT_FALSE(imm.is_int32());
+  value = INT64_C(0x8000000000000001);
+  x86_64::Immediate imm2(value);
+  EXPECT_FALSE(imm2.is_int8());
+  EXPECT_FALSE(imm2.is_int16());
+  EXPECT_FALSE(imm2.is_int32());
 }
 
 struct X86_64CpuRegisterCompare {