diff --git a/compiler/optimizing/loop_optimization.cc b/compiler/optimizing/loop_optimization.cc
index 94787c9..963df5a 100644
--- a/compiler/optimizing/loop_optimization.cc
+++ b/compiler/optimizing/loop_optimization.cc
@@ -173,39 +173,6 @@
   return false;
 }
 
-// Detect situations with same-extension narrower operands.
-// Returns true on success and sets is_unsigned accordingly.
-static bool IsNarrowerOperands(HInstruction* a,
-                               HInstruction* b,
-                               Primitive::Type type,
-                               /*out*/ HInstruction** r,
-                               /*out*/ HInstruction** s,
-                               /*out*/ bool* is_unsigned) {
-  if (IsSignExtensionAndGet(a, type, r) && IsSignExtensionAndGet(b, type, s)) {
-    *is_unsigned = false;
-    return true;
-  } else if (IsZeroExtensionAndGet(a, type, r) && IsZeroExtensionAndGet(b, type, s)) {
-    *is_unsigned = true;
-    return true;
-  }
-  return false;
-}
-
-// As above, single operand.
-static bool IsNarrowerOperand(HInstruction* a,
-                              Primitive::Type type,
-                              /*out*/ HInstruction** r,
-                              /*out*/ bool* is_unsigned) {
-  if (IsSignExtensionAndGet(a, type, r)) {
-    *is_unsigned = false;
-    return true;
-  } else if (IsZeroExtensionAndGet(a, type, r)) {
-    *is_unsigned = true;
-    return true;
-  }
-  return false;
-}
-
 // Detect up to two instructions a and b, and an acccumulated constant c.
 static bool IsAddConstHelper(HInstruction* instruction,
                              /*out*/ HInstruction** a,
@@ -789,7 +756,7 @@
   return !IsUsedOutsideLoop(node->loop_info, instruction) && !instruction->DoesAnyWrite();
 }
 
-// TODO: saturation arithmetic.
+// TODO: more operations and intrinsics, detect saturation arithmetic, etc.
 bool HLoopOptimization::VectorizeUse(LoopNode* node,
                                      HInstruction* instruction,
                                      bool generate_code,
@@ -900,38 +867,25 @@
       return true;
     }
     // Deal with vector restrictions.
-    HInstruction* opa = instruction->InputAt(0);
-    HInstruction* opb = instruction->InputAt(1);
-    HInstruction* r = opa;
-    bool is_unsigned = false;
     if ((HasVectorRestrictions(restrictions, kNoShift)) ||
         (instruction->IsShr() && HasVectorRestrictions(restrictions, kNoShr))) {
       return false;  // unsupported instruction
-    } else if (HasVectorRestrictions(restrictions, kNoHiBits)) {
-      // Shifts right need extra care to account for higher order bits.
-      // TODO: less likely shr/unsigned and ushr/signed can by flipping signess.
-      if (instruction->IsShr() &&
-          (!IsNarrowerOperand(opa, type, &r, &is_unsigned) || is_unsigned)) {
-        return false;  // reject, unless all operands are sign-extension narrower
-      } else if (instruction->IsUShr() &&
-                 (!IsNarrowerOperand(opa, type, &r, &is_unsigned) || !is_unsigned)) {
-        return false;  // reject, unless all operands are zero-extension narrower
-      }
+    } else if ((instruction->IsShr() || instruction->IsUShr()) &&
+               HasVectorRestrictions(restrictions, kNoHiBits)) {
+      return false;  // hibits may impact lobits; TODO: we can do better!
     }
     // Accept shift operator for vectorizable/invariant operands.
     // TODO: accept symbolic, albeit loop invariant shift factors.
-    DCHECK(r != nullptr);
-    if (generate_code && vector_mode_ != kVector) {  // de-idiom
-      r = opa;
-    }
+    HInstruction* opa = instruction->InputAt(0);
+    HInstruction* opb = instruction->InputAt(1);
     int64_t distance = 0;
-    if (VectorizeUse(node, r, generate_code, type, restrictions) &&
+    if (VectorizeUse(node, opa, generate_code, type, restrictions) &&
         IsInt64AndGet(opb, /*out*/ &distance)) {
       // Restrict shift distance to packed data type width.
       int64_t max_distance = Primitive::ComponentSize(type) * 8;
       if (0 <= distance && distance < max_distance) {
         if (generate_code) {
-          GenerateVecOp(instruction, vector_map_->Get(r), opb, type);
+          GenerateVecOp(instruction, vector_map_->Get(opa), opb, type);
         }
         return true;
       }
@@ -945,23 +899,16 @@
       case Intrinsics::kMathAbsFloat:
       case Intrinsics::kMathAbsDouble: {
         // Deal with vector restrictions.
-        HInstruction* opa = instruction->InputAt(0);
-        HInstruction* r = opa;
-        bool is_unsigned = false;
-        if (HasVectorRestrictions(restrictions, kNoAbs)) {
+        if (HasVectorRestrictions(restrictions, kNoAbs) ||
+            HasVectorRestrictions(restrictions, kNoHiBits)) {
+          // TODO: we can do better for some hibits cases.
           return false;
-        } else if (HasVectorRestrictions(restrictions, kNoHiBits) &&
-                   (!IsNarrowerOperand(opa, type, &r, &is_unsigned) || is_unsigned)) {
-          return false;  // reject, unless operand is sign-extension narrower
         }
         // Accept ABS(x) for vectorizable operand.
-        DCHECK(r != nullptr);
-        if (generate_code && vector_mode_ != kVector) {  // de-idiom
-          r = opa;
-        }
-        if (VectorizeUse(node, r, generate_code, type, restrictions)) {
+        HInstruction* opa = instruction->InputAt(0);
+        if (VectorizeUse(node, opa, generate_code, type, restrictions)) {
           if (generate_code) {
-            GenerateVecOp(instruction, vector_map_->Get(r), nullptr, type);
+            GenerateVecOp(instruction, vector_map_->Get(opa), nullptr, type);
           }
           return true;
         }
@@ -976,28 +923,18 @@
       case Intrinsics::kMathMaxFloatFloat:
       case Intrinsics::kMathMaxDoubleDouble: {
         // Deal with vector restrictions.
-        HInstruction* opa = instruction->InputAt(0);
-        HInstruction* opb = instruction->InputAt(1);
-        HInstruction* r = opa;
-        HInstruction* s = opb;
-        bool is_unsigned = false;
-        if (HasVectorRestrictions(restrictions, kNoMinMax)) {
+        if (HasVectorRestrictions(restrictions, kNoMinMax) ||
+            HasVectorRestrictions(restrictions, kNoHiBits)) {
+          // TODO: we can do better for some hibits cases.
           return false;
-        } else if (HasVectorRestrictions(restrictions, kNoHiBits) &&
-                   !IsNarrowerOperands(opa, opb, type, &r, &s, &is_unsigned)) {
-          return false;  // reject, unless all operands are same-extension narrower
         }
         // Accept MIN/MAX(x, y) for vectorizable operands.
-        DCHECK(r != nullptr && s != nullptr);
-        if (generate_code && vector_mode_ != kVector) {  // de-idiom
-          r = opa;
-          s = opb;
-        }
-        if (VectorizeUse(node, r, generate_code, type, restrictions) &&
-            VectorizeUse(node, s, generate_code, type, restrictions)) {
+        HInstruction* opa = instruction->InputAt(0);
+        HInstruction* opb = instruction->InputAt(1);
+        if (VectorizeUse(node, opa, generate_code, type, restrictions) &&
+            VectorizeUse(node, opb, generate_code, type, restrictions)) {
           if (generate_code) {
-            GenerateVecOp(
-                instruction, vector_map_->Get(r), vector_map_->Get(s), type, is_unsigned);
+            GenerateVecOp(instruction, vector_map_->Get(opa), vector_map_->Get(opb), type);
           }
           return true;
         }
@@ -1022,11 +959,11 @@
       switch (type) {
         case Primitive::kPrimBoolean:
         case Primitive::kPrimByte:
-          *restrictions |= kNoDiv;
+          *restrictions |= kNoDiv | kNoAbs;
           return TrySetVectorLength(16);
         case Primitive::kPrimChar:
         case Primitive::kPrimShort:
-          *restrictions |= kNoDiv;
+          *restrictions |= kNoDiv | kNoAbs;
           return TrySetVectorLength(8);
         case Primitive::kPrimInt:
           *restrictions |= kNoDiv;
@@ -1161,14 +1098,13 @@
 void HLoopOptimization::GenerateVecOp(HInstruction* org,
                                       HInstruction* opa,
                                       HInstruction* opb,
-                                      Primitive::Type type,
-                                      bool is_unsigned) {
+                                      Primitive::Type type) {
   if (vector_mode_ == kSequential) {
-    // Non-converting scalar code follows implicit integral promotion.
-    if (!org->IsTypeConversion() && (type == Primitive::kPrimBoolean ||
-                                     type == Primitive::kPrimByte ||
-                                     type == Primitive::kPrimChar ||
-                                     type == Primitive::kPrimShort)) {
+    // Scalar code follows implicit integral promotion.
+    if (type == Primitive::kPrimBoolean ||
+        type == Primitive::kPrimByte ||
+        type == Primitive::kPrimChar ||
+        type == Primitive::kPrimShort) {
       type = Primitive::kPrimInt;
     }
   }
@@ -1249,6 +1185,7 @@
           case Intrinsics::kMathMinLongLong:
           case Intrinsics::kMathMinFloatFloat:
           case Intrinsics::kMathMinDoubleDouble: {
+            bool is_unsigned = false;  // TODO: detect unsigned versions
             vector = new (global_allocator_)
                 HVecMin(global_allocator_, opa, opb, type, vector_length_, is_unsigned);
             break;
@@ -1257,6 +1194,7 @@
           case Intrinsics::kMathMaxLongLong:
           case Intrinsics::kMathMaxFloatFloat:
           case Intrinsics::kMathMaxDoubleDouble: {
+            bool is_unsigned = false;  // TODO: detect unsigned versions
             vector = new (global_allocator_)
                 HVecMax(global_allocator_, opa, opb, type, vector_length_, is_unsigned);
             break;
@@ -1320,7 +1258,7 @@
                                                  Primitive::Type type,
                                                  uint64_t restrictions) {
   // Test for top level arithmetic shift right x >> 1 or logical shift right x >>> 1
-  // (note whether the sign bit in wider precision is shifted in has no effect
+  // (note whether the sign bit in higher precision is shifted in has no effect
   // on the narrow precision computed by the idiom).
   int64_t distance = 0;
   if ((instruction->IsShr() ||
@@ -1331,7 +1269,6 @@
     HInstruction* b = nullptr;
     int64_t       c = 0;
     if (IsAddConst(instruction->InputAt(0), /*out*/ &a, /*out*/ &b, /*out*/ &c)) {
-      DCHECK(a != nullptr && b != nullptr);
       // Accept c == 1 (rounded) or c == 0 (not rounded).
       bool is_rounded = false;
       if (c == 1) {
@@ -1343,7 +1280,11 @@
       HInstruction* r = nullptr;
       HInstruction* s = nullptr;
       bool is_unsigned = false;
-      if (!IsNarrowerOperands(a, b, type, &r, &s, &is_unsigned)) {
+      if (IsZeroExtensionAndGet(a, type, &r) && IsZeroExtensionAndGet(b, type, &s)) {
+        is_unsigned = true;
+      } else if (IsSignExtensionAndGet(a, type, &r) && IsSignExtensionAndGet(b, type, &s)) {
+        is_unsigned = false;
+      } else {
         return false;
       }
       // Deal with vector restrictions.
@@ -1354,10 +1295,6 @@
       // Accept recognized halving add for vectorizable operands. Vectorized code uses the
       // shorthand idiomatic operation. Sequential code uses the original scalar expressions.
       DCHECK(r != nullptr && s != nullptr);
-      if (generate_code && vector_mode_ != kVector) {  // de-idiom
-        r = instruction->InputAt(0);
-        s = instruction->InputAt(1);
-      }
       if (VectorizeUse(node, r, generate_code, type, restrictions) &&
           VectorizeUse(node, s, generate_code, type, restrictions)) {
         if (generate_code) {
@@ -1371,7 +1308,12 @@
                 is_unsigned,
                 is_rounded));
           } else {
-            GenerateVecOp(instruction, vector_map_->Get(r), vector_map_->Get(s), type);
+            VectorizeUse(node, instruction->InputAt(0), generate_code, type, restrictions);
+            VectorizeUse(node, instruction->InputAt(1), generate_code, type, restrictions);
+            GenerateVecOp(instruction,
+                          vector_map_->Get(instruction->InputAt(0)),
+                          vector_map_->Get(instruction->InputAt(1)),
+                          type);
           }
         }
         return true;
diff --git a/compiler/optimizing/loop_optimization.h b/compiler/optimizing/loop_optimization.h
index 35298d4..6d5978d 100644
--- a/compiler/optimizing/loop_optimization.h
+++ b/compiler/optimizing/loop_optimization.h
@@ -137,11 +137,7 @@
                       HInstruction* opa,
                       HInstruction* opb,
                       Primitive::Type type);
-  void GenerateVecOp(HInstruction* org,
-                     HInstruction* opa,
-                     HInstruction* opb,
-                     Primitive::Type type,
-                     bool is_unsigned = false);
+  void GenerateVecOp(HInstruction* org, HInstruction* opa, HInstruction* opb, Primitive::Type type);
 
   // Vectorization idioms.
   bool VectorizeHalvingAddIdiom(LoopNode* node,
diff --git a/test/623-checker-loop-regressions/src/Main.java b/test/623-checker-loop-regressions/src/Main.java
index 3a2145bf..520e7c3 100644
--- a/test/623-checker-loop-regressions/src/Main.java
+++ b/test/623-checker-loop-regressions/src/Main.java
@@ -351,35 +351,6 @@
     }
   }
 
-  /// CHECK-START: void Main.typeConv(byte[], byte[]) loop_optimization (before)
-  /// CHECK-DAG: <<One:i\d+>>  IntConstant 1                       loop:none
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get:b\d+>>  ArrayGet [{{l\d+}},<<Phi>>]         loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Add:i\d+>>  Add [<<Get>>,<<One>>]               loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Cnv:b\d+>>  TypeConversion [<<Add>>]            loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG:               ArraySet [{{l\d+}},<<Phi>>,<<Cnv>>] loop:<<Loop>>      outer_loop:none
-  //
-  /// CHECK-START-ARM64: void Main.typeConv(byte[], byte[]) loop_optimization (after)
-  /// CHECK-DAG: <<One:i\d+>>  IntConstant 1                         loop:none
-  /// CHECK-DAG: <<Repl:d\d+>> VecReplicateScalar [<<One>>]          loop:none
-  /// CHECK-DAG: <<Phi1:i\d+>> Phi                                   loop:<<Loop1:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Load:d\d+>> VecLoad [{{l\d+}},<<Phi1>>]           loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG: <<Vadd:d\d+>> VecAdd [<<Load>>,<<Repl>>]            loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG:               VecStore [{{l\d+}},<<Phi1>>,<<Vadd>>] loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG: <<Phi2:i\d+>> Phi                                   loop:<<Loop2:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get:b\d+>>  ArrayGet [{{l\d+}},<<Phi2>>]          loop:<<Loop2>>      outer_loop:none
-  /// CHECK-DAG: <<Add:i\d+>>  Add [<<Get>>,<<One>>]                 loop:<<Loop2>>      outer_loop:none
-  /// CHECK-DAG: <<Cnv:b\d+>>  TypeConversion [<<Add>>]              loop:<<Loop2>>      outer_loop:none
-  /// CHECK-DAG:               ArraySet [{{l\d+}},<<Phi2>>,<<Cnv>>]  loop:<<Loop2>>      outer_loop:none
-  //
-  // Scalar code in cleanup loop uses correct byte type on array get and type conversion.
-  private static void typeConv(byte[] a, byte[] b) {
-    int len = Math.min(a.length, b.length);
-    for (int i = 0; i < len; i++) {
-      a[i] = (byte) (b[i] + 1);
-    }
-  }
-
   public static void main(String[] args) {
     expectEquals(10, earlyExitFirst(-1));
     for (int i = 0; i <= 10; i++) {
@@ -482,17 +453,6 @@
       expectEquals(40, bt[i]);
     }
 
-    byte[] b1 = new byte[259];  // few extra iterations
-    byte[] b2 = new byte[259];
-    for (int i = 0; i < 259; i++) {
-      b1[i] = 0;
-      b2[i] = (byte) i;
-    }
-    typeConv(b1, b2);
-    for (int i = 0; i < 259; i++) {
-      expectEquals((byte)(i + 1), b1[i]);
-    }
-
     System.out.println("passed");
   }
 
diff --git a/test/640-checker-byte-simd/src/Main.java b/test/640-checker-byte-simd/src/Main.java
index 21d71e8..10b20b8 100644
--- a/test/640-checker-byte-simd/src/Main.java
+++ b/test/640-checker-byte-simd/src/Main.java
@@ -135,10 +135,8 @@
   /// CHECK-DAG: ArraySet loop:<<Loop>>      outer_loop:none
   //
   /// CHECK-START-ARM64: void Main.sar2() loop_optimization (after)
-  /// CHECK-DAG: Phi      loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: VecLoad  loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: VecShr   loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: VecStore loop:<<Loop>>      outer_loop:none
+  //
+  // TODO: fill in when supported
   static void sar2() {
     for (int i = 0; i < 128; i++)
       a[i] >>= 2;
@@ -149,9 +147,9 @@
   /// CHECK-DAG: ArrayGet loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG: ArraySet loop:<<Loop>>      outer_loop:none
   //
-  // TODO: would need signess flip.
-  /// CHECK-START: void Main.shr2() loop_optimization (after)
-  /// CHECK-NOT: VecUShr
+  /// CHECK-START-ARM64: void Main.shr2() loop_optimization (after)
+  //
+  // TODO: fill in when supported
   static void shr2() {
     for (int i = 0; i < 128; i++)
       a[i] >>>= 2;
diff --git a/test/640-checker-char-simd/src/Main.java b/test/640-checker-char-simd/src/Main.java
index 89d4b6b..0628b36 100644
--- a/test/640-checker-char-simd/src/Main.java
+++ b/test/640-checker-char-simd/src/Main.java
@@ -134,9 +134,9 @@
   /// CHECK-DAG: ArrayGet loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG: ArraySet loop:<<Loop>>      outer_loop:none
   //
-  // TODO: would need signess flip.
-  /// CHECK-START: void Main.sar2() loop_optimization (after)
-  /// CHECK-NOT: VecShr
+  /// CHECK-START-ARM64: void Main.sar2() loop_optimization (after)
+  //
+  // TODO: fill in when supported
   static void sar2() {
     for (int i = 0; i < 128; i++)
       a[i] >>= 2;
@@ -148,10 +148,8 @@
   /// CHECK-DAG: ArraySet loop:<<Loop>>      outer_loop:none
   //
   /// CHECK-START-ARM64: void Main.shr2() loop_optimization (after)
-  /// CHECK-DAG: Phi      loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: VecLoad  loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: VecUShr  loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: VecStore loop:<<Loop>>      outer_loop:none
+  //
+  // TODO: fill in when supported
   static void shr2() {
     for (int i = 0; i < 128; i++)
       a[i] >>>= 2;
diff --git a/test/640-checker-double-simd/src/Main.java b/test/640-checker-double-simd/src/Main.java
index 5709b5d..0d4f87a 100644
--- a/test/640-checker-double-simd/src/Main.java
+++ b/test/640-checker-double-simd/src/Main.java
@@ -122,10 +122,8 @@
   /// CHECK-DAG: ArraySet loop:<<Loop>>      outer_loop:none
   //
   /// CHECK-START-ARM64: void Main.conv(long[]) loop_optimization (after)
-  /// CHECK-NOT: VecLoad
-  /// CHECK-NOT: VecStore
   //
-  // TODO: fill in when long2double is supported
+  // TODO: fill in when supported
   static void conv(long[] b) {
     for (int i = 0; i < 128; i++)
       a[i] = b[i];
diff --git a/test/640-checker-int-simd/src/Main.java b/test/640-checker-int-simd/src/Main.java
index 9ee553c..97048eb 100644
--- a/test/640-checker-int-simd/src/Main.java
+++ b/test/640-checker-int-simd/src/Main.java
@@ -136,10 +136,8 @@
   /// CHECK-DAG: ArraySet loop:<<Loop>>      outer_loop:none
   //
   /// CHECK-START-ARM64: void Main.sar2() loop_optimization (after)
-  /// CHECK-DAG: Phi      loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: VecLoad  loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: VecShr   loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: VecStore loop:<<Loop>>      outer_loop:none
+  //
+  // TODO: fill in when supported
   static void sar2() {
     for (int i = 0; i < 128; i++)
       a[i] >>= 2;
@@ -151,10 +149,8 @@
   /// CHECK-DAG: ArraySet loop:<<Loop>>      outer_loop:none
   //
   /// CHECK-START-ARM64: void Main.shr2() loop_optimization (after)
-  /// CHECK-DAG: Phi      loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: VecLoad  loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: VecUShr  loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: VecStore loop:<<Loop>>      outer_loop:none
+  //
+  // TODO: fill in when supported
   static void shr2() {
     for (int i = 0; i < 128; i++)
       a[i] >>>= 2;
diff --git a/test/640-checker-long-simd/src/Main.java b/test/640-checker-long-simd/src/Main.java
index 8f6af9d..e42c716 100644
--- a/test/640-checker-long-simd/src/Main.java
+++ b/test/640-checker-long-simd/src/Main.java
@@ -134,10 +134,8 @@
   /// CHECK-DAG: ArraySet loop:<<Loop>>      outer_loop:none
   //
   /// CHECK-START-ARM64: void Main.sar2() loop_optimization (after)
-  /// CHECK-DAG: Phi      loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: VecLoad  loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: VecShr   loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: VecStore loop:<<Loop>>      outer_loop:none
+  //
+  // TODO: fill in when supported
   static void sar2() {
     for (int i = 0; i < 128; i++)
       a[i] >>= 2;
@@ -149,10 +147,8 @@
   /// CHECK-DAG: ArraySet loop:<<Loop>>      outer_loop:none
   //
   /// CHECK-START-ARM64: void Main.shr2() loop_optimization (after)
-  /// CHECK-DAG: Phi      loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: VecLoad  loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: VecUShr  loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: VecStore loop:<<Loop>>      outer_loop:none
+  //
+  // TODO: fill in when supported
   static void shr2() {
     for (int i = 0; i < 128; i++)
       a[i] >>>= 2;
diff --git a/test/640-checker-short-simd/src/Main.java b/test/640-checker-short-simd/src/Main.java
index f62c726..241f8e6 100644
--- a/test/640-checker-short-simd/src/Main.java
+++ b/test/640-checker-short-simd/src/Main.java
@@ -135,10 +135,8 @@
   /// CHECK-DAG: ArraySet loop:<<Loop>>      outer_loop:none
   //
   /// CHECK-START-ARM64: void Main.sar2() loop_optimization (after)
-  /// CHECK-DAG: Phi      loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: VecLoad  loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: VecShr   loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: VecStore loop:<<Loop>>      outer_loop:none
+  //
+  // TODO: fill in when supported
   static void sar2() {
     for (int i = 0; i < 128; i++)
       a[i] >>= 2;
@@ -149,9 +147,9 @@
   /// CHECK-DAG: ArrayGet loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG: ArraySet loop:<<Loop>>      outer_loop:none
   //
-  // TODO: would need signess flip.
-  /// CHECK-START: void Main.shr2() loop_optimization (after)
-  /// CHECK-NOT: VecUShr
+  /// CHECK-START-ARM64: void Main.shr2() loop_optimization (after)
+  //
+  // TODO: fill in when supported
   static void shr2() {
     for (int i = 0; i < 128; i++)
       a[i] >>>= 2;
diff --git a/test/645-checker-abs-simd/src/Main.java b/test/645-checker-abs-simd/src/Main.java
index 5a63d9f..76850ab 100644
--- a/test/645-checker-abs-simd/src/Main.java
+++ b/test/645-checker-abs-simd/src/Main.java
@@ -22,67 +22,6 @@
   private static final int SPQUIET = 1 << 22;
   private static final long DPQUIET = 1L << 51;
 
-  /// CHECK-START: void Main.doitByte(byte[]) loop_optimization (before)
-  /// CHECK-DAG: Phi                                       loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: ArrayGet                                  loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: InvokeStaticOrDirect intrinsic:MathAbsInt loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: ArraySet                                  loop:<<Loop>>      outer_loop:none
-  //
-  /// CHECK-START-ARM64: void Main.doitByte(byte[]) loop_optimization (after)
-  /// CHECK-DAG: Phi                                       loop:<<Loop1:B\d+>> outer_loop:none
-  /// CHECK-DAG: VecLoad                                   loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG: VecAbs                                    loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG: VecStore                                  loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG: Phi                                       loop:<<Loop2:B\d+>> outer_loop:none
-  /// CHECK-DAG: ArrayGet                                  loop:<<Loop2>>      outer_loop:none
-  /// CHECK-DAG: InvokeStaticOrDirect intrinsic:MathAbsInt loop:<<Loop2>>      outer_loop:none
-  /// CHECK-DAG: ArraySet                                  loop:<<Loop2>>      outer_loop:none
-  //
-  /// CHECK-EVAL: "<<Loop1>>" != "<<Loop2>>"
-  private static void doitByte(byte[] x) {
-    for (int i = 0; i < x.length; i++) {
-      x[i] = (byte) Math.abs(x[i]);
-    }
-  }
-
-  /// CHECK-START: void Main.doitChar(char[]) loop_optimization (before)
-  /// CHECK-DAG: Phi                                       loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: ArrayGet                                  loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: InvokeStaticOrDirect intrinsic:MathAbsInt loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: ArraySet                                  loop:<<Loop>>      outer_loop:none
-  //
-  /// CHECK-START: void Main.doitChar(char[]) loop_optimization (after)
-  /// CHECK-NOT: VecAbs
-  private static void doitChar(char[] x) {
-    // Basically a nop due to zero extension.
-    for (int i = 0; i < x.length; i++) {
-      x[i] = (char) Math.abs(x[i]);
-    }
-  }
-
-  /// CHECK-START: void Main.doitShort(short[]) loop_optimization (before)
-  /// CHECK-DAG: Phi                                       loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: ArrayGet                                  loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: InvokeStaticOrDirect intrinsic:MathAbsInt loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: ArraySet                                  loop:<<Loop>>      outer_loop:none
-  //
-  /// CHECK-START-ARM64: void Main.doitShort(short[]) loop_optimization (after)
-  /// CHECK-DAG: Phi                                       loop:<<Loop1:B\d+>> outer_loop:none
-  /// CHECK-DAG: VecLoad                                   loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG: VecAbs                                    loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG: VecStore                                  loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG: Phi                                       loop:<<Loop2:B\d+>> outer_loop:none
-  /// CHECK-DAG: ArrayGet                                  loop:<<Loop2>>      outer_loop:none
-  /// CHECK-DAG: InvokeStaticOrDirect intrinsic:MathAbsInt loop:<<Loop2>>      outer_loop:none
-  /// CHECK-DAG: ArraySet                                  loop:<<Loop2>>      outer_loop:none
-  //
-  /// CHECK-EVAL: "<<Loop1>>" != "<<Loop2>>"
-  private static void doitShort(short[] x) {
-    for (int i = 0; i < x.length; i++) {
-      x[i] = (short) Math.abs(x[i]);
-    }
-  }
-
   /// CHECK-START: void Main.doitInt(int[]) loop_optimization (before)
   /// CHECK-DAG: Phi                                       loop:<<Loop:B\d+>> outer_loop:none
   /// CHECK-DAG: ArrayGet                                  loop:<<Loop>>      outer_loop:none
@@ -113,16 +52,8 @@
   /// CHECK-DAG: ArraySet                                   loop:<<Loop>>      outer_loop:none
   //
   /// CHECK-START-ARM64: void Main.doitLong(long[]) loop_optimization (after)
-  /// CHECK-DAG: Phi                                        loop:<<Loop1:B\d+>> outer_loop:none
-  /// CHECK-DAG: VecLoad                                    loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG: VecAbs                                     loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG: VecStore                                   loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG: Phi                                        loop:<<Loop2:B\d+>> outer_loop:none
-  /// CHECK-DAG: ArrayGet                                   loop:<<Loop2>>      outer_loop:none
-  /// CHECK-DAG: InvokeStaticOrDirect intrinsic:MathAbsLong loop:<<Loop2>>      outer_loop:none
-  /// CHECK-DAG: ArraySet                                   loop:<<Loop2>>      outer_loop:none
   //
-  /// CHECK-EVAL: "<<Loop1>>" != "<<Loop2>>"
+  // TODO: Not supported yet.
   private static void doitLong(long[] x) {
     for (int i = 0; i < x.length; i++) {
       x[i] = Math.abs(x[i]);
@@ -159,16 +90,8 @@
   /// CHECK-DAG: ArraySet                                     loop:<<Loop>>      outer_loop:none
   //
   /// CHECK-START-ARM64: void Main.doitDouble(double[]) loop_optimization (after)
-  /// CHECK-DAG: Phi                                          loop:<<Loop1:B\d+>> outer_loop:none
-  /// CHECK-DAG: VecLoad                                      loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG: VecAbs                                       loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG: VecStore                                     loop:<<Loop1>>      outer_loop:none
-  /// CHECK-DAG: Phi                                          loop:<<Loop2:B\d+>> outer_loop:none
-  /// CHECK-DAG: ArrayGet                                     loop:<<Loop2>>      outer_loop:none
-  /// CHECK-DAG: InvokeStaticOrDirect intrinsic:MathAbsDouble loop:<<Loop2>>      outer_loop:none
-  /// CHECK-DAG: ArraySet                                     loop:<<Loop2>>      outer_loop:none
   //
-  /// CHECK-EVAL: "<<Loop1>>" != "<<Loop2>>"
+  // TODO: Not supported yet.
   private static void doitDouble(double[] x) {
     for (int i = 0; i < x.length; i++) {
       x[i] = Math.abs(x[i]);
@@ -176,31 +99,6 @@
   }
 
   public static void main(String[] args) {
-    // Bytes, chars, shorts.
-    byte[] xb = new byte[256];
-    for (int i = 0; i < 256; i++) {
-      xb[i] = (byte) i;
-    }
-    doitByte(xb);
-    for (int i = 0; i < 256; i++) {
-      expectEquals32((byte) Math.abs((byte) i), xb[i]);
-    }
-    char[] xc = new char[1024 * 64];
-    for (int i = 0; i < 1024 * 64; i++) {
-      xc[i] = (char) i;
-    }
-    doitChar(xc);
-    for (int i = 0; i < 1024 *64; i++) {
-      expectEquals32((char) Math.abs((char) i), xc[i]);
-    }
-    short[] xs = new short[1024 * 64];
-    for (int i = 0; i < 1024 * 64; i++) {
-      xs[i] = (short) i;
-    }
-    doitShort(xs);
-    for (int i = 0; i < 1024 * 64; i++) {
-      expectEquals32((short) Math.abs((short) i), xs[i]);
-    }
     // Set up minint32, maxint32 and some others.
     int[] xi = new int[8];
     xi[0] = 0x80000000;
diff --git a/test/651-checker-byte-simd-minmax/src/Main.java b/test/651-checker-byte-simd-minmax/src/Main.java
index fe45807..8211ace 100644
--- a/test/651-checker-byte-simd-minmax/src/Main.java
+++ b/test/651-checker-byte-simd-minmax/src/Main.java
@@ -27,12 +27,9 @@
   /// CHECK-DAG: <<Cnv:b\d+>>  TypeConversion [<<Min>>]            loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG:               ArraySet [{{l\d+}},<<Phi>>,<<Cnv>>] loop:<<Loop>>      outer_loop:none
   //
-  /// CHECK-START-ARM64: void Main.doitMin(byte[], byte[], byte[]) loop_optimization (after)
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get1:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Get2:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Min:d\d+>>  VecMin [<<Get1>>,<<Get2>>] unsigned:false loop:<<Loop>> outer_loop:none
-  /// CHECK-DAG:               VecStore [{{l\d+}},<<Phi>>,<<Min>>] loop:<<Loop>>      outer_loop:none
+  // TODO: narrow type vectorization.
+  /// CHECK-START: void Main.doitMin(byte[], byte[], byte[]) loop_optimization (after)
+  /// CHECK-NOT: VecMin
   private static void doitMin(byte[] x, byte[] y, byte[] z) {
     int min = Math.min(x.length, Math.min(y.length, z.length));
     for (int i = 0; i < min; i++) {
@@ -40,30 +37,6 @@
     }
   }
 
-  /// CHECK-START-ARM64: void Main.doitMinUnsigned(byte[], byte[], byte[]) loop_optimization (before)
-  /// CHECK-DAG: <<I255:i\d+>> IntConstant 255                     loop:none
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get1:b\d+>> ArrayGet                            loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Get2:b\d+>> ArrayGet                            loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<And1:i\d+>> And [<<Get1>>,<<I255>>]             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<And2:i\d+>> And [<<Get2>>,<<I255>>]             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Min:i\d+>>  InvokeStaticOrDirect [<<And1>>,<<And2>>] intrinsic:MathMinIntInt loop:<<Loop>> outer_loop:none
-  /// CHECK-DAG: <<Cnv:b\d+>>  TypeConversion [<<Min>>]            loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG:               ArraySet [{{l\d+}},<<Phi>>,<<Cnv>>] loop:<<Loop>>      outer_loop:none
-  //
-  /// CHECK-START-ARM64: void Main.doitMinUnsigned(byte[], byte[], byte[]) loop_optimization (after)
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get1:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Get2:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Min:d\d+>>  VecMin [<<Get1>>,<<Get2>>] unsigned:true loop:<<Loop>> outer_loop:none
-  /// CHECK-DAG:               VecStore [{{l\d+}},<<Phi>>,<<Min>>] loop:<<Loop>>      outer_loop:none
-  private static void doitMinUnsigned(byte[] x, byte[] y, byte[] z) {
-    int min = Math.min(x.length, Math.min(y.length, z.length));
-    for (int i = 0; i < min; i++) {
-      x[i] = (byte) Math.min(y[i] & 0xff, z[i] & 0xff);
-    }
-  }
-
   /// CHECK-START: void Main.doitMax(byte[], byte[], byte[]) loop_optimization (before)
   /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
   /// CHECK-DAG: <<Get1:b\d+>> ArrayGet                            loop:<<Loop>>      outer_loop:none
@@ -72,12 +45,9 @@
   /// CHECK-DAG: <<Cnv:b\d+>>  TypeConversion [<<Max>>]            loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG:               ArraySet [{{l\d+}},<<Phi>>,<<Cnv>>] loop:<<Loop>>      outer_loop:none
   //
-  /// CHECK-START-ARM64: void Main.doitMax(byte[], byte[], byte[]) loop_optimization (after)
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get1:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Get2:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Max:d\d+>>  VecMax [<<Get1>>,<<Get2>>] unsigned:false loop:<<Loop>> outer_loop:none
-  /// CHECK-DAG:               VecStore [{{l\d+}},<<Phi>>,<<Max>>] loop:<<Loop>>      outer_loop:none
+  // TODO: narrow type vectorization.
+  /// CHECK-START: void Main.doitMax(byte[], byte[], byte[]) loop_optimization (after)
+  /// CHECK-NOT: VecMax
   private static void doitMax(byte[] x, byte[] y, byte[] z) {
     int min = Math.min(x.length, Math.min(y.length, z.length));
     for (int i = 0; i < min; i++) {
@@ -85,30 +55,6 @@
     }
   }
 
-  /// CHECK-START-ARM64: void Main.doitMaxUnsigned(byte[], byte[], byte[]) loop_optimization (before)
-  /// CHECK-DAG: <<I255:i\d+>> IntConstant 255                     loop:none
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get1:b\d+>> ArrayGet                            loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Get2:b\d+>> ArrayGet                            loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<And1:i\d+>> And [<<Get1>>,<<I255>>]             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<And2:i\d+>> And [<<Get2>>,<<I255>>]             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Max:i\d+>>  InvokeStaticOrDirect [<<And1>>,<<And2>>] intrinsic:MathMaxIntInt loop:<<Loop>> outer_loop:none
-  /// CHECK-DAG: <<Cnv:b\d+>>  TypeConversion [<<Max>>]            loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG:               ArraySet [{{l\d+}},<<Phi>>,<<Cnv>>] loop:<<Loop>>      outer_loop:none
-  //
-  /// CHECK-START-ARM64: void Main.doitMaxUnsigned(byte[], byte[], byte[]) loop_optimization (after)
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get1:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Get2:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Max:d\d+>>  VecMax [<<Get1>>,<<Get2>>] unsigned:true loop:<<Loop>> outer_loop:none
-  /// CHECK-DAG:               VecStore [{{l\d+}},<<Phi>>,<<Max>>] loop:<<Loop>>      outer_loop:none
-  private static void doitMaxUnsigned(byte[] x, byte[] y, byte[] z) {
-    int min = Math.min(x.length, Math.min(y.length, z.length));
-    for (int i = 0; i < min; i++) {
-      x[i] = (byte) Math.max(y[i] & 0xff, z[i] & 0xff);
-    }
-  }
-
   public static void main(String[] args) {
     // Initialize cross-values for all possible values.
     int total = 256 * 256;
@@ -131,21 +77,11 @@
       byte expected = (byte) Math.min(y[i], z[i]);
       expectEquals(expected, x[i]);
     }
-    doitMinUnsigned(x, y, z);
-    for (int i = 0; i < total; i++) {
-      byte expected = (byte) Math.min(y[i] & 0xff, z[i] & 0xff);
-      expectEquals(expected, x[i]);
-    }
     doitMax(x, y, z);
     for (int i = 0; i < total; i++) {
       byte expected = (byte) Math.max(y[i], z[i]);
       expectEquals(expected, x[i]);
     }
-    doitMaxUnsigned(x, y, z);
-    for (int i = 0; i < total; i++) {
-      byte expected = (byte) Math.max(y[i] & 0xff, z[i] & 0xff);
-      expectEquals(expected, x[i]);
-    }
 
     System.out.println("passed");
   }
diff --git a/test/651-checker-char-simd-minmax/src/Main.java b/test/651-checker-char-simd-minmax/src/Main.java
index e2998da..5ce7b94 100644
--- a/test/651-checker-char-simd-minmax/src/Main.java
+++ b/test/651-checker-char-simd-minmax/src/Main.java
@@ -27,12 +27,9 @@
   /// CHECK-DAG: <<Cnv:c\d+>>  TypeConversion [<<Min>>]            loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG:               ArraySet [{{l\d+}},<<Phi>>,<<Cnv>>] loop:<<Loop>>      outer_loop:none
   //
-  /// CHECK-START-ARM64: void Main.doitMin(char[], char[], char[]) loop_optimization (after)
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get1:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Get2:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Min:d\d+>>  VecMin [<<Get1>>,<<Get2>>] unsigned:true loop:<<Loop>> outer_loop:none
-  /// CHECK-DAG:               VecStore [{{l\d+}},<<Phi>>,<<Min>>] loop:<<Loop>>      outer_loop:none
+  // TODO: narrow type vectorization.
+  /// CHECK-START: void Main.doitMin(char[], char[], char[]) loop_optimization (after)
+  /// CHECK-NOT: VecMin
   private static void doitMin(char[] x, char[] y, char[] z) {
     int min = Math.min(x.length, Math.min(y.length, z.length));
     for (int i = 0; i < min; i++) {
@@ -48,12 +45,9 @@
   /// CHECK-DAG: <<Cnv:c\d+>>  TypeConversion [<<Max>>]            loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG:               ArraySet [{{l\d+}},<<Phi>>,<<Cnv>>] loop:<<Loop>>      outer_loop:none
   //
-  /// CHECK-START-ARM64: void Main.doitMax(char[], char[], char[]) loop_optimization (after)
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get1:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Get2:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Max:d\d+>>  VecMax [<<Get1>>,<<Get2>>] unsigned:true loop:<<Loop>> outer_loop:none
-  /// CHECK-DAG:               VecStore [{{l\d+}},<<Phi>>,<<Max>>] loop:<<Loop>>      outer_loop:none
+  // TODO: narrow type vectorization.
+  /// CHECK-START: void Main.doitMax(char[], char[], char[]) loop_optimization (after)
+  /// CHECK-NOT: VecMax
   private static void doitMax(char[] x, char[] y, char[] z) {
     int min = Math.min(x.length, Math.min(y.length, z.length));
     for (int i = 0; i < min; i++) {
diff --git a/test/651-checker-double-simd-minmax/src/Main.java b/test/651-checker-double-simd-minmax/src/Main.java
index cf04f85..e1711ae 100644
--- a/test/651-checker-double-simd-minmax/src/Main.java
+++ b/test/651-checker-double-simd-minmax/src/Main.java
@@ -48,7 +48,7 @@
   /// CHECK-DAG: <<Max:d\d+>>  InvokeStaticOrDirect [<<Get1>>,<<Get2>>] intrinsic:MathMaxDoubleDouble loop:<<Loop>> outer_loop:none
   /// CHECK-DAG:               ArraySet [{{l\d+}},<<Phi>>,<<Max>>] loop:<<Loop>>      outer_loop:none
   //
-  // TODO x86: 0.0 vs -0.0?
+  // TODO-x86: 0.0 vs -0.0?
   //
   /// CHECK-START-ARM64: void Main.doitMax(double[], double[], double[]) loop_optimization (after)
   /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
diff --git a/test/651-checker-int-simd-minmax/src/Main.java b/test/651-checker-int-simd-minmax/src/Main.java
index 6cee7b5..4e05a9d 100644
--- a/test/651-checker-int-simd-minmax/src/Main.java
+++ b/test/651-checker-int-simd-minmax/src/Main.java
@@ -30,7 +30,7 @@
   /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
   /// CHECK-DAG: <<Get1:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG: <<Get2:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Min:d\d+>>  VecMin [<<Get1>>,<<Get2>>] unsigned:false loop:<<Loop>> outer_loop:none
+  /// CHECK-DAG: <<Min:d\d+>>  VecMin [<<Get1>>,<<Get2>>]          loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG:               VecStore [{{l\d+}},<<Phi>>,<<Min>>] loop:<<Loop>>      outer_loop:none
   private static void doitMin(int[] x, int[] y, int[] z) {
     int min = Math.min(x.length, Math.min(y.length, z.length));
@@ -50,7 +50,7 @@
   /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
   /// CHECK-DAG: <<Get1:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG: <<Get2:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Max:d\d+>>  VecMax [<<Get1>>,<<Get2>>] unsigned:false loop:<<Loop>> outer_loop:none
+  /// CHECK-DAG: <<Max:d\d+>>  VecMax [<<Get1>>,<<Get2>>]          loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG:               VecStore [{{l\d+}},<<Phi>>,<<Max>>] loop:<<Loop>>      outer_loop:none
   private static void doitMax(int[] x, int[] y, int[] z) {
     int min = Math.min(x.length, Math.min(y.length, z.length));
diff --git a/test/651-checker-short-simd-minmax/src/Main.java b/test/651-checker-short-simd-minmax/src/Main.java
index 7cbadaf..f34f526 100644
--- a/test/651-checker-short-simd-minmax/src/Main.java
+++ b/test/651-checker-short-simd-minmax/src/Main.java
@@ -27,12 +27,9 @@
   /// CHECK-DAG: <<Cnv:s\d+>>  TypeConversion [<<Min>>]            loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG:               ArraySet [{{l\d+}},<<Phi>>,<<Cnv>>] loop:<<Loop>>      outer_loop:none
   //
-  /// CHECK-START-ARM64: void Main.doitMin(short[], short[], short[]) loop_optimization (after)
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get1:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Get2:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Min:d\d+>>  VecMin [<<Get1>>,<<Get2>>] unsigned:false loop:<<Loop>> outer_loop:none
-  /// CHECK-DAG:               VecStore [{{l\d+}},<<Phi>>,<<Min>>] loop:<<Loop>>      outer_loop:none
+  // TODO: narrow type vectorization.
+  /// CHECK-START: void Main.doitMin(short[], short[], short[]) loop_optimization (after)
+  /// CHECK-NOT: VecMin
   private static void doitMin(short[] x, short[] y, short[] z) {
     int min = Math.min(x.length, Math.min(y.length, z.length));
     for (int i = 0; i < min; i++) {
@@ -40,30 +37,6 @@
     }
   }
 
-  /// CHECK-START-ARM64: void Main.doitMinUnsigned(short[], short[], short[]) loop_optimization (before)
-  /// CHECK-DAG: <<IMAX:i\d+>> IntConstant 65535                   loop:none
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get1:s\d+>> ArrayGet                            loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Get2:s\d+>> ArrayGet                            loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<And1:i\d+>> And [<<Get1>>,<<IMAX>>]             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<And2:i\d+>> And [<<Get2>>,<<IMAX>>]             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Min:i\d+>>  InvokeStaticOrDirect [<<And1>>,<<And2>>] intrinsic:MathMinIntInt loop:<<Loop>> outer_loop:none
-  /// CHECK-DAG: <<Cnv:b\d+>>  TypeConversion [<<Min>>]            loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG:               ArraySet [{{l\d+}},<<Phi>>,<<Cnv>>] loop:<<Loop>>      outer_loop:none
-  //
-  /// CHECK-START-ARM64: void Main.doitMinUnsigned(short[], short[], short[]) loop_optimization (after)
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get1:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Get2:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Min:d\d+>>  VecMin [<<Get1>>,<<Get2>>] unsigned:true loop:<<Loop>> outer_loop:none
-  /// CHECK-DAG:               VecStore [{{l\d+}},<<Phi>>,<<Min>>] loop:<<Loop>>      outer_loop:none
-  private static void doitMinUnsigned(short[] x, short[] y, short[] z) {
-    int min = Math.min(x.length, Math.min(y.length, z.length));
-    for (int i = 0; i < min; i++) {
-      x[i] = (short) Math.min(y[i] & 0xffff, z[i] & 0xffff);
-    }
-  }
-
   /// CHECK-START: void Main.doitMax(short[], short[], short[]) loop_optimization (before)
   /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
   /// CHECK-DAG: <<Get1:s\d+>> ArrayGet                            loop:<<Loop>>      outer_loop:none
@@ -72,12 +45,9 @@
   /// CHECK-DAG: <<Cnv:s\d+>>  TypeConversion [<<Max>>]            loop:<<Loop>>      outer_loop:none
   /// CHECK-DAG:               ArraySet [{{l\d+}},<<Phi>>,<<Cnv>>] loop:<<Loop>>      outer_loop:none
   //
-  /// CHECK-START-ARM64: void Main.doitMax(short[], short[], short[]) loop_optimization (after)
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get1:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Get2:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Max:d\d+>>  VecMax [<<Get1>>,<<Get2>>] unsigned:false loop:<<Loop>> outer_loop:none
-  /// CHECK-DAG:               VecStore [{{l\d+}},<<Phi>>,<<Max>>] loop:<<Loop>>      outer_loop:none
+  // TODO: narrow type vectorization.
+  /// CHECK-START: void Main.doitMax(short[], short[], short[]) loop_optimization (after)
+  /// CHECK-NOT: VecMax
   private static void doitMax(short[] x, short[] y, short[] z) {
     int min = Math.min(x.length, Math.min(y.length, z.length));
     for (int i = 0; i < min; i++) {
@@ -85,30 +55,6 @@
     }
   }
 
-  /// CHECK-START-ARM64: void Main.doitMaxUnsigned(short[], short[], short[]) loop_optimization (before)
-  /// CHECK-DAG: <<IMAX:i\d+>> IntConstant 65535                   loop:none
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get1:s\d+>> ArrayGet                            loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Get2:s\d+>> ArrayGet                            loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<And1:i\d+>> And [<<Get1>>,<<IMAX>>]             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<And2:i\d+>> And [<<Get2>>,<<IMAX>>]             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Max:i\d+>>  InvokeStaticOrDirect [<<And1>>,<<And2>>] intrinsic:MathMaxIntInt loop:<<Loop>> outer_loop:none
-  /// CHECK-DAG: <<Cnv:b\d+>>  TypeConversion [<<Max>>]            loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG:               ArraySet [{{l\d+}},<<Phi>>,<<Cnv>>] loop:<<Loop>>      outer_loop:none
-  //
-  /// CHECK-START-ARM64: void Main.doitMaxUnsigned(short[], short[], short[]) loop_optimization (after)
-  /// CHECK-DAG: <<Phi:i\d+>>  Phi                                 loop:<<Loop:B\d+>> outer_loop:none
-  /// CHECK-DAG: <<Get1:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Get2:d\d+>> VecLoad                             loop:<<Loop>>      outer_loop:none
-  /// CHECK-DAG: <<Max:d\d+>>  VecMax [<<Get1>>,<<Get2>>] unsigned:true loop:<<Loop>> outer_loop:none
-  /// CHECK-DAG:               VecStore [{{l\d+}},<<Phi>>,<<Max>>] loop:<<Loop>>      outer_loop:none
-  private static void doitMaxUnsigned(short[] x, short[] y, short[] z) {
-    int min = Math.min(x.length, Math.min(y.length, z.length));
-    for (int i = 0; i < min; i++) {
-      x[i] = (short) Math.max(y[i] & 0xffff, z[i] & 0xffff);
-    }
-  }
-
   public static void main(String[] args) {
     short[] interesting = {
       (short) 0x0000, (short) 0x0001, (short) 0x007f,
@@ -145,21 +91,11 @@
       short expected = (short) Math.min(y[i], z[i]);
       expectEquals(expected, x[i]);
     }
-    doitMinUnsigned(x, y, z);
-    for (int i = 0; i < total; i++) {
-      short expected = (short) Math.min(y[i] & 0xffff, z[i] & 0xffff);
-      expectEquals(expected, x[i]);
-    }
     doitMax(x, y, z);
     for (int i = 0; i < total; i++) {
       short expected = (short) Math.max(y[i], z[i]);
       expectEquals(expected, x[i]);
     }
-    doitMaxUnsigned(x, y, z);
-    for (int i = 0; i < total; i++) {
-      short expected = (short) Math.max(y[i] & 0xffff, z[i] & 0xffff);
-      expectEquals(expected, x[i]);
-    }
 
     System.out.println("passed");
   }