[V8] Implement SIMD Boolean vector types to allow mask registers.

src/wasm/function-body-decoder-impl.h

 // Copyright 2017 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_WASM_FUNCTION_BODY_DECODER_IMPL_H_
 #define V8_WASM_FUNCTION_BODY_DECODER_IMPL_H_
 
 #include "src/wasm/decoder.h"
 #include "src/wasm/wasm-opcodes.h"
 
@@ skipping 126 matching lines @@
         return true;
       case kLocalF32:
         *result = kWasmF32;
         return true;
       case kLocalF64:
         *result = kWasmF64;
         return true;
       case kLocalS128:
         *result = kWasmS128;
         return true;
+      case kLocalS4:
+        *result = kWasmS4;

[bradnelson, 2017/02/16 23:18:30]

Maybe S1x4 for consistency?

Would using SB4/8/16 be better? Not sure.

[bbudge, 2017/02/17 23:39:56]

I like S1xN. I'm also going to change the MachineTypes kSimdBoolN to kSimd1xN to
match.

+        return true;
+      case kLocalS8:
+        *result = kWasmS8;
+        return true;
+      case kLocalS16:
+        *result = kWasmS16;
+        return true;
       default:
         *result = kWasmStmt;
         return false;
     }
   }
   ValueType read_entry(unsigned index) {
     DCHECK_LT(index, arity);
     ValueType result;
     CHECK(decode_local_type(types[index], &result));
     return result;
@@ skipping 150 matching lines @@
     shift = decoder->checked_read_u8(pc, 2, "shift");
     length = 1;
   }
 };
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_FUNCTION_BODY_DECODER_IMPL_H_