[wasm] [asm.js] Fix various asm.js issues.

src/asmjs/asm-wasm-builder.cc

 // Copyright 2015 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.
 
 #include "src/v8.h"
 
 // Required to get M_E etc. in MSVC.
 #if defined(_WIN32)
 #define _USE_MATH_DEFINES
 #endif
@@ skipping 603 matching lines @@
       current_function_builder_->EmitCode(code, sizeof(code));
     } else if (type->IsA(AsmType::Int())) {
       // The parser can collapse !0, !1 etc to true / false.
       // Allow these as int literals.
       if (expr->raw_value()->IsTrue()) {
         byte code[] = {WASM_I32V(1)};
         current_function_builder_->EmitCode(code, sizeof(code));
       } else if (expr->raw_value()->IsFalse()) {
         byte code[] = {WASM_I32V(0)};
         current_function_builder_->EmitCode(code, sizeof(code));
+      } else if (expr->raw_value()->IsNumber()) {
+        // This can happen when -x becomes x * -1 (due to the parser).
+        int32_t i = 0;
+        if (!value->ToInt32(&i) || i != -1) {
+          UNREACHABLE();
+        }
+        byte code[] = {WASM_I32V(i)};
+        current_function_builder_->EmitCode(code, sizeof(code));
       } else {
         UNREACHABLE();
       }
     } else if (type->IsA(AsmType::Double())) {
+      // TODO(bradnelson): Pattern match the case where negation occurs and
+      // emit f64.neg instead.
       double val = expr->raw_value()->AsNumber();
       byte code[] = {WASM_F64(val)};
       current_function_builder_->EmitCode(code, sizeof(code));
+    } else if (type->IsA(AsmType::Float())) {
+      // This can happen when -fround(x) becomes fround(x) * 1.0[float]
+      // (due to the parser).
+      // TODO(bradnelson): Pattern match this and emit f32.neg instead.
+      double val = expr->raw_value()->AsNumber();
+      DCHECK_EQ(-1.0, val);
+      byte code[] = {WASM_F32(val)};
+      current_function_builder_->EmitCode(code, sizeof(code));
     } else {
       UNREACHABLE();
     }
   }
 
   void VisitRegExpLiteral(RegExpLiteral* expr) { UNREACHABLE(); }
 
   void VisitObjectLiteral(ObjectLiteral* expr) {
     ZoneList<ObjectLiteralProperty*>* props = expr->properties();
     for (int i = 0; i < props->length(); ++i) {
@@ skipping 1260 matching lines @@
   impl.builder_->WriteTo(*buffer);
   return buffer;
 }
 
 const char* AsmWasmBuilder::foreign_init_name = "__foreign_init__";
 const char* AsmWasmBuilder::single_function_name = "__single_function__";
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8