Fixing +fround(x) in asm typer.

test/cctest/test-asm-validator.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"
 
 #include "src/ast/ast.h"
 #include "src/ast/ast-expression-visitor.h"
 #include "src/ast/scopes.h"
 #include "src/parsing/parser.h"
@@ skipping 2014 matching lines @@
           CHECK_VAR(ceil, FUNC_N2N_TYPE);
           CHECK_VAR(x, Bounds(cache.kAsmFloat));
         }
       }
     }
     CHECK_SKIP();
   }
   CHECK_FUNC_TYPES_END
 }
 
+TEST(FloatReturnAsDouble) {
+  CHECK_FUNC_TYPES_BEGIN(
+      "function bar() { var x = fround(3.1); return +fround(x); }\n"
+      "function foo() { bar(); }") {
+    CHECK_EXPR(FunctionLiteral, FUNC_D_TYPE) {
+      CHECK_EXPR(Assignment, Bounds(cache.kAsmFloat)) {
+        CHECK_VAR(x, Bounds(cache.kAsmFloat));
+        CHECK_EXPR(Call, Bounds(cache.kAsmFloat)) {
+          CHECK_VAR(fround, FUNC_N2F_TYPE);
+          CHECK_EXPR(Literal, Bounds(cache.kAsmDouble));
+        }
+      }
+      CHECK_EXPR(BinaryOperation, Bounds(cache.kAsmDouble)) {
+        CHECK_EXPR(Call, Bounds(cache.kAsmFloat)) {
+          CHECK_VAR(fround, FUNC_N2F_TYPE);
+          CHECK_VAR(x, Bounds(cache.kAsmFloat));
+        }
+        CHECK_EXPR(Literal, Bounds(cache.kAsmDouble));
+      }
+    }
+    CHECK_SKIP();
+  }
+  CHECK_FUNC_TYPES_END
+}
 
 TEST(TypeConsistency) {
   v8::V8::Initialize();
   TypeCache cache;
   // Check the consistency of each of the main Asm.js types.
   CHECK(cache.kAsmFixnum->Is(cache.kAsmFixnum));
   CHECK(cache.kAsmFixnum->Is(cache.kAsmSigned));
   CHECK(cache.kAsmFixnum->Is(cache.kAsmUnsigned));
   CHECK(cache.kAsmFixnum->Is(cache.kAsmInt));
   CHECK(!cache.kAsmFixnum->Is(cache.kAsmFloat));
@@ skipping 336 matching lines @@
         CHECK_EXPR(BinaryOperation, Bounds(cache.kAsmDouble)) {
           CHECK_VAR(x, Bounds(cache.kAsmDouble));
           CHECK_EXPR(Literal, Bounds(cache.kAsmDouble));
         }
       }
     }
     CHECK_SKIP();
   }
   CHECK_FUNC_TYPES_END
 }