[turbofan] Fix missing machine type for float32/float64 array accesses.

TEST=mjsunit/asm
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/703883002

Cr-Commit-Position: refs/heads/master@{#25128}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25128 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler/access-builder.cc

@@ -106,10 +106,10 @@ ElementAccess AccessBuilder::ForTypedArrayElement(ExternalArrayType type,
               Type::Unsigned32(), kMachUint32};
     case kExternalFloat32Array:
       return {kTypedArrayBoundsCheck, taggedness, header_size, Type::Number(),
-              kRepFloat32};
+              kMachFloat32};
     case kExternalFloat64Array:
       return {kTypedArrayBoundsCheck, taggedness, header_size, Type::Number(),
-              kRepFloat64};
+              kMachFloat64};
   }
   UNREACHABLE();
   return {kTypedArrayBoundsCheck, kUntaggedBase, 0, Type::None(), kMachNone};

test/mjsunit/asm/float32array-store-div.js

+// Copyright 2014 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.
+
+function Module(stdlib, foreign, heap) {
+  "use asm";
+  var MEM32 = new stdlib.Float32Array(heap);
+  function foo(i) {
+    MEM32[0] = (i >>> 0) / 2;
+    return MEM32[0];
+  }
+  return { foo: foo };
+}
+
+var foo = Module(this, {}, new ArrayBuffer(64 * 1024)).foo;
+assertEquals(0.5, foo(1));

test/mjsunit/asm/float64array-store-div.js

+// Copyright 2014 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.
+
+function Module(stdlib, foreign, heap) {
+  "use asm";
+  var MEM64 = new stdlib.Float64Array(heap);
+  function foo(i) {
+    MEM64[0] = (i >>> 0) / 2;
+    return MEM64[0];
+  }
+  return { foo: foo };
+}
+
+var foo = Module(this, {}, new ArrayBuffer(64 * 1024)).foo;
+assertEquals(0.5, foo(1));