MIPS: Fix return-value from Array.push stub when pushing non-SMI value

Load and update the arrays length in v0 to make sure the length gets
returned correctly when leaving the function.

Add new testcase.

TEST=mjsunit/array-push-non-smi-value

BUG=130022
R=jkummerow@chromium.org, plind44@gmail.com

Review URL: https://codereview.chromium.org/23589002

Patch from fs <fs@opera.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16377 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/stub-cache-mips.cc

@@ -1761,25 +1761,25 @@ Handle<Code> CallStubCompiler::CompileArrayPushCall(
                   &call_builtin,
                   DONT_DO_SMI_CHECK);
 
-      // Get the array's length into r0 and calculate new length.
-      __ lw(a0, FieldMemOperand(receiver, JSArray::kLengthOffset));
+      // Get the array's length into v0 and calculate new length.
+      __ lw(v0, FieldMemOperand(receiver, JSArray::kLengthOffset));
       STATIC_ASSERT(kSmiTagSize == 1);
       STATIC_ASSERT(kSmiTag == 0);
-      __ Addu(a0, a0, Operand(Smi::FromInt(argc)));
+      __ Addu(v0, v0, Operand(Smi::FromInt(argc)));
 
       // Get the elements' length.
       __ lw(t0, FieldMemOperand(elements, FixedArray::kLengthOffset));
 
       // Check if we could survive without allocation.
-      __ Branch(&call_builtin, gt, a0, Operand(t0));
+      __ Branch(&call_builtin, gt, v0, Operand(t0));
 
       __ lw(t0, MemOperand(sp, (argc - 1) * kPointerSize));
       __ StoreNumberToDoubleElements(
-          t0, a0, elements, a3, t1, a2, t5,
+          t0, v0, elements, a3, t1, a2, t5,
           &call_builtin, argc * kDoubleSize);
 
       // Save new length.
-      __ sw(a0, FieldMemOperand(receiver, JSArray::kLengthOffset));
+      __ sw(v0, FieldMemOperand(receiver, JSArray::kLengthOffset));
 
       // Check for a smi.
       __ DropAndRet(argc + 1);

test/mjsunit/array-push-non-smi-value.js

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Check pushes of non-SMI values.
+var a = [];
+function func() {
+  return a.push(0x40000000) > 60;
+}
+
+assertFalse(func());
+assertFalse(func());
+assertFalse(func());