Ensure that GenerateStoreFastDoubleElement returns stored value on all paths.

BUG=chromium:91013
TEST=test/mjsunit/regress/regress-91013.js
Review URL: http://codereview.chromium.org/7551009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8781 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/stub-cache-arm.cc

@@ -4399,11 +4399,18 @@ void KeyedStoreStubCompiler::GenerateStoreFastDoubleElement(
   } else {
     destination = FloatingPointHelper::kCoreRegisters;
   }
-  __ SmiUntag(value_reg, value_reg);
+
+  Register untagged_value = receiver_reg;
+  __ SmiUntag(untagged_value, value_reg);
   FloatingPointHelper::ConvertIntToDouble(
-      masm, value_reg, destination,
-      d0, mantissa_reg, exponent_reg,  // These are: double_dst, dst1, dst2.
-      scratch4, s2);  // These are: scratch2, single_scratch.
+      masm,
+      untagged_value,
+      destination,
+      d0,
+      mantissa_reg,
+      exponent_reg,
+      scratch4,
+      s2);
   if (destination == FloatingPointHelper::kVFPRegisters) {
     CpuFeatures::Scope scope(VFP3);
     __ vstr(d0, scratch, 0);

src/ia32/stub-cache-ia32.cc

@@ -3981,10 +3981,12 @@ void KeyedStoreStubCompiler::GenerateStoreFastDoubleElement(
 
   __ bind(&smi_value);
   // Value is a smi. convert to a double and store.
-  __ SmiUntag(eax);
-  __ push(eax);
+  // Preserve original value.
+  __ mov(edx, eax);
+  __ SmiUntag(edx);
+  __ push(edx);
   __ fild_s(Operand(esp, 0));
-  __ pop(eax);
+  __ pop(edx);
   __ fstp_d(FieldOperand(edi, ecx, times_4, FixedDoubleArray::kHeaderSize));
   __ ret(0);
 

src/x64/stub-cache-x64.cc

@@ -3752,10 +3752,11 @@ void KeyedStoreStubCompiler::GenerateStoreFastDoubleElement(
 
   __ bind(&smi_value);
   // Value is a smi. convert to a double and store.
-  __ SmiToInteger32(rax, rax);
-  __ push(rax);
+  // Preserve original value.
+  __ SmiToInteger32(rdx, rax);
+  __ push(rdx);
   __ fild_s(Operand(rsp, 0));
-  __ pop(rax);
+  __ pop(rdx);
   __ SmiToInteger32(rcx, rcx);
   __ fstp_d(FieldOperand(rdi, rcx, times_8, FixedDoubleArray::kHeaderSize));
   __ ret(0);

test/mjsunit/regress/regress-91013.js

+// Copyright 2011 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.
+
+// Test that KeyedStore stub for unboxed double arrays backing store
+// correctly returns stored value as the result.
+
+// Flags: --allow-natives-syntax --unbox-double-arrays
+
+// Create array with unboxed double array backing store.
+var i = 100000;
+var a = new Array(i);
+for (var j = 0; j < i; j++) {
+  a[j] = 0.5;
+}
+
+assertTrue(%HasFastDoubleElements(a));
+
+// Store some smis into it.
+for (var j = 0; j < 10; j++) {
+  assertEquals(j, a[j] = j);
+}
+
+// Store some heap numbers into it.
+for (var j = 0; j < 10; j++) {
+  var v = j + 0.5;
+  assertEquals(v, a[j] = v);
+}