Update GetNextSpillIndex to support x32 port.

src/x64/lithium-x64.cc

 // Copyright 2012 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"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/lithium-allocator-inl.h"
 #include "src/x64/lithium-x64.h"
@@ skipping 313 matching lines @@
 
   stream->Add(" length ");
   length()->PrintTo(stream);
 
   stream->Add(" index ");
   index()->PrintTo(stream);
 }
 
 
 int LPlatformChunk::GetNextSpillIndex(RegisterKind kind) {
+  if (kind == DOUBLE_REGISTERS && kDoubleSize == 2 * kPointerSize) {
+    // Skip a slot if for a double-width slot for x32 port.
+    spill_slot_count_++;
+    // The spill slot's address is at rbp - (index + 1) * kPointerSize -
+    // StandardFrameConstants::kFixedFrameSizeFromFp. kFixedFrameSizeFromFp is
+    // 2 * kPointerSize, if rbp is aligned at 8-byte boundary, the below "|= 1"
+    // will make sure the spilled doubles are aligned at 8-byte boundary.
+    // TODO(haitao): make sure rbp is aligned at 8-byte boundary for x32 port.
+    spill_slot_count_ |= 1;
+  }
   return spill_slot_count_++;
 }
 
 
 LOperand* LPlatformChunk::GetNextSpillSlot(RegisterKind kind) {
   // All stack slots are Double stack slots on x64.
   // Alternatively, at some point, start using half-size
   // stack slots for int32 values.
   int index = GetNextSpillIndex(kind);
   if (kind == DOUBLE_REGISTERS) {
@@ skipping 2253 matching lines @@
   LOperand* function = UseRegisterAtStart(instr->function());
   LAllocateBlockContext* result =
       new(zone()) LAllocateBlockContext(context, function);
   return MarkAsCall(DefineFixed(result, rsi), instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64