Update GetNextSpillIndex to support x32 port.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index bb2ecc06b8e4e374e838cf2847f08221ed9f8faa..ec717504c6d7eddce1e12d90ebc65fcfa12b64e8 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -331,6 +331,12 @@ void LAccessArgumentsAt::PrintDataTo(StringStream* 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.
+    // TODO(haitao): make sure spilled doubles are aligned for x32 port.
+    spill_slot_count_++;
+    spill_slot_count_ |= 1;

[Toon Verwaest, 2014/06/12 09:12:13]

Can you comment what this is supposed to do?

[haitao.feng, 2014/06/13 05:15:24]

Done.

+  }
   return spill_slot_count_++;
 }