Ensure that ia32 build passes all tests with --use-ssa on.

runtime/vm/flow_graph_compiler_ia32.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "lib/error.h"
@@ skipping 24 matching lines @@
       if (registers_[i] != kNoRegister) {
         __ pushl(registers_[i]);
       }
     }
   } else {
     // We have a deoptimization environment, we have to tear down the
     // optimized frame and recreate a non-optimized one.
     const intptr_t fixed_parameter_count =
         deoptimization_env_->fixed_parameter_count();
 
-    // 1. Set the stack pointer to the top of the non-optimized frame.
     const GrowableArray<Value*>& values = deoptimization_env_->values();
-    const intptr_t local_slot_count = values.length() - fixed_parameter_count;
-    const intptr_t top_offset =
-        ParsedFunction::kFirstLocalSlotIndex - (local_slot_count - 1);
-    __ leal(ESP, Address(EBP, top_offset * kWordSize));
 
-    // 2. Build and emit a parallel move representing the frame translation.
+    // 1. Build a parallel move representing the frame translation.
     ParallelMoveInstr* move = new ParallelMoveInstr();
     for (intptr_t i = 0; i < values.length(); i++) {
       Location destination = Location::StackSlot(i - fixed_parameter_count);
       Location source = deoptimization_env_->LocationAt(i);
       if (source.IsInvalid()) {
         ASSERT(values[i]->IsConstant());
         source = Location::Constant(values[i]->AsConstant()->value());
       }
       move->AddMove(destination, source);
     }
+
+
+    const intptr_t local_slot_count = values.length() - fixed_parameter_count;
+    const intptr_t top_offset =
+        ParsedFunction::kFirstLocalSlotIndex - (local_slot_count - 1);
+
+    // ParallelMoveResolver will use push and pop to allocate internally a
+    // scratch register for memory to memory moves.  This means we have to
+    // ensure that these stack manipulations will not interfere with actual
+    // moves. If number of local slots exceed number of spill slots we need
+    // to expand reserved stack area before resolving parallel move. Otherwise
+    // we need to shrink stack area after resolving parallel move. This
+    // guarantees that all moves happen below stack pointer and will not
+    // interfere with additional push/pops.
+    const intptr_t spill_slot_count = compiler->StackSize();
+
+    if (local_slot_count > spill_slot_count) {
+      // Expand reserved stack area.
+      __ leal(ESP, Address(EBP, top_offset * kWordSize));
+    }
+
     compiler->parallel_move_resolver()->EmitNativeCode(move);
+
+    if (local_slot_count < spill_slot_count) {
+      // Shrink reserved stack area.
+      __ leal(ESP, Address(EBP, top_offset * kWordSize));
+    }
   }
 
   if (compiler->IsLeaf()) {
     Label L;
     __ call(&L);
     const intptr_t offset = assem->CodeSize();
     __ Bind(&L);
     __ popl(EAX);
     __ subl(EAX,
         Immediate(offset - AssemblerMacros::kOffsetOfSavedPCfromEntrypoint));
@@ skipping 1171 matching lines @@
   __ popl(ECX);
   __ popl(EAX);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32