Enable stub generation using Hydrogen/Lithium (again)

src/ia32/lithium-gap-resolver-ia32.cc

Index: src/ia32/lithium-gap-resolver-ia32.cc
diff --git a/src/ia32/lithium-gap-resolver-ia32.cc b/src/ia32/lithium-gap-resolver-ia32.cc
index 6428916fefa5119662d5583b10855a5a75276af7..3cd2175da900723645da504c0ceda248aefe12f8 100644
--- a/src/ia32/lithium-gap-resolver-ia32.cc
+++ b/src/ia32/lithium-gap-resolver-ia32.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 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:
@@ -191,7 +191,7 @@ int LGapResolver::CountSourceUses(LOperand* operand) {
 
 Register LGapResolver::GetFreeRegisterNot(Register reg) {
   int skip_index = reg.is(no_reg) ? -1 : Register::ToAllocationIndex(reg);
-  for (int i = 0; i < Register::kNumAllocatableRegisters; ++i) {
+  for (int i = 0; i < Register::NumAllocatableRegisters(); ++i) {
     if (source_uses_[i] == 0 && destination_uses_[i] > 0 && i != skip_index) {
       return Register::FromAllocationIndex(i);
     }
@@ -204,7 +204,7 @@ bool LGapResolver::HasBeenReset() {
   if (!moves_.is_empty()) return false;
   if (spilled_register_ >= 0) return false;
 
-  for (int i = 0; i < Register::kNumAllocatableRegisters; ++i) {
+  for (int i = 0; i < Register::NumAllocatableRegisters(); ++i) {
     if (source_uses_[i] != 0) return false;
     if (destination_uses_[i] != 0) return false;
   }
@@ -256,7 +256,7 @@ Register LGapResolver::EnsureTempRegister() {
 
   // 3. Prefer to spill a register that is not used in any remaining move
   // because it will not need to be restored until the end.
-  for (int i = 0; i < Register::kNumAllocatableRegisters; ++i) {
+  for (int i = 0; i < Register::NumAllocatableRegisters(); ++i) {
     if (source_uses_[i] == 0 && destination_uses_[i] == 0) {
       Register scratch = Register::FromAllocationIndex(i);
       __ push(scratch);
@@ -324,29 +324,38 @@ void LGapResolver::EmitMove(int index) {
     }
 
   } else if (source->IsDoubleRegister()) {
-    XMMRegister src = cgen_->ToDoubleRegister(source);
-    if (destination->IsDoubleRegister()) {
-      XMMRegister dst = cgen_->ToDoubleRegister(destination);
-      __ movaps(dst, src);
+    if (CpuFeatures::IsSupported(SSE2)) {
+      CpuFeatures::Scope scope(SSE2);
+      XMMRegister src = cgen_->ToDoubleRegister(source);
+      if (destination->IsDoubleRegister()) {
+        XMMRegister dst = cgen_->ToDoubleRegister(destination);
+        __ movaps(dst, src);
+      } else {
+        ASSERT(destination->IsDoubleStackSlot());
+        Operand dst = cgen_->ToOperand(destination);
+        __ movdbl(dst, src);
+      }
     } else {
-      ASSERT(destination->IsDoubleStackSlot());
-      Operand dst = cgen_->ToOperand(destination);
-      __ movdbl(dst, src);
+      UNREACHABLE();
     }
   } else if (source->IsDoubleStackSlot()) {
-    ASSERT(destination->IsDoubleRegister() ||
-           destination->IsDoubleStackSlot());
-    Operand src = cgen_->ToOperand(source);
-    if (destination->IsDoubleRegister()) {
-      XMMRegister dst = cgen_->ToDoubleRegister(destination);
-      __ movdbl(dst, src);
+    if (CpuFeatures::IsSupported(SSE2)) {
+      CpuFeatures::Scope scope(SSE2);
+      ASSERT(destination->IsDoubleRegister() ||
+             destination->IsDoubleStackSlot());
+      Operand src = cgen_->ToOperand(source);
+      if (destination->IsDoubleRegister()) {
+        XMMRegister dst = cgen_->ToDoubleRegister(destination);
+        __ movdbl(dst, src);
+      } else {
+        // We rely on having xmm0 available as a fixed scratch register.
+        Operand dst = cgen_->ToOperand(destination);
+        __ movdbl(xmm0, src);
+        __ movdbl(dst, xmm0);
+      }
     } else {
-      // We rely on having xmm0 available as a fixed scratch register.
-      Operand dst = cgen_->ToOperand(destination);
-      __ movdbl(xmm0, src);
-      __ movdbl(dst, xmm0);
+      UNREACHABLE();
     }
-
   } else {
     UNREACHABLE();
   }
@@ -410,6 +419,7 @@ void LGapResolver::EmitSwap(int index) {
       __ mov(src, tmp0);
     }
   } else if (source->IsDoubleRegister() && destination->IsDoubleRegister()) {
+    CpuFeatures::Scope scope(SSE2);
     // XMM register-register swap. We rely on having xmm0
     // available as a fixed scratch register.
     XMMRegister src = cgen_->ToDoubleRegister(source);