Add a utility method to the ia32 macro assembler to move a double immediate into an XMM register.

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 4682b37b16e409c23b9e962f326198fd66d183a8..530c3f5c7c508805a44ce4f8a45991ccf67f03f6 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -2856,6 +2856,23 @@ void MacroAssembler::Move(Register dst, Immediate imm) {
 }
 
 
+void MacroAssembler::Move(XMMRegister dst, double val) {
+  // TODO(titzer): recognize double constants with ExternalReferences.
+  CpuFeatureScope scope(this, SSE2);
+  uint64_t int_val = BitCast<uint64_t, double>(val);
+  if (int_val == 0) {
+    xorps(dst, dst);
+  } else {
+    int32_t lower = static_cast<int32_t>(int_val);
+    int32_t upper = static_cast<int32_t>(int_val >> kBitsPerInt);
+    push(Immediate(upper));
+    push(Immediate(lower));
+    movsd(dst, Operand(esp, 0));
+    add(esp, Immediate(kDoubleSize));
+  }
+}
+
+
 void MacroAssembler::SetCounter(StatsCounter* counter, int value) {
   if (FLAG_native_code_counters && counter->Enabled()) {
     mov(Operand::StaticVariable(ExternalReference(counter)), Immediate(value));