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

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/197233011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20160 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

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));

src/ia32/macro-assembler-ia32.h

@@ -850,6 +850,9 @@ class MacroAssembler: public Assembler {
   // Move a constant into a register using the most efficient encoding.
   void Move(Register dst, Immediate imm);
 
+  // Move an immediate into an XMM register.
+  void Move(XMMRegister dst, double val);
+
   // Push a handle value.
   void Push(Handle<Object> handle) { push(Immediate(handle)); }
   void Push(Smi* smi) { Push(Handle<Smi>(smi, isolate())); }

test/cctest/test-macro-assembler-ia32.cc

@@ -123,6 +123,23 @@ TEST(LoadAndStoreWithRepresentation) {
   __ j(not_equal, &exit);
 
   // Test 5.
+  if (CpuFeatures::IsSupported(SSE2)) {
+    CpuFeatureScope scope(masm, SSE2);
+    __ mov(eax, Immediate(5));  // Test XMM move immediate.
+    __ Move(xmm0, 0.0);
+    __ Move(xmm1, 0.0);
+    __ ucomisd(xmm0, xmm1);
+    __ j(not_equal, &exit);
+    __ Move(xmm2, 991.01);
+    __ ucomisd(xmm0, xmm2);
+    __ j(equal, &exit);
+    __ Move(xmm0, 991.01);
+    __ ucomisd(xmm0, xmm2);
+    __ j(not_equal, &exit);
+  }
+
+  // Test 6.
+  __ mov(eax, Immediate(6));
   __ Move(edx, Immediate(0));  // Test Move()
   __ cmp(edx, Immediate(0));
   __ j(not_equal, &exit);