Introduce intrinsics for double values in Javascript.

src/ia32/lithium-codegen-ia32.cc

 // 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:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5729 matching lines @@
   __ bind(&is_smi);
   if (!input_reg.is(result_reg)) {
     __ mov(result_reg, input_reg);
   }
   __ SmiUntag(result_reg);
   __ ClampUint8(result_reg);
   __ bind(&done);
 }
 
 
+void LCodeGen::DoDoubleBits(LDoubleBits* instr) {
+  CpuFeatureScope scope(masm(), SSE2);
+  XMMRegister value_reg = ToDoubleRegister(instr->value());
+  Register result_reg = ToRegister(instr->result());
+  if (instr->hydrogen()->bits() == HDoubleBits::HIGH) {
+    if (CpuFeatures::IsSupported(SSE4_1)) {
+      CpuFeatureScope scope2(masm(), SSE4_1);
+      __ pextrd(result_reg, value_reg, 1);
+    } else {
+      XMMRegister xmm_scratch = double_scratch0();
+      __ pshufd(xmm_scratch, value_reg, 1);
+      __ movd(result_reg, xmm_scratch);
+    }
+  } else {
+    __ movd(result_reg, value_reg);
+  }
+}
+
+
+void LCodeGen::DoConstructDouble(LConstructDouble* instr) {
+  Register hi_reg = ToRegister(instr->hi());
+  Register lo_reg = ToRegister(instr->lo());
+  XMMRegister result_reg = ToDoubleRegister(instr->result());
+  CpuFeatureScope scope(masm(), SSE2);
+
+  if (CpuFeatures::IsSupported(SSE4_1)) {
+    CpuFeatureScope scope2(masm(), SSE4_1);
+    __ movd(result_reg, lo_reg);
+    __ pinsrd(result_reg, hi_reg, 1);
+  } else {
+    XMMRegister xmm_scratch = double_scratch0();
+    __ xorps(result_reg, result_reg);
+    __ movd(result_reg, hi_reg);
+    __ psllq(result_reg, 32);
+    __ movd(xmm_scratch, lo_reg);
+    __ orps(result_reg, xmm_scratch);
+  }
+}
+
+
 void LCodeGen::DoAllocate(LAllocate* instr) {
   class DeferredAllocate V8_FINAL : public LDeferredCode {
    public:
     DeferredAllocate(LCodeGen* codegen,
                      LAllocate* instr,
                      const X87Stack& x87_stack)
         : LDeferredCode(codegen, x87_stack), instr_(instr) { }
     virtual void Generate() V8_OVERRIDE {
       codegen()->DoDeferredAllocate(instr_);
     }
@@ skipping 514 matching lines @@
                               FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32