X64: Port inline transcendental cache to X64.

src/x64/disasm-x64.cc

Index: src/x64/disasm-x64.cc
diff --git a/src/x64/disasm-x64.cc b/src/x64/disasm-x64.cc
index 4258ab63330428751f94d64f12dfe33614a304e6..bd912cdd221328b717a6b904a395fb808708bd95 100644
--- a/src/x64/disasm-x64.cc
+++ b/src/x64/disasm-x64.cc
@@ -996,23 +996,44 @@ int DisassemblerX64::TwoByteOpcodeInstruction(byte* data) {
   if (operand_size_ == 0x66) {
     // 0x66 0x0F prefix.
     int mod, regop, rm;
-    get_modrm(*current, &mod, &regop, &rm);
-    if (opcode == 0x6E) {
-      AppendToBuffer("movd %s,", NameOfXMMRegister(regop));
-      current += PrintRightOperand(current);
-    } else {
-      const char* mnemonic = "?";
-      if (opcode == 0x57) {
-        mnemonic = "xorpd";
-      } else if (opcode == 0x2E) {
-        mnemonic = "comisd";
-      } else if (opcode == 0x2F) {
-        mnemonic = "ucomisd";
+    if (opcode == 0x3A) {
+      byte third_byte = *current;
+      current = data + 3;
+      if (third_byte == 0x17) {
+        get_modrm(*current, &mod, &regop, &rm);
+        AppendToBuffer("extractps ");  // reg/m32, xmm, imm8
+        current += PrintRightOperand(current);
+        AppendToBuffer(", %s, %d", NameOfCPURegister(regop), (*current) & 3);
+        current += 1;
       } else {
         UnimplementedInstruction();
       }
-      AppendToBuffer("%s %s,", mnemonic, NameOfXMMRegister(regop));
-      current += PrintRightXMMOperand(current);
+    } else {
+      get_modrm(*current, &mod, &regop, &rm);
+      if (opcode == 0x6E) {
+        AppendToBuffer("mov%c %s,",
+                       rex_w() ? 'q' : 'd',
+                       NameOfXMMRegister(regop));
+        current += PrintRightOperand(current);
+      } else if (opcode == 0x7E) {
+        AppendToBuffer("mov%c %s,",
+                       rex_w() ? 'q' : 'd',
+                       NameOfCPURegister(regop));
+        current += PrintRightXMMOperand(current);
+      } else {
+        const char* mnemonic = "?";
+        if (opcode == 0x57) {
+          mnemonic = "xorpd";
+        } else if (opcode == 0x2E) {
+          mnemonic = "comisd";
+        } else if (opcode == 0x2F) {
+          mnemonic = "ucomisd";
+        } else {
+          UnimplementedInstruction();
+        }
+        AppendToBuffer("%s %s,", mnemonic, NameOfXMMRegister(regop));
+        current += PrintRightXMMOperand(current);
+      }
     }
   } else if (group_1_prefix_ == 0xF2) {
     // Beginning of instructions with prefix 0xF2.