diff --git a/compiler/utils/x86/assembler_x86.cc b/compiler/utils/x86/assembler_x86.cc
index a297ea3..b118f9a 100644
--- a/compiler/utils/x86/assembler_x86.cc
+++ b/compiler/utils/x86/assembler_x86.cc
@@ -613,6 +613,23 @@
 }
 
 
+void X86Assembler::ucomiss(XmmRegister a, XmmRegister b) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x0F);
+  EmitUint8(0x2E);
+  EmitXmmRegisterOperand(a, b);
+}
+
+
+void X86Assembler::ucomisd(XmmRegister a, XmmRegister b) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x66);
+  EmitUint8(0x0F);
+  EmitUint8(0x2E);
+  EmitXmmRegisterOperand(a, b);
+}
+
+
 void X86Assembler::sqrtsd(XmmRegister dst, XmmRegister src) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0xF2);