diff --git a/compiler/utils/x86/assembler_x86.cc b/compiler/utils/x86/assembler_x86.cc
index 6a57f45..0a6ceef 100644
--- a/compiler/utils/x86/assembler_x86.cc
+++ b/compiler/utils/x86/assembler_x86.cc
@@ -1169,6 +1169,32 @@
 }
 
 
+void X86Assembler::andnpd(XmmRegister dst, XmmRegister src) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x66);
+  EmitUint8(0x0F);
+  EmitUint8(0x55);
+  EmitXmmRegisterOperand(dst, src);
+}
+
+
+void X86Assembler::andnps(XmmRegister dst, XmmRegister src) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x0F);
+  EmitUint8(0x55);
+  EmitXmmRegisterOperand(dst, src);
+}
+
+
+void X86Assembler::pandn(XmmRegister dst, XmmRegister src) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x66);
+  EmitUint8(0x0F);
+  EmitUint8(0xDF);
+  EmitXmmRegisterOperand(dst, src);
+}
+
+
 void X86Assembler::orpd(XmmRegister dst, XmmRegister src) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x66);
diff --git a/compiler/utils/x86/assembler_x86.h b/compiler/utils/x86/assembler_x86.h
index e3c123c..9d7ca77 100644
--- a/compiler/utils/x86/assembler_x86.h
+++ b/compiler/utils/x86/assembler_x86.h
@@ -487,6 +487,10 @@
   void andps(XmmRegister dst, const Address& src);
   void pand(XmmRegister dst, XmmRegister src);  // no addr variant (for now)
 
+  void andnpd(XmmRegister dst, XmmRegister src);  // no addr variant (for now)
+  void andnps(XmmRegister dst, XmmRegister src);
+  void pandn(XmmRegister dst, XmmRegister src);
+
   void orpd(XmmRegister dst, XmmRegister src);  // no addr variant (for now)
   void orps(XmmRegister dst, XmmRegister src);
   void por(XmmRegister dst, XmmRegister src);
diff --git a/compiler/utils/x86/assembler_x86_test.cc b/compiler/utils/x86/assembler_x86_test.cc
index 110d0dc..52c7507 100644
--- a/compiler/utils/x86/assembler_x86_test.cc
+++ b/compiler/utils/x86/assembler_x86_test.cc
@@ -581,6 +581,18 @@
   DriverStr(RepeatFF(&x86::X86Assembler::pand, "pand %{reg2}, %{reg1}"), "pand");
 }
 
+TEST_F(AssemblerX86Test, AndnPD) {
+  DriverStr(RepeatFF(&x86::X86Assembler::andnpd, "andnpd %{reg2}, %{reg1}"), "andnpd");
+}
+
+TEST_F(AssemblerX86Test, AndnPS) {
+  DriverStr(RepeatFF(&x86::X86Assembler::andnps, "andnps %{reg2}, %{reg1}"), "andnps");
+}
+
+TEST_F(AssemblerX86Test, PAndn) {
+  DriverStr(RepeatFF(&x86::X86Assembler::pandn, "pandn %{reg2}, %{reg1}"), "pandn");
+}
+
 TEST_F(AssemblerX86Test, OrPD) {
   DriverStr(RepeatFF(&x86::X86Assembler::orpd, "orpd %{reg2}, %{reg1}"), "orpd");
 }
diff --git a/compiler/utils/x86_64/assembler_x86_64.cc b/compiler/utils/x86_64/assembler_x86_64.cc
index 688fdcc..d7fed5b 100644
--- a/compiler/utils/x86_64/assembler_x86_64.cc
+++ b/compiler/utils/x86_64/assembler_x86_64.cc
@@ -1375,6 +1375,32 @@
   EmitXmmRegisterOperand(dst.LowBits(), src);
 }
 
+void X86_64Assembler::andnpd(XmmRegister dst, XmmRegister src) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x66);
+  EmitOptionalRex32(dst, src);
+  EmitUint8(0x0F);
+  EmitUint8(0x55);
+  EmitXmmRegisterOperand(dst.LowBits(), src);
+}
+
+void X86_64Assembler::andnps(XmmRegister dst, XmmRegister src) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitOptionalRex32(dst, src);
+  EmitUint8(0x0F);
+  EmitUint8(0x55);
+  EmitXmmRegisterOperand(dst.LowBits(), src);
+}
+
+void X86_64Assembler::pandn(XmmRegister dst, XmmRegister src) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x66);
+  EmitOptionalRex32(dst, src);
+  EmitUint8(0x0F);
+  EmitUint8(0xDF);
+  EmitXmmRegisterOperand(dst.LowBits(), src);
+}
+
 void X86_64Assembler::orpd(XmmRegister dst, XmmRegister src) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x66);
diff --git a/compiler/utils/x86_64/assembler_x86_64.h b/compiler/utils/x86_64/assembler_x86_64.h
index 480e711..93c24b8 100644
--- a/compiler/utils/x86_64/assembler_x86_64.h
+++ b/compiler/utils/x86_64/assembler_x86_64.h
@@ -515,6 +515,10 @@
   void andps(XmmRegister dst, XmmRegister src);  // no addr variant (for now)
   void pand(XmmRegister dst, XmmRegister src);
 
+  void andnpd(XmmRegister dst, XmmRegister src);  // no addr variant (for now)
+  void andnps(XmmRegister dst, XmmRegister src);
+  void pandn(XmmRegister dst, XmmRegister src);
+
   void orpd(XmmRegister dst, XmmRegister src);  // no addr variant (for now)
   void orps(XmmRegister dst, XmmRegister src);
   void por(XmmRegister dst, XmmRegister src);
diff --git a/compiler/utils/x86_64/assembler_x86_64_test.cc b/compiler/utils/x86_64/assembler_x86_64_test.cc
index ba011c9..9d62fd1 100644
--- a/compiler/utils/x86_64/assembler_x86_64_test.cc
+++ b/compiler/utils/x86_64/assembler_x86_64_test.cc
@@ -1269,6 +1269,18 @@
   DriverStr(RepeatFF(&x86_64::X86_64Assembler::pand, "pand %{reg2}, %{reg1}"), "pand");
 }
 
+TEST_F(AssemblerX86_64Test, andnpd) {
+  DriverStr(RepeatFF(&x86_64::X86_64Assembler::andnpd, "andnpd %{reg2}, %{reg1}"), "andnpd");
+}
+
+TEST_F(AssemblerX86_64Test, andnps) {
+  DriverStr(RepeatFF(&x86_64::X86_64Assembler::andnps, "andnps %{reg2}, %{reg1}"), "andnps");
+}
+
+TEST_F(AssemblerX86_64Test, Pandn) {
+  DriverStr(RepeatFF(&x86_64::X86_64Assembler::pandn, "pandn %{reg2}, %{reg1}"), "pandn");
+}
+
 TEST_F(AssemblerX86_64Test, Orps) {
   DriverStr(RepeatFF(&x86_64::X86_64Assembler::orps, "orps %{reg2}, %{reg1}"), "orps");
 }