diff --git a/compiler/utils/x86/assembler_x86.cc b/compiler/utils/x86/assembler_x86.cc
index e3962b4..04e815a 100644
--- a/compiler/utils/x86/assembler_x86.cc
+++ b/compiler/utils/x86/assembler_x86.cc
@@ -158,6 +158,20 @@
   EmitUint8(0xC8 + dst);
 }
 
+void X86Assembler::bsfl(Register dst, Register src) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x0F);
+  EmitUint8(0xBC);
+  EmitRegisterOperand(dst, src);
+}
+
+void X86Assembler::bsfl(Register dst, const Address& src) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x0F);
+  EmitUint8(0xBC);
+  EmitOperand(dst, src);
+}
+
 void X86Assembler::bsrl(Register dst, Register src) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x0F);
@@ -1423,6 +1437,26 @@
 }
 
 
+void X86Assembler::roll(Register reg, const Immediate& imm) {
+  EmitGenericShift(0, Operand(reg), imm);
+}
+
+
+void X86Assembler::roll(Register operand, Register shifter) {
+  EmitGenericShift(0, Operand(operand), shifter);
+}
+
+
+void X86Assembler::rorl(Register reg, const Immediate& imm) {
+  EmitGenericShift(1, Operand(reg), imm);
+}
+
+
+void X86Assembler::rorl(Register operand, Register shifter) {
+  EmitGenericShift(1, Operand(operand), shifter);
+}
+
+
 void X86Assembler::negl(Register reg) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0xF7);