diff --git a/src/x64/assembler-x64.cc b/src/x64/assembler-x64.cc
index 4ac3933..9cfe98a 100644
--- a/src/x64/assembler-x64.cc
+++ b/src/x64/assembler-x64.cc
@@ -1537,6 +1537,40 @@
 }
 
 
+void Assembler::repmovsb() {
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  emit(0xF3);
+  emit(0xA4);
+}
+
+
+void Assembler::repmovsw() {
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  emit(0x66);  // Operand size override.
+  emit(0xF3);
+  emit(0xA4);
+}
+
+
+void Assembler::repmovsl() {
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  emit(0xF3);
+  emit(0xA5);
+}
+
+
+void Assembler::repmovsq() {
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  emit(0xF3);
+  emit_rex_64();
+  emit(0xA5);
+}
+
+
 void Assembler::mul(Register src) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
@@ -2079,6 +2113,16 @@
 }
 
 
+void Assembler::fisttp_d(const Operand& adr) {
+  ASSERT(CpuFeatures::IsEnabled(SSE3));
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  emit_optional_rex_32(adr);
+  emit(0xDD);
+  emit_operand(1, adr);
+}
+
+
 void Assembler::fist_s(const Operand& adr) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;