Harmony: optimize Math.clz32.

src/x64/assembler-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 732 matching lines @@
 
 void Assembler::bts(const Operand& dst, Register src) {
   EnsureSpace ensure_space(this);
   emit_rex_64(src, dst);
   emit(0x0F);
   emit(0xAB);
   emit_operand(src, dst);
 }
 
 
+void Assembler::bsrl(Register dst, Register src) {
+  EnsureSpace ensure_space(this);
+  emit_optional_rex_32(dst, src);
+  emit(0x0F);
+  emit(0xBD);
+  emit_modrm(dst, src);
+}
+
+
 void Assembler::call(Label* L) {
   positions_recorder()->WriteRecordedPositions();
   EnsureSpace ensure_space(this);
   // 1110 1000 #32-bit disp.
   emit(0xE8);
   if (L->is_bound()) {
     int offset = L->pos() - pc_offset() - sizeof(int32_t);
     ASSERT(offset <= 0);
     emitl(offset);
   } else if (L->is_linked()) {
@@ skipping 2418 matching lines @@
 bool RelocInfo::IsCodedSpecially() {
   // The deserializer needs to know whether a pointer is specially coded.  Being
   // specially coded on x64 means that it is a relative 32 bit address, as used
   // by branch instructions.
   return (1 << rmode_) & kApplyMask;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64