PPC: Enable unaligned access and clean up the use of UNALIGNED_ACCESSES

src/ppc/assembler-ppc.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 1213 matching lines @@
   Register ra = src.ra();
   Register rb = src.rb();
   DCHECK(!ra.is(r0));
   emit(EXT2 | LWAX | rt.code() * B21 | ra.code() * B16 | rb.code() * B11);
 #else
   lwzx(rt, src);
 #endif
 }
 
 
+void Assembler::ldbrx(Register dst, const MemOperand& src) {
+  x_form(EXT2 | LDBRX, src.ra(), dst, src.rb(), LeaveRC);
+}
+
+
+void Assembler::lwbrx(Register dst, const MemOperand& src) {
+  x_form(EXT2 | LWBRX, src.ra(), dst, src.rb(), LeaveRC);
+}
+
+
+void Assembler::lhbrx(Register dst, const MemOperand& src) {
+  x_form(EXT2 | LHBRX, src.ra(), dst, src.rb(), LeaveRC);
+}
+
+
 void Assembler::stb(Register dst, const MemOperand& src) {
   DCHECK(!src.ra_.is(r0));
   d_form(STB, dst, src.ra(), src.offset(), true);
 }
 
 
 void Assembler::stbx(Register rs, const MemOperand& src) {
   Register ra = src.ra();
   Register rb = src.rb();
   DCHECK(!ra.is(r0));
@@ skipping 1256 matching lines @@
 
     trampoline_ = Trampoline(pc_offset() - size, tracked_branch_count_);
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC