[arm] Use single instruction tail call sequence.

src/arm/macro-assembler-arm.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 41 matching lines @@
 }
 
 
 void MacroAssembler::Jump(Register target, Condition cond) {
   bx(target, cond);
 }
 
 
 void MacroAssembler::Jump(intptr_t target, RelocInfo::Mode rmode,
                           Condition cond) {
-  mov(ip, Operand(target, rmode));
-  bx(ip, cond);
+  // 'target' is always generated ARM code, never THUMB code.

[ulan, 2013/12/12 09:42:16]

Maybe assert that rmode is not external reference.

[Rodolph Perfetta, 2013/12/12 09:50:30]

on armv5t and above this will interwork properly, no need to assert.

[Benedikt Meurer, 2013/12/12 12:23:51]

Done.

[Benedikt Meurer, 2013/12/12 12:23:51]

Done.

+  ASSERT_EQ(0, target & 0x3);
+  mov(pc, Operand(target, rmode), LeaveCC, cond);
 }
 
 
 void MacroAssembler::Jump(Address target, RelocInfo::Mode rmode,
                           Condition cond) {
   ASSERT(!RelocInfo::IsCodeTarget(rmode));
   Jump(reinterpret_cast<intptr_t>(target), rmode, cond);
 }
 
 
@@ skipping 4005 matching lines @@
 void CodePatcher::EmitCondition(Condition cond) {
   Instr instr = Assembler::instr_at(masm_.pc_);
   instr = (instr & ~kCondMask) | cond;
   masm_.emit(instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM