X64: Change kSmiConstantRegister to r12.

src/x64/code-stubs-x64.cc

 // Copyright 2011 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 3298 matching lines @@
                               Label* throw_normal_exception,
                               Label* throw_termination_exception,
                               Label* throw_out_of_memory_exception,
                               bool do_gc,
                               bool always_allocate_scope) {
   // rax: result parameter for PerformGC, if any.
   // rbx: pointer to C function  (C callee-saved).
   // rbp: frame pointer  (restored after C call).
   // rsp: stack pointer  (restored after C call).
   // r14: number of arguments including receiver (C callee-saved).
-  // r12: pointer to the first argument (C callee-saved).
+  // r15: pointer to the first argument (C callee-saved).
   //      This pointer is reused in LeaveExitFrame(), so it is stored in a
   //      callee-saved register.
 
   // Simple results returned in rax (both AMD64 and Win64 calling conventions).
   // Complex results must be written to address passed as first argument.
   // AMD64 calling convention: a struct of two pointers in rax+rdx
 
   // Check stack alignment.
   if (FLAG_debug_code) {
     __ CheckStackAlignment();
@@ skipping 20 matching lines @@
   if (always_allocate_scope) {
     __ movq(kScratchRegister, scope_depth);
     __ incl(Operand(kScratchRegister, 0));
   }
 
   // Call C function.
 #ifdef _WIN64
   // Windows 64-bit ABI passes arguments in rcx, rdx, r8, r9
   // Store Arguments object on stack, below the 4 WIN64 ABI parameter slots.
   __ movq(StackSpaceOperand(0), r14);  // argc.
-  __ movq(StackSpaceOperand(1), r12);  // argv.
+  __ movq(StackSpaceOperand(1), r15);  // argv.
   if (result_size_ < 2) {
     // Pass a pointer to the Arguments object as the first argument.
     // Return result in single register (rax).
     __ lea(rcx, StackSpaceOperand(0));
   } else {
     ASSERT_EQ(2, result_size_);
     // Pass a pointer to the result location as the first argument.
     __ lea(rcx, StackSpaceOperand(2));
     // Pass a pointer to the Arguments object as the second argument.
     __ lea(rdx, StackSpaceOperand(0));
   }
 
 #else  // _WIN64
   // GCC passes arguments in rdi, rsi, rdx, rcx, r8, r9.
   __ movq(rdi, r14);  // argc.
-  __ movq(rsi, r12);  // argv.
+  __ movq(rsi, r15);  // argv.
 #endif
   __ call(rbx);
   // Result is in rax - do not destroy this register!
 
   if (always_allocate_scope) {
     __ movq(kScratchRegister, scope_depth);
     __ decl(Operand(kScratchRegister, 0));
   }
 
   // Check for failure result.
@@ skipping 83 matching lines @@
   // rax: Holds the context at this point, but should not be used.
   //      On entry to code generated by GenerateCore, it must hold
   //      a failure result if the collect_garbage argument to GenerateCore
   //      is true.  This failure result can be the result of code
   //      generated by a previous call to GenerateCore.  The value
   //      of rax is then passed to Runtime::PerformGC.
   // rbx: pointer to builtin function  (C callee-saved).
   // rbp: frame pointer of exit frame  (restored after C call).
   // rsp: stack pointer (restored after C call).
   // r14: number of arguments including receiver (C callee-saved).
-  // r12: argv pointer (C callee-saved).
+  // r15: argv pointer (C callee-saved).
 
   Label throw_normal_exception;
   Label throw_termination_exception;
   Label throw_out_of_memory_exception;
 
   // Call into the runtime system.
   GenerateCore(masm,
                &throw_normal_exception,
                &throw_termination_exception,
                &throw_out_of_memory_exception,
@@ skipping 599 matching lines @@
                                                   &string_add_runtime);
 
   // Get the two characters forming the sub string.
   __ movzxbq(rbx, FieldOperand(rax, SeqAsciiString::kHeaderSize));
   __ movzxbq(rcx, FieldOperand(rdx, SeqAsciiString::kHeaderSize));
 
   // Try to lookup two character string in symbol table. If it is not found
   // just allocate a new one.
   Label make_two_character_string, make_flat_ascii_string;
   StringHelper::GenerateTwoCharacterSymbolTableProbe(
-      masm, rbx, rcx, r14, r11, rdi, r12, &make_two_character_string);
+      masm, rbx, rcx, r14, r11, rdi, r15, &make_two_character_string);
   __ IncrementCounter(&Counters::string_add_native, 1);
   __ ret(2 * kPointerSize);
 
   __ bind(&make_two_character_string);
   __ Set(rbx, 2);
   __ jmp(&make_flat_ascii_string);
 
   __ bind(&longer_than_two);
   // Check if resulting string will be flat.
   __ SmiCompare(rbx, Smi::FromInt(String::kMinNonFlatLength));
@@ skipping 1028 matching lines @@
           FieldOperand(elements, PixelArray::kExternalPointerOffset));
   __ movb(Operand(external_pointer, untagged_key, times_1, 0), untagged_value);
   __ ret(0);  // Return value in eax.
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64