MIPS: Improve TruncateNumberToI implementation after DoubleToIStub usage (r16461).

src/mips/macro-assembler-mips.h

 // 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 740 matching lines @@
   // Alternate (inline) version for better readability with USE_DELAY_SLOT.
   inline void BranchF(BranchDelaySlot bd,
                       Label* target,
                       Label* nan,
                       Condition cc,
                       FPURegister cmp1,
                       FPURegister cmp2) {
     BranchF(target, nan, cc, cmp1, cmp2, bd);
   };
 
-  // Convert the HeapNumber pointed to by source to a 32bits signed integer
-  // dest. If the HeapNumber does not fit into a 32bits signed integer branch
-  // to not_int32 label. If FPU is available double_scratch is used but not
-  // scratch2.
-  void ConvertToInt32(Register source,
-                      Register dest,
-                      Register scratch,
-                      Register scratch2,
-                      FPURegister double_scratch,
-                      Label *not_int32);
-
   // Truncates a double using a specific rounding mode, and writes the value
   // to the result register.
   // The except_flag will contain any exceptions caused by the instruction.
   // If check_inexact is kDontCheckForInexactConversion, then the inexact
   // exception is masked.
   void EmitFPUTruncate(FPURoundingMode rounding_mode,
                        Register result,
                        DoubleRegister double_input,
                        Register scratch,
                        DoubleRegister double_scratch,
                        Register except_flag,
                        CheckForInexactConversion check_inexact
                            = kDontCheckForInexactConversion);
 
-  // Helper for EmitECMATruncate.
-  // This will truncate a floating-point value outside of the singed 32bit
-  // integer range to a 32bit signed integer.
-  // Expects the double value loaded in input_high and input_low.
-  // Exits with the answer in 'result'.
-  // Note that this code does not work for values in the 32bit range!
-  void EmitOutOfInt32RangeTruncate(Register result,
-                                   Register input_high,
-                                   Register input_low,
-                                   Register scratch);
-
   // Performs a truncating conversion of a floating point number as used by
   // the JS bitwise operations. See ECMA-262 9.5: ToInt32. Goes to 'done' if it
   // succeeds, otherwise falls through if result is saturated. On return
   // 'result' either holds answer, or is clobbered on fall through.
   //
   // Only public for the test code in test-code-stubs-arm.cc.
   void TryInlineTruncateDoubleToI(Register result,
                                   DoubleRegister input,
                                   Label* done);
 
   // Performs a truncating conversion of a floating point number as used by
   // the JS bitwise operations. See ECMA-262 9.5: ToInt32.
   // Exits with 'result' holding the answer.
   void TruncateDoubleToI(Register result, DoubleRegister double_input);
 
   // Performs a truncating conversion of a heap number as used by
   // the JS bitwise operations. See ECMA-262 9.5: ToInt32. 'result' and 'input'
   // must be different registers. Exits with 'result' holding the answer.
   void TruncateHeapNumberToI(Register result, Register object);
 
   // Converts the smi or heap number in object to an int32 using the rules
   // for ToInt32 as described in ECMAScript 9.5.: the value is truncated
   // and brought into the range -2^31 .. +2^31 - 1. 'result' and 'input' must be
   // different registers.
   void TruncateNumberToI(Register object,
                          Register result,
                          Register heap_number_map,
-                         Register scratch1,
-                         Register scratch2,
-                         Register scratch3,
+                         Register scratch,
                          Label* not_int32);
 
   // Loads the number from object into dst register.
   // If |object| is neither smi nor heap number, |not_number| is jumped to
   // with |object| still intact.
   void LoadNumber(Register object,
                   FPURegister dst,
                   Register heap_number_map,
                   Register scratch,
                   Label* not_number);
@@ skipping 802 matching lines @@
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_MIPS_MACRO_ASSEMBLER_MIPS_H_