ARM: Fast path for integer inputs to EmitVFPTruncate

src/arm/macro-assembler-arm.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 921 matching lines @@
   // dest. If the HeapNumber does not fit into a 32bits signed integer branch
   // to not_int32 label. If VFP3 is available double_scratch is used but not
   // scratch2.
   void ConvertToInt32(Register source,
                       Register dest,
                       Register scratch,
                       Register scratch2,
                       DwVfpRegister double_scratch,
                       Label *not_int32);
 
-  // Truncates a double using a specific rounding mode.
+  // Truncates a double using a specific rounding mode, and writes the value
+  // to the result register.
   // Clears the z flag (ne condition) if an overflow occurs.
-  // If exact_conversion is true, the z flag is also cleared if the conversion
-  // was inexact, i.e. if the double value could not be converted exactly
-  // to a 32bit integer.
+  // If kCheckForInexactConversion is passed, the z flag is also cleared if the
+  // conversion was inexact, i.e. if the double value could not be converted
+  // exactly to a 32-bit integer.
   void EmitVFPTruncate(VFPRoundingMode rounding_mode,
-                       SwVfpRegister result,
+                       Register result,
                        DwVfpRegister double_input,
-                       Register scratch1,
-                       Register scratch2,
+                       Register scratch,
+                       DwVfpRegister double_scratch,
                        CheckForInexactConversion check
                            = kDontCheckForInexactConversion);
 
   // Helper for EmitECMATruncate.
-  // This will truncate a floating-point value outside of the singed 32bit
+  // This will truncate a floating-point value outside of the signed 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
@@ skipping 434 matching lines @@
 #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_ARM_MACRO_ASSEMBLER_ARM_H_