x86/x64 port of Math.floor(x/y) to use integer division for specific divisor

test/mjsunit/math-floor-of-div.js

 // 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 196 matching lines @@
   assertEquals(-min_int_in_array[0],
                Math.floor((min_int_in_array[0] | 0) / -1));
 }
 
 test_div_deopt_minus_zero();
 test_div_deopt_overflow();
 %OptimizeFunctionOnNextCall(test_div_deopt_minus_zero);
 %OptimizeFunctionOnNextCall(test_div_deopt_overflow);
 test_div_deopt_minus_zero();
 test_div_deopt_overflow();
+

[Yang, 2012/06/20 12:19:42]

Please create a new test file called math-floor-of-div-minus-zero.js, and add it
to mjsunit.status so that it is skipped on ARM and MIPS.

[Zheng Liu, 2012/06/20 13:54:15]

Done.

+if (false) {
+function test_div_no_deopt_minus_zero() {
+  var zero_in_array = [0];
+  assertTrue(0 === (Math.floor((zero_in_array[0] | 0) / -1) | 0));
+}
+
+test_div_no_deopt_minus_zero();
+%OptimizeFunctionOnNextCall(test_div_no_deopt_minus_zero);
+test_div_no_deopt_minus_zero();
+assertTrue(2 != %GetOptimizationStatus(test_div_no_deopt_minus_zero));
+}