Avoid going into runtime system for round-towards-zero operations on ARM.

test/mjsunit/toint32.js

 // Copyright 2008 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
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 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 function toInt32(x) {
   return x | 0;
 }
 
-assertEquals(0, toInt32(Infinity));
-assertEquals(0, toInt32(-Infinity));
-assertEquals(0, toInt32(NaN));
-assertEquals(0, toInt32(0.0));
-assertEquals(0, toInt32(-0.0));
+assertEquals(0, toInt32(Infinity), "Inf");
+assertEquals(0, toInt32(-Infinity), "-Inf");
+assertEquals(0, toInt32(NaN), "NaN");
+assertEquals(0, toInt32(0.0), "zero");
+assertEquals(0, toInt32(-0.0), "-zero");
 
 assertEquals(0, toInt32(Number.MIN_VALUE));
 assertEquals(0, toInt32(-Number.MIN_VALUE));
 assertEquals(0, toInt32(0.1));
 assertEquals(0, toInt32(-0.1));
-assertEquals(1, toInt32(1));
-assertEquals(1, toInt32(1.1));
-assertEquals(-1, toInt32(-1));
+assertEquals(1, toInt32(1), "one");
+assertEquals(1, toInt32(1.1), "onepointone");
+assertEquals(-1, toInt32(-1), "-one");
 assertEquals(0, toInt32(0.6), "truncate positive (0.6)");
 assertEquals(1, toInt32(1.6), "truncate positive (1.6)");
 assertEquals(0, toInt32(-0.6), "truncate negative (-0.6)");
 assertEquals(-1, toInt32(-1.6), "truncate negative (-1.6)");
 
 assertEquals(2147483647, toInt32(2147483647));
 assertEquals(-2147483648, toInt32(2147483648));
 assertEquals(-2147483647, toInt32(2147483649));
 
 assertEquals(-1, toInt32(4294967295));
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 assertEquals(-Math.pow(2,31), toInt32(-bignum));
 assertEquals(0, toInt32(2 * bignum));
 assertEquals(0, toInt32(-(2 * bignum)));
 assertEquals(0, toInt32(bignum - Math.pow(2,31)));
 assertEquals(0, toInt32(-(bignum - Math.pow(2,31))));
 
 // max_fraction is largest number below 1.
 var max_fraction = (1 - Math.pow(2,-53));
 assertEquals(0, toInt32(max_fraction));
 assertEquals(0, toInt32(-max_fraction));