X64: Convert smis to holding 32 bits of payload.

test/mjsunit/regress/regress-1199401.js

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 // Ensure that we can correctly change the sign of the most negative smi.
 
-assertEquals(1073741824, -1073741824 * -1);
-assertEquals(1073741824, -1073741824 / -1);
-assertEquals(1073741824, -(-1073741824));
-assertEquals(1073741824, 0 - (-1073741824));
+// Possible Smi ranges.
+var ranges = [{min: -1073741824, max: 1073741823, bits: 31},
+              {min: -2147483648, max: 2147483647, bits: 32}];
 
-var min_smi = -1073741824;
+for (var i = 0; i < ranges.length; i++) {
+  var range = ranges[i];
+  var min_smi = range.min;
+  var max_smi = range.max;
+  var bits = range.bits;
+  var name = bits + "-bit";
 
-assertEquals(1073741824, min_smi * -1);
-assertEquals(1073741824, min_smi / -1);
-assertEquals(1073741824, -min_smi);
-assertEquals(1073741824, 0 - min_smi);
+  var result = max_smi + 1;
 
-var zero = 0;
-var minus_one = -1;
+  // Min smi as literal
+  assertEquals(result, eval(min_smi + " * -1"), name + "-litconmult");
+  assertEquals(result, eval(min_smi + " / -1"), name + "-litcondiv");
+  assertEquals(result, eval("-(" + min_smi + ")"), name + "-litneg");
+  assertEquals(result, eval("0 - (" + min_smi + ")")), name + "-conlitsub";
 
-assertEquals(1073741824, min_smi * minus_one);
-assertEquals(1073741824, min_smi / minus_one);
-assertEquals(1073741824, -min_smi);
-assertEquals(1073741824, zero - min_smi);
+  // As variable:
+  assertEquals(result, min_smi * -1, name + "-varconmult");
+  assertEquals(result, min_smi / -1, name + "-varcondiv");
+  assertEquals(result, -min_smi, name + "-varneg");
+  assertEquals(result, 0 - min_smi, name + "-convarsub");
 
-assertEquals(1073741824, -1073741824 * minus_one);
-assertEquals(1073741824, -1073741824 / minus_one);
-assertEquals(1073741824, -(-1073741824));
-assertEquals(1073741824, zero - (-1073741824));
+  // Only variables:
+  var zero = 0;
+  var minus_one = -1;
 
-var half_min_smi = -(1<<15);
-var half_max_smi = (1<<15);
+  assertEquals(result, min_smi * minus_one, name + "-varvarmult");
+  assertEquals(result, min_smi / minus_one, name + "-varvardiv");
+  assertEquals(result, zero - min_smi, name + "-varvarsub");
 
-assertEquals(1073741824, -half_min_smi * half_max_smi);
-assertEquals(1073741824, half_min_smi * -half_max_smi);
-assertEquals(1073741824, half_max_smi * -half_min_smi);
-assertEquals(1073741824, -half_max_smi * half_min_smi);
+  // Constants as variables
+  assertEquals(result, eval(min_smi + " * minus_one"), name + "-litvarmult");
+  assertEquals(result, eval(min_smi + " / minus_one"), name + "-litvarmdiv");
+  assertEquals(result, eval("0 - (" + min_smi + ")"), name + "-varlitsub");
+
+  var half_min_smi = -(1 << (bits >> 1));
+  var half_max_smi = 1 << ((bits - 1) >> 1);
+
+  assertEquals(max_smi + 1, -half_min_smi * half_max_smi, name + "-half1");
+  assertEquals(max_smi + 1, half_min_smi * -half_max_smi, name + "-half2");
+  assertEquals(max_smi + 1, half_max_smi * -half_min_smi, name + "-half3");
+  assertEquals(max_smi + 1, -half_max_smi * half_min_smi, name + "-half4");
+}