Collect type feedback on result of Math.[round|ceil|floor]

test/mjsunit/math-round-minus-zero.js

Index: test/mjsunit/math-round-minus-zero.js
diff --git a/test/mjsunit/regress/regress-3976.js b/test/mjsunit/math-round-minus-zero.js
similarity index 50%
copy from test/mjsunit/regress/regress-3976.js
copy to test/mjsunit/math-round-minus-zero.js
index efa3ac03bc05a5b1018eb1bdd0db761154f2b664..a82d91063c3d2d01d51de6d87df75f3e9835c40b 100644
--- a/test/mjsunit/regress/regress-3976.js
+++ b/test/mjsunit/math-round-minus-zero.js
@@ -25,56 +25,50 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --max-old-space-size=60 --check-handle-count
+// Flags: --allow-natives-syntax --noalways-opt
 
-table = [];
-
-for (var i = 0; i < 32; i++) {
- table[i] = String.fromCharCode(i + 0x410);
+// Test that a -0 result doesn't cause deopt loops
+function noDeoptLoop(x) {
+  return Math.round(x);
 }
-
-
-var random = (function() {
-  var seed = 10;
-  return function() {
-    seed = (seed * 1009) % 8831;
-    return seed;
-  };
-})();
-
-
-function key(length) {
-  var s = "";
-  for (var i = 0; i < length; i++) {
-    s += table[random() % 32];
-  }
-  return '"' + s + '"';
+assertEquals(0, noDeoptLoop(0.4));
+assertEquals(0, noDeoptLoop(0.4));
+assertEquals(0, noDeoptLoop(0.4));
+%OptimizeFunctionOnNextCall(noDeoptLoop);
+assertEquals(0, noDeoptLoop(0.4));
+assertEquals(0, noDeoptLoop(0.4));
+assertEquals(-Infinity, 1/noDeoptLoop(-0.4));
+assertUnoptimized(noDeoptLoop);
+assertEquals(-Infinity, 1/noDeoptLoop(-0.4));
+assertEquals(-Infinity, 1/noDeoptLoop(-0.4));
+assertEquals(-Infinity, 1/noDeoptLoop(-0.4));
+%OptimizeFunctionOnNextCall(noDeoptLoop);
+assertEquals(-Infinity, 1/noDeoptLoop(-0.4));
+assertEquals(-Infinity, 1/noDeoptLoop(-0.4));
+assertOptimized(noDeoptLoop);
+%ClearFunctionTypeFeedback(noDeoptLoop);
+%DeoptimizeFunction(noDeoptLoop);
+
+// Test that round that goes megamorphic is handled correctly.
+function notRound(x) {
+  return -x;
 }
-
-
-function value() {
-  return '[{' + '"field1" : ' + random() + ', "field2" : ' + random() + '}]';
+function testMega(f, x) {
+  return f(x);
 }
-
-
-function generate(n) {
-  var s = '{';
-  for (var i = 0; i < n; i++) {
-     if (i > 0) s += ', ';
-     s += key(random() % 10 + 7);
-     s += ':';
-     s += value();
-  }
-  s += '}';
-  return s;
+assertEquals(7, testMega(Math.round, 7.4));
+assertEquals(7, testMega(Math.round, 7.4));
+assertEquals(7, testMega(Math.round, 7.4));
+assertEquals(-7.4, testMega(notRound, 7.4));
+
+// Make sure that we can learn about round specialization from Cranskhaft, which
+// doesn't insert soft deopts for CallICs.
+function crankRoundLearn(x) {
+  return Math.round(x);
 }
-
-
-print("generating");
-
-var str = generate(50000);
-
-print("parsing "  + str.length);
-JSON.parse(str);
-
-print("done");
+%OptimizeFunctionOnNextCall(crankRoundLearn);
+assertEquals(12, crankRoundLearn(12.3));
+assertOptimized(crankRoundLearn);
+assertEquals(-Infinity, 1/crankRoundLearn(-0.4));
+assertOptimized(crankRoundLearn);
+assertEquals(-Infinity, 1/crankRoundLearn(-0.4));