Test behavior of qNaN and sNaN

test/mjsunit/nans.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
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 //
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 // 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.
 
 // Flags: --allow-natives-syntax
 
-// Test usage of static type information for loads that would otherwise
-// turn into polymorphic or generic loads.
 
-// Prepare a highly polymorphic load to be used by all tests.
-Object.prototype.load = function() { return this.property; };
-Object.prototype.load.call({ A:0, property:10 });
-Object.prototype.load.call({ A:0, B:0, property:11 });
-Object.prototype.load.call({ A:0, B:0, C:0, property:12 });
-Object.prototype.load.call({ A:0, B:0, C:0, D:0, property:13 });
-Object.prototype.load.call({ A:0, B:0, C:0, D:0, E:0, property:14 });
-Object.prototype.load.call({ A:0, B:0, C:0, D:0, E:0, F:0, property:15 });
+// Test that both kinds of NaNs (signaling or quiet) do not signal
 
-// Test for object literals.
-(function() {
-  function f(x) {
-    var object = { property:x };
-    return object.load();
+function TestAllModes(f) {
+  f(); // Runtime
+  f(); // IC
+  f(); // IC second time
+  %OptimizeFunctionOnNextCall(f);
+  f(); // hydrogen
+}
+
+function TestDoubleSignalingNan() {
+  // NaN with signal bit set
+  function f() {
+    var bytes = new Uint32Array([1, 0x7FF00000]);
+    var doubles = new Float64Array(bytes.buffer);
+    assertTrue(isNaN(doubles[0]));
+    assertTrue(isNaN(doubles[0]*2.0));
+    assertTrue(isNaN(doubles[0] + 0.5));
   }
 
-  assertSame(1, f(1));
-  assertSame(2, f(2));
-  %OptimizeFunctionOnNextCall(f);
-  assertSame(3, f(3));
-})();
+  TestAllModes(f);
+}
 
-// Test for inlined constructors.
-(function() {
-  function c(x) {
-    this.property = x;
-  }
-  function f(x) {
-    var object = new c(x);
-    return object.load();
+TestDoubleSignalingNan();
+
+function TestDoubleQuietNan() {
+  // NaN with signal bit cleared
+  function f() {
+    var bytes = new Uint32Array([0, 0x7FF80000]);
+    var doubles = new Float64Array(bytes.buffer);
+    assertTrue(isNaN(doubles[0]));
+    assertTrue(isNaN(doubles[0]*2.0));
+    assertTrue(isNaN(doubles[0] + 0.5));
   }
 
-  assertSame(1, f(1));
-  assertSame(2, f(2));
-  %OptimizeFunctionOnNextCall(f);
-  assertSame(3, f(3));
-})();
+  TestAllModes(f);
+}
+
+TestDoubleQuietNan();
+
+function TestFloatSignalingNan() {
+  // NaN with signal bit set
+  function f() {
+    var bytes = new Uint32Array([0x7F800001]);
+    var floats = new Float32Array(bytes.buffer);
+    assertTrue(isNaN(floats[0]));
+    assertTrue(isNaN(floats[0]*2.0));
+    assertTrue(isNaN(floats[0] + 0.5));
+  }
+
+  TestAllModes(f);
+}
+
+TestFloatSignalingNan();
+
+function TestFloatQuietNan() {
+  // NaN with signal bit cleared
+  function f() {
+    var bytes = new Uint32Array([0x7FC00000]);
+    var floats = new Float32Array(bytes.buffer);
+    assertTrue(isNaN(floats[0]));
+    assertTrue(isNaN(floats[0]*2.0));
+    assertTrue(isNaN(floats[0] + 0.5));
+  }
+
+  TestAllModes(f);
+}
+
+TestFloatQuietNan();
+
+
+
+