Contribution of PowerPC port.

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
 // met:
 //
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
 
+// Helper to determine endian - returns true on little endian platforms
+function isLittleEndian() {
+  return ((new Uint32Array((new Uint8Array([4,3,2,1])).buffer))[0])
+           == 0x01020304;
+}
 
 // Test that both kinds of NaNs (signaling or quiet) do not signal
 
 function TestAllModes(f) {
   f(); // Runtime
   f(); // IC
   f(); // IC second time
   %OptimizeFunctionOnNextCall(f);
   f(); // hydrogen
 }
 
 function TestDoubleSignalingNan() {
   // NaN with signal bit set
   function f() {
+    if(isLittleEndian()) {
     var bytes = new Uint32Array([1, 0x7FF00000]);
+    } else {
+      var bytes = new Uint32Array([0x7FF00000, 1]);
+    }
     var doubles = new Float64Array(bytes.buffer);
     assertTrue(isNaN(doubles[0]));
     assertTrue(isNaN(doubles[0]*2.0));
     assertTrue(isNaN(doubles[0] + 0.5));
   }
 
   TestAllModes(f);
 }
 
 TestDoubleSignalingNan();
 
 function TestDoubleQuietNan() {
   // NaN with signal bit cleared
   function f() {
+    if(isLittleEndian()) {
     var bytes = new Uint32Array([0, 0x7FF80000]);
+    } else {
+      var bytes = new Uint32Array([0x7FF80000, 0]);
+    }
     var doubles = new Float64Array(bytes.buffer);
     assertTrue(isNaN(doubles[0]));
     assertTrue(isNaN(doubles[0]*2.0));
     assertTrue(isNaN(doubles[0] + 0.5));
   }
 
   TestAllModes(f);
 }
 
 TestDoubleQuietNan();
@@ skipping 20 matching lines @@
     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();