68166 2011-09-15 08:54:11 -0700 Unsigned bit shift fails under certain conditions in 32 bit builds 2011-09-16 17:19:32 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 0 keith.thorne webkit-unassigned ap barraclough oldest_to_newest 467828 0 keith.thorne 2011-09-15 08:54:11 -0700 A code snippet will explain it best: var i = 0, value = -1698987653.3475556; var j = (value >>> (i * 8)) % 256; (I know that the value is a weird number, but it is what I had in this case). So, in the above code snippet on Webkit for windows, the formula will return -2 as the answer, which is wrong, as it should return 254 (as it does on all other browsers). If, however, you do this: var value = -1698987653.3475556; var j = (value >>> (0 * 8)) % 256; Note that I have just replaced the i with a 0, the returned value is correct. If the initial value is positive, then the first code snippet works as expected, so the point is, with a negative value and an assigned variable instead of a hard coded integer, the unsigned right shift will fail. NOTE: the modular is simply there because I had it in my code, it does not really make a difference to the bug itself NOTE 2: I did not try this with an unsigned left shift NOTE 3: A signed right shift works as expected. 468133 1 ap 2011-09-15 16:00:56 -0700 > So, in the above code snippet on Webkit for windows, the formula will return -2 as the answer, > which is wrong, as it should return 254 (as it does on all other browsers). Are you seeing this with a WebKit nightly, or with shipping Safari/WebKit 5.1? On a Mac, I'm getting 123 everywhere, including Firefox. 468316 2 barraclough 2011-09-15 23:06:04 -0700 (-1698987653.3475556 >>> 0) % 256 I believe evaluates as: ((uint32_t)(int32_t)-1698987653.3475556) % 256 ((uint32_t)-1698987653) % 256 0x9ABB817Bu % 256 0x7Bu 123 So as Alexey says, 123 is the correct result. Are you sure you were seeing -2 or 254 from this test case? 468352 3 keith.thorne 2011-09-16 00:09:56 -0700 Okay, my bad, I should have double checked the snippet in the console before posting. This here snippet breaks as it should, in the console as well: var encodeNumber = function(target, bytes, value) { var i = 0; for( ; i < bytes; i++ ) { target.push((value >>> (i * 8)) % 256); } } var target = []; var bytes = 4; var value = -1699021058.648747; encodeNumber(target, bytes, value); console.log(target); (This mirrors more the code that I am working with). The first value of the array (-2) is the problem value. 468353 4 keith.thorne 2011-09-16 00:11:00 -0700 And a quick addendum...this is only on Windows. Works fine on the Mac 468369 5 107616 ap 2011-09-16 00:43:03 -0700 Created attachment 107616 test case Attaching same test for easier verification. I can reproduce this in Safari 5.0.5 on Mac OS X when running in 32-bit mode. Haven't tested ToT. 468797 6 barraclough 2011-09-16 13:58:02 -0700 Gottcha. Hmmm, this repros with just: var value = -1699021058.1; var i = 0; print(value >>> i); (prints -1699021058, the result of unsigned right shift should never be negative). 468807 7 107722 barraclough 2011-09-16 14:28:33 -0700 Created attachment 107722 Fix 468812 8 barraclough 2011-09-16 14:32:53 -0700 I should probably add a test case for this. :-( 468848 9 107722 ggaren 2011-09-16 15:35:06 -0700 Comment on attachment 107722 Fix r=me, but please check in with a test, and be careful when conflict-resolving with r95324. 468920 10 barraclough 2011-09-16 17:19:32 -0700 Fixed in r95338 107616 2011-09-16 00:43:03 -0700 2011-09-16 00:43:03 -0700 test case test.html text/html 285 ap PHNjcmlwdD4KdmFyIGVuY29kZU51bWJlciA9IGZ1bmN0aW9uKHRhcmdldCwgYnl0ZXMsIHZhbHVl KSB7CiAgIHZhciBpID0gMDsKCiAgIGZvciggOyBpIDwgYnl0ZXM7IGkrKyApIHsKICAgICAgIHRh cmdldC5wdXNoKCh2YWx1ZSA+Pj4gKGkgKiA4KSkgJSAyNTYpOwogICB9Cn0KCnZhciB0YXJnZXQg PSBbXTsKdmFyIGJ5dGVzID0gNDsKdmFyIHZhbHVlID0gLTE2OTkwMjEwNTguNjQ4NzQ3OwplbmNv 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