9678 2006-07-01 15:09:14 -0700 fmod function of MS CRT returns NaN for x / Inf 2006-07-04 21:07:51 -0700 1 1 1 Unclassified WebKit JavaScriptCore 420+ PC Windows XP RESOLVED FIXED P2 Normal --- 1 bjoern.graf webkit-unassigned darin oldest_to_newest 47925 0 bjoern.graf 2006-07-01 15:09:14 -0700 JavaScriptCore expects fmod to return Inf for finite dividend and infinite divisor , but the MS CRT version of fmod returns NaN in these cases. 47926 1 9128 bjoern.graf 2006-07-01 15:11:38 -0700 Created attachment 9128 MS CRT fmod bug workaround where x % (1/0) = NaN, not x. The workaround checks the arguments for infinity and only calls fmod when the divisor is not infinite. Otherwise it returns the dividend. 48120 2 9128 darin 2006-07-03 18:05:48 -0700 Comment on attachment 9128 MS CRT fmod bug workaround where x % (1/0) = NaN, not x. I'd like to see this workaround in MathExtras.h rather than inline in the JavaScript-specific files. We just need a name for the fmod with the workaround, and then we can use that. It can be an inline that expands to a call to fmod on platforms other than Win32. Also, we do COMPILER(MSVC) rather than _MSC_VER for these kinds of ifdefs. I don't think we need PLATFORM(WIN) at all -- probably COMPILER(MSVC) is the whole check needed. 48138 3 9183 bjoern.graf 2006-07-03 20:20:49 -0700 Created attachment 9183 Workaround for MSVCRTs fmod function This patch implements the necessary workaround in wtf/MathExtras.h. Defining fmod inside the KJS namespace would have worked, if all call sites where in the namespace explicitly. However, being implicitly declared in the namespace and defined in it via the using namespace KJS; directive requires the #define workaround. Needed to change isinf() because NaN is not finite. 48155 4 mjs 2006-07-03 23:54:07 -0700 I think Darin's suggestion was to just use an alternate function name besides fmod at the call sites, and for non-MSVC compilers it could just expand inline to fmod. It could just be called _fmod, or fremainder or something. I actually think this solution is fine though, so I'll just r+ it. 48183 5 darin 2006-07-04 10:43:03 -0700 (In reply to comment #4) > I think Darin's suggestion was to just use an alternate function name besides > fmod at the call sites, and for non-MSVC compilers it could just expand inline > to fmod. It could just be called _fmod, or fremainder or something. I actually > think this solution is fine though, so I'll just r+ it. Maciej's right about what I was suggesting. But I think it's also OK to use a trick so it can still be fmod at the call site. I would not have called the other function _fmod, though, because those identifiers are specifically reserved for the implementation! Maybe fmodWithWorkaround or something like that. Also, if we are doing a macro, a macro that takes parameters is safer than one that just does the bare name. But I also think this is OK as-is, so I'll just leave Maciej's review flag intact. We can always enhance the technique used in MathExtras.h when and if we run into trouble. 48187 6 9193 darin 2006-07-04 12:25:52 -0700 Created attachment 9193 my alternate version of the fmod patch 48282 7 9198 darin 2006-07-04 16:40:37 -0700 Created attachment 9198 my alternate version of the fmod patch 48294 8 9198 mjs 2006-07-04 20:45:49 -0700 Comment on attachment 9198 my alternate version of the fmod patch This looks ok too, but I kinda like MathExtras.h being transparent and letting you use the normal function names. Saying wtf_fmod all over (w/ potential to mistakenly say fmod) seems worse to me than a macro solution. Agreed though that a macro with parameters would be better. 48295 9 9198 mjs 2006-07-04 20:45:49 -0700 Comment on attachment 9198 my alternate version of the fmod patch This looks ok too, but I kinda like MathExtras.h being transparent and letting you use the normal function names. Saying wtf_fmod all over (w/ potential to mistakenly say fmod) seems worse to me than a macro solution. Agreed though that a macro with parameters would be better. 48301 10 darin 2006-07-04 21:07:51 -0700 Committed revision 15155. 9128 2006-07-01 15:11:38 -0700 2006-07-03 19:15:40 -0700 MS CRT fmod bug workaround where x % (1/0) = NaN, not x. jsc-fmod.patch text/plain 1606 bjoern.graf SW5kZXg6IENoYW5nZUxvZw0KPT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PQ0KLS0tIENoYW5nZUxvZwkocmV2aXNpb24gMTUw OTEpDQorKysgQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkpDQpAQCAtMSwzICsxLDEyIEBADQorMjAw Ni14eC14eCAgQmpvZXJuIEdyYWYgICAgICA8YmpvZXJuLmdyYWZAZ21haWwuY29tPg0KKw0KKyAg ICAgICAgUmV2aWV3ZWQgYnkgYW4gdW5rbm93biBlbnRpdHkNCisNCisgICAgICAgIFdvcmthcm91 bmQgZm9yIE1TVkNSVHMgZm1vZCBmdW5jdGlvbiByZXR1cm5pbmcgTmFOIGZvciB4ICUgSW5maW5p dGUgaW5zdGVhZCBvZiB4DQorDQorICAgICAgICAqIGtqcy9ub2Rlcy5jcHA6DQorICAgICAgICAq IGtqcy9vcGVyYXRpb25zLmNwcDoNCisNCiAyMDA2LTA2LTI4ICBUaW1vdGh5IEhhdGNoZXIgIDx0 aW1vdGh5QGFwcGxlLmNvbT4NCiANCiAgICAgICAgIFByZWZlciB0aGUgU3RhYnMgZGVidWdnaW5n 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