232679 2021-11-03 12:58:26 -0700 We need to PreferNumber when calling toPrimitive for negate 2021-11-08 09:06:23 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Local Build PC Linux RESOLVED FIXED InRadar P2 Normal --- 1 lukas.bernhard saam ashvayka ews-watchlist keith_miller lukas.bernhard mark.lam msaboff saam tzagallo webkit-bug-importer oldest_to_newest 1811600 0 lukas.bernhard 2021-11-03 12:58:26 -0700 During differential testing of webkit I found a sample triggering a miscomputation in FTL related to using Date in a negative integer context. The sample is invoked as: WebKitBuild/Release/bin/jsc --validateOptions=true --useConcurrentJIT=false --useConcurrentGC=false --thresholdForJITSoon=10 --thresholdForJITAfterWarmUp=10 --thresholdForOptimizeAfterWarmUp=100 --thresholdForOptimizeAfterLongWarmUp=100 --thresholdForOptimizeSoon=100 --thresholdForFTLOptimizeAfterWarmUp=1000 --thresholdForFTLOptimizeSoon=1000 --validateBCE=true --useFTLJIT=true sample.js function main() { let v1 = 0; while (v1++ < 9) { } let v19 = 0; let v45; do { function v22() { "a".charCodeAt(undefined); const v44 = new Date(123); v45 = -v44; for (let v49 = -4096; v49 < 100; v49++) { } } v22(); } while (v19++ < 7); print(v45); // -123 without FTL, NaN with FTL (also -123 in spidermonkey) } main(); 1811924 1 443329 saam 2021-11-04 11:56:27 -0700 Created attachment 443329 Patch 1811926 2 443329 ashvayka 2021-11-04 11:58:41 -0700 Comment on attachment 443329 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=443329&action=review > JSTests/ChangeLog:8 > + * stress/negate-prfer-number-to-primitive.js: Added. (nit) filename typo: "prefer" 1811927 3 443330 saam 2021-11-04 12:01:31 -0700 Created attachment 443330 patch for landing 1812634 4 ews-feeder 2021-11-08 09:05:42 -0800 Committed r285406 (243963@main): <https://commits.webkit.org/243963@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 443330. 1812635 5 webkit-bug-importer 2021-11-08 09:06:23 -0800 <rdar://problem/85157764> 443329 2021-11-04 11:56:27 -0700 2021-11-04 12:01:31 -0700 Patch a-backup.diff text/plain 3835 saam SW5kZXg6IEpTVGVzdHMvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIEpTVGVzdHMvQ2hhbmdlTG9n CShyZXZpc2lvbiAyODUyNzIpCisrKyBKU1Rlc3RzL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpA QCAtMSwzICsxLDE1IEBACisyMDIxLTExLTA0ICBTYWFtIEJhcmF0aSAgPHNiYXJhdGlAYXBwbGUu Y29tPgorCisgICAgICAgIFdlIG5lZWQgdG8gUHJlZmVyTnVtYmVyIHdoZW4gY2FsbGluZyB0b1By aW1pdGl2ZSBmb3IgbmVnYXRlCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3df YnVnLmNnaT9pZD0yMzI2NzkKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4K KworICAgICAgICAqIHN0cmVzcy9uZWdhdGUtcHJmZXItbnVtYmVyLXRvLXByaW1pdGl2ZS5qczog QWRkZWQuCisgICAgICAgIChhc3NlcnQpOgorICAgICAgICAobWFpbi4pOgorICAgICAgICAobWFp 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