Simple JS has differing results on AMD64/i386
Bug #1312571 reported by
Alan Pope 🍺🐧🐱 🦄
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| qtdeclarative-opensource-src (Ubuntu) |
Fix Released
|
Undecided
|
Timo Jyrinki | ||
Bug Description
Reporting on behalf of mrqtros who filed this upstream.
function safeAdd(x, y)
{ var lsw = (x & 0xFFFF) + (y & 0xFFFF); var msw = (x >> 16) + (y >> 16) + (lsw >> 16); // console.log("res", "(msw << 16) | (lsw & 0xFFFF)") return ((msw << 16) | (lsw & 0xFFFF)); }
This code reports different results depending on the architecture it's run on.
Tested on amd64 and i386 on Ubuntu 14.04 - so 5.2.1.
On amd64 I get -2124464854 with and without console.log()
On i386 I get -2124464854 or 45890858 as per Roman's comment in qt bug https:/
However on i386 if I set QV4_NO_REGALLOC=1 then it's always -2124464854
Please can the upstream fix at https:/
Related branches
lp:~timo-jyrinki/kubuntu-packaging/qtdeclarative-for-u-series-multiple-fixes
- PS Jenkins bot: Approve (continuous-integration)
- Kubuntu Packagers: Pending requested
-
Diff: 931 lines (+684/-29)13 files modifieddebian/changelog (+50/-0)
debian/control (+156/-26)
debian/copyright (+20/-0)
debian/libqt5qml5.symbols (+2/-1)
debian/mark_private_symbols.sh (+20/-0)
debian/patches/Fix-marking-of-prototype-objects-in-chain.patch (+89/-0)
debian/patches/Implement-proper-support-for-layoutChange-in-QQmlDel.patch (+158/-0)
debian/patches/QQuickItemView-QQuickPathView-Fix-creation-of-delega.patch (+128/-0)
debian/patches/V4-regalloc-fix-register-spill-choice-under-high-pre.patch (+50/-0)
debian/patches/series (+4/-0)
debian/qml-module-qtquick-dialogs.install (+5/-1)
debian/qml-module-qtquick-dialogs.lintian-overrides (+1/-1)
debian/source/lintian-overrides (+1/-0)
| Changed in qtdeclarative-opensource-src (Ubuntu): | |
| assignee: | nobody → Timo Jyrinki (timo-jyrinki) |
| status: | New → In Progress |
Revision history for this message
| Launchpad Janitor (janitor) wrote | #1 |
| Changed in qtdeclarative-opensource-src (Ubuntu): | |
| status: | In Progress → Fix Released |
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This bug was fixed in the package qtdeclarative-
---------------
qtdeclarative-
* Resync with Debian including renamed QML packages (LP: #1313547)
* Depend conditionally on libgl1 (LP: #1278871)
* debian/
- Fix a crasher with deleted QQmlCompiledData as suggested by upstream
(LP: #1304248)
* debian/
- Fix "Carousel doesn't re-render properly after scrolling"
(LP: #1307578)
* debian/
- Fix a performance hit when editing sorted lists (LP: #1303746)
* debian/
- Fix differing JS results on AMD64/i386 (LP: #1312571)
* Updated symbols
-- Timo Jyrinki <email address hidden> Mon, 28 Apr 2014 07:35:22 +0000