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Commit Graph

Author	SHA1	Message	Date
Andrew Chow	8f7d1b39ef	Fix QPainter non-determinism on macOS Aplies a patch to Qt that fixes the non-determinism by modifying Qt. The source of the non-determinism is how LLVM 8 optimizes qt_intersect_spans when compiling. The particular optimization that seems to be causing the problems is that a temp variable is being added for spans->y. For some reason, when it does this, it chooses different instructions to use when making that variable. We bypass this problem by patching qt_intersect_spans to always make and use this local variable.	4 years ago

Author

SHA1

Message

Date

Andrew Chow

8f7d1b39ef

Fix QPainter non-determinism on macOS

Aplies a patch to Qt that fixes the non-determinism by modifying Qt. The
source of the non-determinism is how LLVM 8 optimizes qt_intersect_spans
when compiling. The particular optimization that seems to be causing the
problems is that a temp variable is being added for spans->y. For some
reason, when it does this, it chooses different instructions to use when
making that variable. We bypass this problem by patching
qt_intersect_spans to always make and use this local variable.

1 Commits (3272e34f9c548f7e4570d786fd322947e3cf20c6)