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| author | fanquake <fanquake@gmail.com> | 2020-11-25 09:50:27 +0800 |
|---|---|---|
| committer | fanquake <fanquake@gmail.com> | 2020-11-25 10:07:28 +0800 |
| commit | 17294c1820396791f436e659432c5d0a976c6554 (patch) | |
| tree | 2a4783c46818076d2f7e1c93ea8cd2b0507ce9a0 /configure.ac | |
| parent | 3fae2f95f14d285c792e03d9f0995c449a1cc758 (diff) | |
| parent | ab23a83400d5ad13137ce0f9697a51f0b70e9d29 (diff) | |
Merge #20479: Fix QPainter non-determinism on macOS (0.21 backport)
ab23a83400d5ad13137ce0f9697a51f0b70e9d29 Fix QPainter non-determinism on macOS (Andrew Chow)
Pull request description:
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.
Github-Pull: #20447
Rebased-From: 8f7d1b39efbe65ab2747c593cc3560d4a449a333
Tree-SHA512: 558da5c2bb0373e2a89f2c219170f802036e0e87cc8e808336b23d074152cb893007a440f46ec957156b0921355cd18502710f2d224f27bc26e934c50ebebc41
ACKs for top commit:
jonasschnelli:
codereview ACK ab23a83400d5ad13137ce0f9697a51f0b70e9d29
achow101:
ACK ab23a83400d5ad13137ce0f9697a51f0b70e9d29
Tree-SHA512: 10991fe2b5452b1393678c315281cfdca011e9bb2cd8094a002746e690890ace148ac2dbf39c5fbe5e7f4cd39eeebfa0a715c065cff150cf70e9733cb0ff32d6
Diffstat (limited to 'configure.ac')
0 files changed, 0 insertions, 0 deletions