1 files changed, 63 insertions, 0 deletions
diff --git a/depends/patches/qt/fix_qpainter_non_determinism.patch b/depends/patches/qt/fix_qpainter_non_determinism.patch
new file mode 100644
index 0000000000..3cfcc22f03
--- /dev/null
+++ b/depends/patches/qt/fix_qpainter_non_determinism.patch
@@ -0,0 +1,63 @@
+commit 2a8f7dc6ddfc414a66491522501c1574a1343ee1
+Author: Andrew Chow <achow101-github@achow101.com>
+Date:   Sat Nov 21 01:11:04 2020 -0500
+
+    build: Fix determinism issue when building with Clang 8
+
+    When building Qt with LLVM/Clang 8 under -O3 (the default), we run into
+    a determinism issue in `qt_interset_spans`. The issue has been fixed for
+    LLVM/Clang 9, see
+    https://github.com/llvm/llvm-project/commit/db101864bdc938deb1d63fe4f7da761bd38e5cae
+    and https://reviews.llvm.org/D64601, however this fix was not backported
+    to 8.x. Once LLVM/Clang 9 is used, this patch can be dropped.
+
+    The particular issue appears to be an optimization done by -O3 which
+    adds a temporary variable for `spans->y` in `qt_intersect_spans`. When
+    it does this, sometimes it chooses to use a 32-bit movs instruction
+    (movswl), and other times it chooses a 64-bit movs instruction (movswq).
+    By patching `qt_intersect_spans` to always make a temporary variable for
+    `spans->y`, we are able to sidestep this problem.
+
+diff --git a/qtbase/src/gui/painting/qpaintengine_raster.cpp b/qtbase/src/gui/painting/qpaintengine_raster.cpp
+index 92ab6e8375..f018009e0b 100644
+--- a/qtbase/src/gui/painting/qpaintengine_raster.cpp
++++ b/qtbase/src/gui/painting/qpaintengine_raster.cpp
+@@ -3971,22 +3971,23 @@ static const QSpan *qt_intersect_spans(const QClipData *clip, int *currentClip,
+     const QSpan *clipEnd = clip->m_spans + clip->count;
+ 
+     while (available && spans < end ) {
++        const short spans_y = spans->y;
+         if (clipSpans >= clipEnd) {
+             spans = end;
+             break;
+         }
+-        if (clipSpans->y > spans->y) {
++        if (clipSpans->y > spans_y) {
+             ++spans;
+             continue;
+         }
+-        if (spans->y != clipSpans->y) {
+-            if (spans->y < clip->count && clip->m_clipLines[spans->y].spans)
+-                clipSpans = clip->m_clipLines[spans->y].spans;
++        if (spans_y != clipSpans->y) {
++            if (spans_y < clip->count && clip->m_clipLines[spans_y].spans)
++                clipSpans = clip->m_clipLines[spans_y].spans;
+             else
+                 ++clipSpans;
+             continue;
+         }
+-        Q_ASSERT(spans->y == clipSpans->y);
++        Q_ASSERT(spans_y == clipSpans->y);
+ 
+         int sx1 = spans->x;
+         int sx2 = sx1 + spans->len;
+@@ -4005,7 +4006,7 @@ static const QSpan *qt_intersect_spans(const QClipData *clip, int *currentClip,
+         if (len) {
+             out->x = qMax(sx1, cx1);
+             out->len = qMin(sx2, cx2) - out->x;
+-            out->y = spans->y;
++            out->y = spans_y;
+             out->coverage = qt_div_255(spans->coverage * clipSpans->coverage);
+             ++out;
+             --available;
+