Title: [276537] branches/safari-611.1.21.161-branch/Source/_javascript_Core
- Revision
- 276537
- Author
- [email protected]
- Date
- 2021-04-23 17:21:10 -0700 (Fri, 23 Apr 2021)
Log Message
Cherry-pick r276524. rdar://problem/77092702
Fix B3 strength reduction for shl.
https://bugs.webkit.org/show_bug.cgi?id=224913
rdar://76978874
Reviewed by Michael Saboff.
If the operation can potentially either underflow or overflow, then the result
can be any value.
* b3/B3ReduceStrength.cpp:
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@276524 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Modified Paths
Diff
Modified: branches/safari-611.1.21.161-branch/Source/_javascript_Core/ChangeLog (276536 => 276537)
--- branches/safari-611.1.21.161-branch/Source/_javascript_Core/ChangeLog 2021-04-24 00:18:32 UTC (rev 276536)
+++ branches/safari-611.1.21.161-branch/Source/_javascript_Core/ChangeLog 2021-04-24 00:21:10 UTC (rev 276537)
@@ -1,3 +1,35 @@
+2021-04-23 Alan Coon <[email protected]>
+
+ Cherry-pick r276524. rdar://problem/77092702
+
+ Fix B3 strength reduction for shl.
+ https://bugs.webkit.org/show_bug.cgi?id=224913
+ rdar://76978874
+
+ Reviewed by Michael Saboff.
+
+ If the operation can potentially either underflow or overflow, then the result
+ can be any value.
+
+ * b3/B3ReduceStrength.cpp:
+
+
+
+ git-svn-id: https://svn.webkit.org/repository/webkit/trunk@276524 268f45cc-cd09-0410-ab3c-d52691b4dbfc
+
+ 2021-04-23 Mark Lam <[email protected]>
+
+ Fix B3 strength reduction for shl.
+ https://bugs.webkit.org/show_bug.cgi?id=224913
+ rdar://76978874
+
+ Reviewed by Michael Saboff.
+
+ If the operation can potentially either underflow or overflow, then the result
+ can be any value.
+
+ * b3/B3ReduceStrength.cpp:
+
2021-02-17 Ruben Turcios <[email protected]>
Cherry-pick r271767. rdar://problem/74409412
Modified: branches/safari-611.1.21.161-branch/Source/_javascript_Core/b3/B3ReduceStrength.cpp (276536 => 276537)
--- branches/safari-611.1.21.161-branch/Source/_javascript_Core/b3/B3ReduceStrength.cpp 2021-04-24 00:18:32 UTC (rev 276536)
+++ branches/safari-611.1.21.161-branch/Source/_javascript_Core/b3/B3ReduceStrength.cpp 2021-04-24 00:21:10 UTC (rev 276537)
@@ -240,10 +240,11 @@
T newMin = static_cast<T>(m_min) << static_cast<T>(shiftAmount);
T newMax = static_cast<T>(m_max) << static_cast<T>(shiftAmount);
- if ((newMin >> shiftAmount) != static_cast<T>(m_min))
+ if (((newMin >> shiftAmount) != static_cast<T>(m_min))
+ || ((newMax >> shiftAmount) != static_cast<T>(m_max))) {
newMin = std::numeric_limits<T>::min();
- if ((newMax >> shiftAmount) != static_cast<T>(m_max))
newMax = std::numeric_limits<T>::max();
+ }
return IntRange(newMin, newMax);
}
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