https://llvm.org/bugs/show_bug.cgi?id=31357
Bug ID: 31357
Summary: DAGCombiner::MatchBswapHword logic is wrong for OR
trees
Product: new-bugs
Version: trunk
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: jle...@knupath.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 17750
--> https://llvm.org/bugs/attachment.cgi?id=17750&action=edit
Fix to DAGCombiner.cpp and two new unit test files
The existing code only looks at half of the tree when matching bswap + rol
patterns ending in an OR tree (as opposed to a cascade).
Proposed patch with test coverage is attached
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