[llvm-bugs] [Bug 25879] New: Incorrect schedule is generated
llvm-bugs at lists.llvm.org
Fri Dec 18 02:26:16 PST 2015
Bug ID: 25879
Summary: Incorrect schedule is generated
Assignee: polly-dev at googlegroups.com
Reporter: doerfert at cs.uni-saarland.de
CC: llvm-bugs at lists.llvm.org
Created attachment 15482
The Schedule generation relies on a reverse post order traversal as the domain
generation does. Though, for the former this is not the right choice as it does
not guarantee loops are visited completely after the header was visited.
Instead, blocks after the loop can be visited first causing them to appear
prior in the schedule than they should. An example test case is attached.
This bug was detected due to a SSA-Codegen failure in an lnt benchmark. It does
apperently not cause a result change for the current code generation, even
though we basically load/use an uninitialized value...
I am working on a patch for the schedule generation but ideas are welcome.
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