https://bugs.llvm.org/show_bug.cgi?id=51817
Bug ID: 51817
Summary: [SCEV] Violation of proposed definitional flag rules
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
This bug exists to track known violations of the proposed nowrap flag semantics
for SCEV in https://reviews.llvm.org/D109553. If that proposal is accepted,
this becomes a punch list. If it isn't, it will be closed as invalid.
Issues known at time of filing
* When folding loop invariant terms into an AddRec's start (in getAddExpr), we
propagate flag valid in the defining scope of the AddRec outside of it. This
is D106852.
* In applyLoopGuards, we apply contextual flags when reasoning about the
replacement given a urem expression. Removing this causes no test diffs.
* In getGEPExpr, we blindly copy flags from the IR gep (if inbounds) to the
corresponding MulExprs and AddExpr. This creates a set of SCEVs with
non-definitional flags. As noted in the fixme, we should be using similar
logic to AddRecNeverPoison here.
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