https://bugs.llvm.org/show_bug.cgi?id=46056
Bug ID: 46056
Summary: [SCEV] Missing Or expression handling
Product: libraries
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: elena.demikhov...@intel.com
CC: llvm-bugs@lists.llvm.org
The SCEV builder does not handle all cases of Or expression. Diring the
"instcombine" phase an Add instruction may be replaced with Or if there is no
common bits between two addends. When we try to create a SCEV expression, the
Or is not parsed as Add and we have SCEVUnknown on Or expression.
I suppose that we need to add something like this:
ScalarEvolution.cpp
in function
const SCEV *ScalarEvolution::createSCEV(Value *V)
..
case Instruction::Or:
..
else if (llvm::haveNoCommonBitsSet(BO->RHS, BO->LHS, getDataLayout()))
return getAddExpr(getSCEV(BO->LHS), getSCEV(BO->RHS));
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