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In SCEVAddExpr::get, skip over any cast operands before looking for nested 

add operands after constant operands. The recent change to recognize
sign-extend expressions caused this to be exposed more often.

llvm-svn: 37628
This commit is contained in:
Dan Gohman 2007-06-18 19:30:09 +00:00
parent 02b0997b28
commit eed125f315
1 changed files with 5 additions and 2 deletions
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7
llvm/lib/Analysis/ScalarEvolution.cpp
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@ -685,8 +685,11 @@ SCEVHandle SCEVAddExpr::get(std::vector<SCEVHandle> &Ops) {
return SCEVAddExpr::get(Ops); return SCEVAddExpr::get(Ops);
} }
// Okay, now we know the first non-constant operand. If there are add // Now we know the first non-constant operand. Skip past any cast SCEVs.
// operands they would be next. while (Idx < Ops.size() && Ops[Idx]->getSCEVType() < scAddExpr)
++Idx;
// If there are add operands they would be next.
if (Idx < Ops.size()) { if (Idx < Ops.size()) {
bool DeletedAdd = false; bool DeletedAdd = false;
while (SCEVAddExpr *Add = dyn_cast<SCEVAddExpr>(Ops[Idx])) { while (SCEVAddExpr *Add = dyn_cast<SCEVAddExpr>(Ops[Idx])) {