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Revert 80959. It isn't sufficient to solve the full problem. And it

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introduced regressions in the Ocaml bindings tests.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80969 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-09-03 23:34:49 +00:00
parent b405bbe664
commit 6e7ad95868
9 changed files with 92 additions and 22 deletions
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18
lib/Analysis/ConstantFolding.cpp
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@@ -203,21 +203,15 @@ static Constant *SymbolicallyEvaluateGEP(Constant* const* Ops, unsigned NumOps,
if (Offset != 0)
return 0;
// Create the GEP constant expr.
Constant *C = ConstantExpr::getGetElementPtr(Ptr,
&NewIdxs[0], NewIdxs.size());
assert(cast<PointerType>(C->getType())->getElementType() == Ty &&
"Computed GetElementPtr has unexpected type!");
// If the base is the start of a GlobalVariable and all the array indices
// remain in their static bounds, the GEP is inbounds. We can check that
// all indices are in bounds by just checking the first index only
// because we've just normalized all the indices. We can mutate the
// Constant in place because we've proven that the indices are in bounds,
// so they'll always be in bounds.
if (isa<GlobalVariable>(Ptr) && NewIdxs[0]->isNullValue())
if (GEPOperator *GEP = dyn_cast<GEPOperator>(C))
GEP->setIsInBounds(true);
// because we've just normalized all the indices.
Constant *C = isa<GlobalVariable>(Ptr) && NewIdxs[0]->isNullValue() ?
ConstantExpr::getInBoundsGetElementPtr(Ptr, &NewIdxs[0], NewIdxs.size()) :
ConstantExpr::getGetElementPtr(Ptr, &NewIdxs[0], NewIdxs.size());
assert(cast<PointerType>(C->getType())->getElementType() == Ty &&
"Computed GetElementPtr has unexpected type!");
// If we ended up indexing a member with a type that doesn't match
// the type of what the original indices indexed, add a cast.