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Disable null pointer folding transforms for non-generic address spaces. This should probably be a target-specific predicate based on address space. That way for targets where this isn't applicable the predicate can be optimized away.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45403 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Christopher Lamb
2007-12-29 07:56:53 +00:00
parent b253a8b382
commit b15147ea4c
2 changed files with 12 additions and 4 deletions
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4
lib/Transforms/Scalar/SCCP.cpp
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@@ -1015,7 +1015,9 @@ void SCCPSolver::visitLoadInst(LoadInst &I) {
if (PtrVal.isUndefined()) return; // The pointer is not resolved yet!
if (PtrVal.isConstant() && !I.isVolatile()) {
Value *Ptr = PtrVal.getConstant();
if (isa<ConstantPointerNull>(Ptr)) {
// TODO: Consider a target hook for valid address spaces for this xform.
if (isa<ConstantPointerNull>(Ptr) &&
cast<PointerType>(Ptr->getType())->getAddressSpace() == 0) {
// load null -> null
markConstant(IV, &I, Constant::getNullValue(I.getType()));
return;