mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-19 19:29:31 +00:00
Fix a case where the DAG Combiner would accidentally CSE flag-producing nodes,
creating graphs that cannot be scheduled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24866 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
241116fbad
commit
9f8cc69009
@ -389,9 +389,14 @@ SDNode *SelectionDAG::AddNonLeafNodeToCSEMaps(SDNode *N) {
|
||||
assert(N->getNumOperands() && "This is a leaf node!");
|
||||
if (N->getOpcode() == ISD::CALLSEQ_START ||
|
||||
N->getOpcode() == ISD::CALLSEQ_END ||
|
||||
N->getOpcode() == ISD::HANDLENODE)
|
||||
N->getOpcode() == ISD::HANDLENODE || N->getValueType(0) == MVT::Flag)
|
||||
return 0; // Never add these nodes.
|
||||
|
||||
// Check that remaining values produced are not flags.
|
||||
for (unsigned i = 1, e = N->getNumValues(); i != e; ++i)
|
||||
if (N->getValueType(i) == MVT::Flag)
|
||||
return 0; // Never CSE anything that produces a flag.
|
||||
|
||||
if (N->getNumValues() == 1) {
|
||||
if (N->getNumOperands() == 1) {
|
||||
SDNode *&U = UnaryOps[std::make_pair(N->getOpcode(),
|
||||
|
Loading…
Reference in New Issue
Block a user