Add a new optimization pass: Stack Coloring, that merges disjoint static allocations (allocas). Allocas are known to be
disjoint if they are marked by disjoint lifetime markers (@llvm.lifetime.XXX intrinsics).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163299 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 1f5f825..7542941 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -1801,10 +1801,13 @@
User->getOpcode() == ISD::HANDLENODE) // Root of the graph.
continue;
- if (User->getOpcode() == ISD::CopyToReg ||
- User->getOpcode() == ISD::CopyFromReg ||
- User->getOpcode() == ISD::INLINEASM ||
- User->getOpcode() == ISD::EH_LABEL) {
+ unsigned UserOpcode = User->getOpcode();
+ if (UserOpcode == ISD::CopyToReg ||
+ UserOpcode == ISD::CopyFromReg ||
+ UserOpcode == ISD::INLINEASM ||
+ UserOpcode == ISD::EH_LABEL ||
+ UserOpcode == ISD::LIFETIME_START ||
+ UserOpcode == ISD::LIFETIME_END) {
// If their node ID got reset to -1 then they've already been selected.
// Treat them like a MachineOpcode.
if (User->getNodeId() == -1)
@@ -2220,6 +2223,8 @@
case ISD::CopyFromReg:
case ISD::CopyToReg:
case ISD::EH_LABEL:
+ case ISD::LIFETIME_START:
+ case ISD::LIFETIME_END:
NodeToMatch->setNodeId(-1); // Mark selected.
return 0;
case ISD::AssertSext: