switch the VRBaseMap in the scheduler from an std::map to a DenseMap. This
speeds up the isel pass from 2.5570s to 2.4722s on kc++ (3.4%).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33879 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
index 33227ad..d290d88 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
@@ -269,8 +269,8 @@
/// getVR - Return the virtual register corresponding to the specified result
/// of the specified node.
-static unsigned getVR(SDOperand Op, std::map<SDNode*, unsigned> &VRBaseMap) {
- std::map<SDNode*, unsigned>::iterator I = VRBaseMap.find(Op.Val);
+static unsigned getVR(SDOperand Op, DenseMap<SDNode*, unsigned> &VRBaseMap) {
+ DenseMap<SDNode*, unsigned>::iterator I = VRBaseMap.find(Op.Val);
assert(I != VRBaseMap.end() && "Node emitted out of order - late");
return I->second + Op.ResNo;
}
@@ -283,7 +283,7 @@
void ScheduleDAG::AddOperand(MachineInstr *MI, SDOperand Op,
unsigned IIOpNum,
const TargetInstrDescriptor *II,
- std::map<SDNode*, unsigned> &VRBaseMap) {
+ DenseMap<SDNode*, unsigned> &VRBaseMap) {
if (Op.isTargetOpcode()) {
// Note that this case is redundant with the final else block, but we
// include it because it is the most common and it makes the logic
@@ -371,7 +371,7 @@
/// EmitNode - Generate machine code for an node and needed dependencies.
///
void ScheduleDAG::EmitNode(SDNode *Node,
- std::map<SDNode*, unsigned> &VRBaseMap) {
+ DenseMap<SDNode*, unsigned> &VRBaseMap) {
unsigned VRBase = 0; // First virtual register for node
// If machine instruction
@@ -595,7 +595,7 @@
// Finally, emit the code for all of the scheduled instructions.
- std::map<SDNode*, unsigned> VRBaseMap;
+ DenseMap<SDNode*, unsigned> VRBaseMap;
for (unsigned i = 0, e = Sequence.size(); i != e; i++) {
if (SUnit *SU = Sequence[i]) {
for (unsigned j = 0, ee = SU->FlaggedNodes.size(); j != ee; j++)
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGSimple.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGSimple.cpp
index 442b8ef..e4133ce 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGSimple.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGSimple.cpp
@@ -682,7 +682,7 @@
LI->first, RegMap->getRegClass(LI->second));
}
- std::map<SDNode*, unsigned> VRBaseMap;
+ DenseMap<SDNode*, unsigned> VRBaseMap;
// For each node in the ordering
for (unsigned i = 0, N = Ordering.size(); i < N; i++) {