6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-08-17 21:29:20 +00:00
Code Issues Projects Releases Wiki Activity

Inhibit instructions from being pushed before function calls. This will

Browse Source 
minimize unnecessary spilling.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23710 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Laskey 2005-10-13 16:44:00 +00:00
parent e08fe8d7e5
commit 53c523c00e
1 changed files with 55 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
View File

@ -232,6 +232,7 @@ public:
SDNode *Node; // DAG node
unsigned Latency; // Cycles to complete instruction
unsigned ResourceSet; // Bit vector of usable resources
bool IsCall; // Is function call
unsigned Slot; // Node's time slot
NodeGroup *Group; // Grouping information
unsigned VRBase; // Virtual register base
@ -245,9 +246,13 @@ public:
, Node(N)
, Latency(0)
, ResourceSet(0)
, IsCall(false)
, Slot(0)
, Group(NULL)
, VRBase(0)
#ifndef NDEBUG
, Preorder(0)
#endif
{}
// Accessors
@ -375,6 +380,7 @@ private:
RSInteger = 0x3, // Two integer units
RSFloat = 0xC, // Two float units
RSLoadStore = 0x30, // Two load store units
RSBranch = 0x400, // One branch unit
RSOther = 0 // Processing unit independent
};
@ -663,12 +669,22 @@ void SimpleSched::IdentifyGroups() {
/// GatherSchedulingInfo - Get latency and resource information about each node.
///
void SimpleSched::GatherSchedulingInfo() {
// Track if groups are present
bool AreGroups = false;
// For each node
for (unsigned i = 0, N = NodeCount; i < N; i++) {
// Get node info
NodeInfo* NI = &Info[i];
SDNode *Node = NI->Node;
// Test for groups
if (NI->isInGroup()) AreGroups = true;
// FIXME: Pretend by using value type to choose metrics
MVT::ValueType VT = Node->getValueType(0);
// If machine opcode
if (Node->isTargetOpcode()) {
MachineOpCode TOpc = Node->getTargetOpcode();
// FIXME: This is an ugly (but temporary!) hack to test the scheduler
@ -676,8 +692,9 @@ void SimpleSched::GatherSchedulingInfo() {
// FIXME NI->Latency = std::max(1, TII.maxLatency(TOpc));
// FIXME NI->ResourceSet = TII.resources(TOpc);
if (TII.isCall(TOpc)) {
NI->ResourceSet = RSInteger;
NI->ResourceSet = RSBranch;
NI->Latency = 40;
NI->IsCall = true;
} else if (TII.isLoad(TOpc)) {
NI->ResourceSet = RSLoadStore;
NI->Latency = 5;
@ -713,6 +730,41 @@ void SimpleSched::GatherSchedulingInfo() {
// Sum up all the latencies for max tally size
NSlots += NI->Latency;
}
// Unify metrics if in a group
if (AreGroups) {
for (unsigned i = 0, N = NodeCount; i < N; i++) {
NodeInfo* NI = &Info[i];
if (NI->isGroupLeader()) {
NodeGroup *Group = NI->Group;
unsigned Latency = 0;
unsigned MaxLat = 0;
unsigned ResourceSet = 0;
bool IsCall = false;
for (NIIterator NGI = Group->begin(), NGE = Group->end();
NGI != NGE; NGI++) {
NodeInfo* NGNI = *NGI;
Latency += NGNI->Latency;
IsCall = IsCall || NGNI->IsCall;
if (MaxLat < NGNI->Latency) {
MaxLat = NGNI->Latency;
ResourceSet = NGNI->ResourceSet;
}
NGNI->Latency = 0;
NGNI->ResourceSet = 0;
NGNI->IsCall = false;
}
NI->Latency = Latency;
NI->ResourceSet = ResourceSet;
NI->IsCall = IsCall;
}
}
}
}
/// PrepareNodeInfo - Set up the basic minimum node info for scheduling.
@ -837,7 +889,7 @@ void SimpleSched::ScheduleForward() {
if (isStrongDependency(Other, NI)) {
Slot = Other->Slot + Other->Latency;
break;
} else if (isWeakDependency(Other, NI)) {
} else if (Other->IsCall || isWeakDependency(Other, NI)) {
Slot = Other->Slot;
break;
}
@ -1134,7 +1186,7 @@ void SimpleSched::printChanges(unsigned Index) {
NodeGroup *Group = NI->Group;
for (NIIterator NII = Group->begin(), E = Group->end();
NII != E; NII++) {
std::cerr << " ";
std::cerr << " ";
printSI(std::cerr, *NII);
std::cerr << "\n";
}