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[Packetizer] Add debugging code to stop packetization after N instructions

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279325 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Krzysztof Parzyszek 2016-08-19 21:12:52 +00:00
parent 48a33fd8e5
commit 61926b476d
1 changed files with 21 additions and 0 deletions
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21
lib/CodeGen/DFAPacketizer.cpp
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@ -31,9 +31,14 @@
#include "llvm/CodeGen/ScheduleDAGInstrs.h"
#include "llvm/MC/MCInstrItineraries.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
static cl::opt<unsigned> InstrLimit("dfa-instr-limit", cl::Hidden,
cl::init(0), cl::desc("If present, stops packetizing after N instructions"));
static unsigned InstrCount = 0;
// --------------------------------------------------------------------
// Definitions shared between DFAPacketizer.cpp and DFAPacketizerEmitter.cpp
@ -218,6 +223,13 @@ VLIWPacketizerList::~VLIWPacketizerList() {
// End the current packet, bundle packet instructions and reset DFA state.
void VLIWPacketizerList::endPacket(MachineBasicBlock *MBB,
MachineBasicBlock::iterator MI) {
DEBUG({
if (!CurrentPacketMIs.empty()) {
dbgs() << "Finalizing packet:\n";
for (MachineInstr *MI : CurrentPacketMIs)
dbgs() << " * " << *MI;
}
});
if (CurrentPacketMIs.size() > 1) {
MachineInstr &MIFirst = *CurrentPacketMIs.front();
finalizeBundle(*MBB, MIFirst.getIterator(), MI.getInstrIterator());
@ -249,8 +261,17 @@ void VLIWPacketizerList::PacketizeMIs(MachineBasicBlock *MBB,
for (SUnit &SU : VLIWScheduler->SUnits)
MIToSUnit[SU.getInstr()] = &SU;
bool LimitPresent = InstrLimit.getPosition();
// The main packetizer loop.
for (; BeginItr != EndItr; ++BeginItr) {
if (LimitPresent) {
if (InstrCount >= InstrLimit) {
EndItr = BeginItr;
break;
}
InstrCount++;
}
MachineInstr &MI = *BeginItr;
initPacketizerState();