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[Packetizer] Add a check whether an instruction should be packetized now

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Add a function VLIWPacketizerList::shouldAddToPacket, which will allow
specific implementations to decide if it is profitable to add given
instruction to the current packet.

llvm-svn: 255780
This commit is contained in:
Krzysztof Parzyszek 2015-12-16 16:38:16 +00:00
parent 110b342ed8
commit 063469eb6a
2 changed files with 13 additions and 2 deletions
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10
include/llvm/CodeGen/DFAPacketizer.h
View File

@ -186,6 +186,16 @@ public:
return true;
}
// Check if the packetizer should try to add the given instruction to
// the current packet. One reasons for which it may not be desirable
// to include an instruction in the current packet could be that it
// would cause a stall.
// If this function returns "false", the current packet will be ended,
// and the instruction will be added to the next packet.
virtual bool shouldAddToPacket(const MachineInstr *MI) {
return true;
}
// isLegalToPacketizeTogether - Is it legal to packetize SUI and SUJ
// together.
virtual bool isLegalToPacketizeTogether(SUnit *SUI, SUnit *SUJ) {

5
lib/CodeGen/DFAPacketizer.cpp
View File

@ -239,7 +239,7 @@ void VLIWPacketizerList::PacketizeMIs(MachineBasicBlock *MBB,
// Ask DFA if machine resource is available for MI.
bool ResourceAvail = ResourceTracker->canReserveResources(MI);
if (ResourceAvail) {
if (ResourceAvail && shouldAddToPacket(MI)) {
// Dependency check for MI with instructions in CurrentPacketMIs.
for (std::vector<MachineInstr*>::iterator VI = CurrentPacketMIs.begin(),
VE = CurrentPacketMIs.end(); VI != VE; ++VI) {
@ -258,7 +258,8 @@ void VLIWPacketizerList::PacketizeMIs(MachineBasicBlock *MBB,
} // !isLegalToPacketizeTogether.
} // For all instructions in CurrentPacketMIs.
} else {
// End the packet if resource is not available.
// End the packet if resource is not available, or if the instruction
// shoud not be added to the current packet.
endPacket(MBB, MI);
}