mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-20 03:23:01 +02:00
misched: Allow disabling scoreboard hazard checking for subtargets with a
valid itinerary but no pipeline stages. An itinerary can contain useful scheduling information without specifying pipeline stages for each instruction. llvm-svn: 157977
This commit is contained in:
parent
8b333df134
commit
85bf12c584
@ -46,6 +46,8 @@ public:
|
||||
|
||||
/// atIssueLimit - Return true if no more instructions may be issued in this
|
||||
/// cycle.
|
||||
///
|
||||
/// FIXME: remove this once MachineScheduler is the only client.
|
||||
virtual bool atIssueLimit() const { return false; }
|
||||
|
||||
/// getHazardType - Return the hazard type of emitting this node. There are
|
||||
|
@ -39,9 +39,9 @@ ScoreboardHazardRecognizer(const InstrItineraryData *II,
|
||||
DebugType = ParentDebugType;
|
||||
#endif
|
||||
|
||||
// Determine the maximum depth of any itinerary. This determines the
|
||||
// depth of the scoreboard. We always make the scoreboard at least 1
|
||||
// cycle deep to avoid dealing with the boundary condition.
|
||||
// Determine the maximum depth of any itinerary. This determines the depth of
|
||||
// the scoreboard. We always make the scoreboard at least 1 cycle deep to
|
||||
// avoid dealing with the boundary condition.
|
||||
unsigned ScoreboardDepth = 1;
|
||||
if (ItinData && !ItinData->isEmpty()) {
|
||||
IssueWidth = ItinData->IssueWidth;
|
||||
@ -63,16 +63,22 @@ ScoreboardHazardRecognizer(const InstrItineraryData *II,
|
||||
// Find the next power-of-2 >= ItinDepth
|
||||
while (ItinDepth > ScoreboardDepth) {
|
||||
ScoreboardDepth *= 2;
|
||||
// Don't set MaxLookAhead until we find at least one nonzero stage.
|
||||
// This way, an itinerary with no stages has MaxLookAhead==0, which
|
||||
// completely bypasses the scoreboard hazard logic.
|
||||
MaxLookAhead = ScoreboardDepth;
|
||||
}
|
||||
}
|
||||
MaxLookAhead = ScoreboardDepth;
|
||||
}
|
||||
|
||||
ReservedScoreboard.reset(ScoreboardDepth);
|
||||
RequiredScoreboard.reset(ScoreboardDepth);
|
||||
|
||||
DEBUG(dbgs() << "Using scoreboard hazard recognizer: Depth = "
|
||||
<< ScoreboardDepth << '\n');
|
||||
if (!MaxLookAhead)
|
||||
DEBUG(dbgs() << "Disabled scoreboard hazard recognizer\n");
|
||||
else
|
||||
DEBUG(dbgs() << "Using scoreboard hazard recognizer: Depth = "
|
||||
<< ScoreboardDepth << '\n');
|
||||
}
|
||||
|
||||
void ScoreboardHazardRecognizer::Reset() {
|
||||
|
Loading…
Reference in New Issue
Block a user