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Coalesce debug locations when possible, causing less DBG_VALUE instructions to

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be emitted.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120845 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-12-03 22:25:07 +00:00
parent 07c21d85b4
commit 5daec2215b
1 changed files with 34 additions and 2 deletions
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36
lib/CodeGen/LiveDebugVariables.cpp
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@ -188,6 +188,11 @@ class UserValue {
/// Map of slot indices where this value is live.
LocMap locInts;
/// coalesceLocation - After LocNo was changed, check if it has become
/// identical to another location, and coalesce them. This may cause LocNo or
/// a later location to be erased, but no earlier location will be erased.
void coalesceLocation(unsigned LocNo);
/// insertDebugValue - Insert a DBG_VALUE into MBB at Idx for LocNo.
void insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx, unsigned LocNo,
LiveIntervals &LIS, const TargetInstrInfo &TII);
@ -409,6 +414,30 @@ void LDVImpl::print(raw_ostream &OS) {
userValues[i]->print(OS, TRI);
}
void UserValue::coalesceLocation(unsigned LocNo) {
unsigned KeepLoc = std::find(locations.begin(), locations.begin() + LocNo,
locations[LocNo]) - locations.begin();
unsigned EraseLoc = LocNo;
if (KeepLoc == LocNo) {
EraseLoc = std::find(locations.begin() + LocNo + 1, locations.end(),
locations[LocNo]) - locations.begin();
// No matches.
if (EraseLoc == locations.size())
return;
}
assert(KeepLoc < EraseLoc);
locations.erase(locations.begin() + EraseLoc);
// Rewrite values.
for (LocMap::iterator I = locInts.begin(); I.valid(); ++I) {
unsigned v = I.value();
if (v == EraseLoc)
I.setValue(KeepLoc); // Coalesce when possible.
else if (v > EraseLoc)
I.setValueUnchecked(v-1); // Avoid coalescing with untransformed values.
}
}
UserValue *LDVImpl::getUserValue(const MDNode *Var, unsigned Offset) {
UserValue *&Leader = userVarMap[Var];
if (Leader) {
@ -613,13 +642,15 @@ LiveDebugVariables::~LiveDebugVariables() {
void UserValue::
renameRegister(unsigned OldReg, unsigned NewReg, unsigned SubIdx,
const TargetRegisterInfo *TRI) {
for (unsigned i = 0, e = locations.size(); i != e; ++i) {
Location &Loc = locations[i];
for (unsigned i = locations.size(); i; --i) {
unsigned LocNo = i - 1;
Location &Loc = locations[LocNo];
if (Loc.Kind != OldReg)
continue;
Loc.Kind = NewReg;
if (SubIdx && Loc.Data.SubIdx)
Loc.Data.SubIdx = TRI->composeSubRegIndices(SubIdx, Loc.Data.SubIdx);
coalesceLocation(LocNo);
}
}
@ -668,6 +699,7 @@ UserValue::rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI) {
} else {
Loc.Kind = Location::locUndef;
}
coalesceLocation(LocNo);
}
DEBUG(print(dbgs(), &TRI));
}