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Handle reference counts in one function: release().

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This new function will decrement the reference count, and collapse a
domain value when the last reference is gone.

This simplifies DomainValue reference counting, and decouples it from
the LiveRegs array.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144131 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-11-08 21:57:44 +00:00
parent 74d8a87f40
commit 35e932483a
1 changed files with 18 additions and 15 deletions
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33
lib/CodeGen/ExecutionDepsFix.cpp
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@ -139,7 +139,7 @@ private:
// DomainValue allocation.
DomainValue *Alloc(int domain = -1);
void Recycle(DomainValue*);
void release(DomainValue*);
// LiveRegs manipulations.
void SetLiveReg(int rx, DomainValue *DV);
@ -176,10 +176,19 @@ DomainValue *ExeDepsFix::Alloc(int domain) {
return dv;
}
void ExeDepsFix::Recycle(DomainValue *dv) {
assert(dv && "Cannot recycle NULL");
dv->clear();
Avail.push_back(dv);
/// release - Release a reference to DV. When the last reference is released,
/// collapse if needed.
void ExeDepsFix::release(DomainValue *DV) {
assert(DV && DV->Refs && "Bad DomainValue");
if (--DV->Refs)
return;
// There are no more DV references. Collapse any contained instructions.
if (DV->AvailableDomains && !DV->isCollapsed())
Collapse(DV, DV->getFirstDomain());
DV->clear();
Avail.push_back(DV);
}
/// Set LiveRegs[rx] = dv, updating reference counts.
@ -192,10 +201,8 @@ void ExeDepsFix::SetLiveReg(int rx, DomainValue *dv) {
if (LiveRegs[rx] == dv)
return;
if (LiveRegs[rx]) {
assert(LiveRegs[rx]->Refs && "Bad refcount");
if (--LiveRegs[rx]->Refs == 0) Recycle(LiveRegs[rx]);
}
if (LiveRegs[rx])
release(LiveRegs[rx]);
LiveRegs[rx] = dv;
if (dv) ++dv->Refs;
}
@ -205,12 +212,8 @@ void ExeDepsFix::Kill(int rx) {
assert(unsigned(rx) < NumRegs && "Invalid index");
if (!LiveRegs || !LiveRegs[rx]) return;
// Before killing the last reference to an open DomainValue, collapse it to
// the first available domain.
if (LiveRegs[rx]->Refs == 1 && !LiveRegs[rx]->isCollapsed())
Collapse(LiveRegs[rx], LiveRegs[rx]->getFirstDomain());
else
SetLiveReg(rx, 0);
release(LiveRegs[rx]);
LiveRegs[rx] = 0;
}
/// Force register rx into domain.