Reuse live interval union between functions. This saves a bit of compile time
when compiling many small functions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129321 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalUnion.h b/lib/CodeGen/LiveIntervalUnion.h
index 90d4aaf..c83578e 100644
--- a/lib/CodeGen/LiveIntervalUnion.h
+++ b/lib/CodeGen/LiveIntervalUnion.h
@@ -95,6 +95,9 @@
// Remove a live virtual register's segments from this union.
void extract(LiveInterval &VirtReg);
+ // Remove all inserted virtual registers.
+ void clear() { Segments.clear(); ++Tag; }
+
// Print union, using TRI to translate register names
void print(raw_ostream &OS, const TargetRegisterInfo *TRI) const;
diff --git a/lib/CodeGen/RegAllocBasic.cpp b/lib/CodeGen/RegAllocBasic.cpp
index 708f556..af7da53 100644
--- a/lib/CodeGen/RegAllocBasic.cpp
+++ b/lib/CodeGen/RegAllocBasic.cpp
@@ -235,9 +235,12 @@
MRI = &vrm.getRegInfo();
VRM = &vrm;
LIS = &lis;
- PhysReg2LiveUnion.init(UnionAllocator, TRI->getNumRegs());
- // Cache an interferece query for each physical reg
- Queries.reset(new LiveIntervalUnion::Query[PhysReg2LiveUnion.numRegs()]);
+ const unsigned NumRegs = TRI->getNumRegs();
+ if (NumRegs != PhysReg2LiveUnion.numRegs()) {
+ PhysReg2LiveUnion.init(UnionAllocator, NumRegs);
+ // Cache an interferece query for each physical reg
+ Queries.reset(new LiveIntervalUnion::Query[PhysReg2LiveUnion.numRegs()]);
+ }
}
void RegAllocBase::LiveUnionArray::clear() {
@@ -251,7 +254,8 @@
}
void RegAllocBase::releaseMemory() {
- PhysReg2LiveUnion.clear();
+ for (unsigned r = 0, e = PhysReg2LiveUnion.numRegs(); r != e; ++r)
+ PhysReg2LiveUnion[r].clear();
}
// Visit all the live registers. If they are already assigned to a physical