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Recover most of the compile time regression due to recent live interval changes.

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1. Eliminate the costly live interval "swapping".
2. Change ValueNumberInfo container from SmallVector to std::vector. The former
   performs slowly when the vector size is very large.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41536 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-08-28 08:28:51 +00:00
parent 51195af45f
commit 1a66f0a4f2
4 changed files with 100 additions and 98 deletions
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46
lib/CodeGen/LiveInterval.cpp
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@@ -288,25 +288,12 @@ LiveInterval::FindLiveRangeContaining(unsigned Idx) {
void LiveInterval::join(LiveInterval &Other, int *LHSValNoAssignments,
int *RHSValNoAssignments,
SmallVector<VNInfo, 16> &NewValueNumberInfo) {
// Try to do the least amount of work possible. In particular, if there are
// more liverange chunks in the other set than there are in the 'this' set,
// swap sets to merge the fewest chunks in possible.
//
// Also, if one range is a physreg and one is a vreg, we always merge from the
// vreg into the physreg, which leaves the vreg intervals pristine.
if ((Other.ranges.size() > ranges.size() &&
MRegisterInfo::isVirtualRegister(reg)) ||
MRegisterInfo::isPhysicalRegister(Other.reg)) {
swap(Other);
std::swap(LHSValNoAssignments, RHSValNoAssignments);
}
// Determine if any of our live range values are mapped. This is uncommon, so
// we want to avoid the interval scan if not.
bool MustMapCurValNos = false;
for (unsigned i = 0, e = getNumValNums(); i != e; ++i) {
if (ValueNumberInfo[i].def == ~1U) continue; // tombstone value #
if (getDefForValNum(i) == ~1U) continue; // tombstone value #
if (i != (unsigned)LHSValNoAssignments[i]) {
MustMapCurValNos = true;
break;
@@ -345,7 +332,9 @@ void LiveInterval::join(LiveInterval &Other, int *LHSValNoAssignments,
// Update val# info first. Increasing live ranges may invalidate some kills.
ValueNumberInfo.clear();
ValueNumberInfo.append(NewValueNumberInfo.begin(), NewValueNumberInfo.end());
for (SmallVector<VNInfo, 16>::iterator I = NewValueNumberInfo.begin(),
E = NewValueNumberInfo.end(); I != E; ++I)
ValueNumberInfo.push_back(*I);
// Okay, now insert the RHS live ranges into the LHS.
iterator InsertPos = begin();
@@ -472,7 +461,7 @@ void LiveInterval::MergeValueNumberInto(unsigned V1, unsigned V2) {
ValueNumberInfo.pop_back();
} while (ValueNumberInfo.back().def == ~1U);
} else {
ValueNumberInfo[V1].def = ~1U;
setDefForValNum(V1, ~1U);
}
}
@@ -511,22 +500,25 @@ void LiveInterval::print(std::ostream &OS, const MRegisterInfo *MRI) const {
// Print value number info.
if (getNumValNums()) {
OS << " ";
for (unsigned i = 0; i != getNumValNums(); ++i) {
if (i) OS << " ";
OS << i << "@";
if (ValueNumberInfo[i].def == ~1U) {
unsigned vnum = 0;
for (const_vni_iterator i = vni_begin(), e = vni_end(); i != e;
++i, ++vnum) {
const VNInfo &vni = *i;
if (vnum) OS << " ";
OS << vnum << "@";
if (vni.def == ~1U) {
OS << "x";
} else {
if (ValueNumberInfo[i].def == ~0U)
if (vni.def == ~0U)
OS << "?";
else
OS << ValueNumberInfo[i].def;
unsigned e = ValueNumberInfo[i].kills.size();
if (e) {
OS << vni.def;
unsigned ee = vni.kills.size();
if (ee) {
OS << "-(";
for (unsigned j = 0; j != e; ++j) {
OS << ValueNumberInfo[i].kills[j];
if (j != e-1)
for (unsigned j = 0; j != ee; ++j) {
OS << vni.kills[j];
if (j != ee-1)
OS << " ";
}
OS << ")";