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avoid calling the virtual isMoveInstr method endlessly by caching its results.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29994 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-08-31 05:54:43 +00:00
parent b495fb0e8c
commit 91725b7585
4 changed files with 107 additions and 94 deletions
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24
lib/CodeGen/LiveInterval.cpp
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@ -280,7 +280,8 @@ LiveInterval::FindLiveRangeContaining(unsigned Idx) {
/// the intervals are not joinable, this aborts.
void LiveInterval::join(LiveInterval &Other, int *LHSValNoAssignments,
int *RHSValNoAssignments,
SmallVector<unsigned, 16> &NewInstDefiningValue) {
SmallVector<std::pair<unsigned,
unsigned>, 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,
@ -300,7 +301,7 @@ void LiveInterval::join(LiveInterval &Other, int *LHSValNoAssignments,
// we want to avoid the interval scan if not.
bool MustMapCurValNos = false;
for (unsigned i = 0, e = getNumValNums(); i != e; ++i) {
if (InstDefiningValue[i] == ~2U) continue; // tombstone value #
if (ValueNumberInfo[i].first == ~2U) continue; // tombstone value #
if (i != (unsigned)LHSValNoAssignments[i]) {
MustMapCurValNos = true;
break;
@ -345,9 +346,8 @@ void LiveInterval::join(LiveInterval &Other, int *LHSValNoAssignments,
InsertPos = addRangeFrom(*I, InsertPos);
}
InstDefiningValue.clear();
InstDefiningValue.append(NewInstDefiningValue.begin(),
NewInstDefiningValue.end());
ValueNumberInfo.clear();
ValueNumberInfo.append(NewValueNumberInfo.begin(), NewValueNumberInfo.end());
weight += Other.weight;
}
@ -360,7 +360,7 @@ void LiveInterval::MergeInClobberRanges(const LiveInterval &Clobbers) {
// Find a value # to use for the clobber ranges. If there is already a value#
// for unknown values, use it.
// FIXME: Use a single sentinal number for these!
unsigned ClobberValNo = getNextValue(~0U);
unsigned ClobberValNo = getNextValue(~0U, 0);
iterator IP = begin();
for (const_iterator I = Clobbers.begin(), E = Clobbers.end(); I != E; ++I) {
@ -399,7 +399,7 @@ void LiveInterval::MergeValueNumberInto(unsigned V1, unsigned V2) {
// Make sure V2 is smaller than V1.
if (V1 < V2) {
setInstDefiningValNum(V1, getInstForValNum(V2));
setValueNumberInfo(V1, getValNumInfo(V2));
std::swap(V1, V2);
}
@ -443,10 +443,10 @@ void LiveInterval::MergeValueNumberInto(unsigned V1, unsigned V2) {
// ~1U so it can be nuked later.
if (V1 == getNumValNums()-1) {
do {
InstDefiningValue.pop_back();
} while (InstDefiningValue.back() == ~1U);
ValueNumberInfo.pop_back();
} while (ValueNumberInfo.back().first == ~1U);
} else {
InstDefiningValue[V1] = ~1U;
ValueNumberInfo[V1].first = ~1U;
}
}
@ -482,10 +482,10 @@ void LiveInterval::print(std::ostream &OS, const MRegisterInfo *MRI) const {
for (unsigned i = 0; i != getNumValNums(); ++i) {
if (i) OS << " ";
OS << i << "@";
if (InstDefiningValue[i] == ~0U) {
if (ValueNumberInfo[i].first == ~0U) {
OS << "?";
} else {
OS << InstDefiningValue[i];
OS << ValueNumberInfo[i].first;
}
}
}