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Fold open interval ends handling into 

LiveIntervals::Interval::expiredAt() and simplify regalloc code.

llvm-svn: 10894
This commit is contained in:
Alkis Evlogimenos 2004-01-16 20:17:05 +00:00
parent e9c6ba891e
commit d86933d21d
2 changed files with 5 additions and 11 deletions
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2
llvm/include/llvm/CodeGen/LiveIntervals.h
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@ -57,7 +57,7 @@ namespace llvm {
}
bool expiredAt(unsigned index) const {
return end() <= index;
return end() <= (index + 1);
}
bool liveAt(unsigned index) const;

14
llvm/lib/CodeGen/RegAllocLinearScan.cpp
View File

@ -428,11 +428,8 @@ void RA::processActiveIntervals(IntervalPtrs::value_type cur)
DEBUG(std::cerr << "\tprocessing active intervals:\n");
for (IntervalPtrs::iterator i = active_.begin(); i != active_.end();) {
unsigned reg = (*i)->reg;
// remove expired intervals. we expire earlier because this if
// an interval expires this is going to be the last use. in
// this case we can reuse the register for a def in the same
// instruction
if ((*i)->expiredAt(cur->start() + 1)) {
// remove expired intervals
if ((*i)->expiredAt(cur->start())) {
DEBUG(std::cerr << "\t\tinterval " << **i << " expired\n");
if (reg >= MRegisterInfo::FirstVirtualRegister) {
reg = v2pMap_[reg];
@ -465,11 +462,8 @@ void RA::processInactiveIntervals(IntervalPtrs::value_type cur)
for (IntervalPtrs::iterator i = inactive_.begin(); i != inactive_.end();) {
unsigned reg = (*i)->reg;
// remove expired intervals. we expire earlier because this if
// an interval expires this is going to be the last use. in
// this case we can reuse the register for a def in the same
// instruction
if ((*i)->expiredAt(cur->start() + 1)) {
// remove expired intervals
if ((*i)->expiredAt(cur->start())) {
DEBUG(std::cerr << "\t\t\tinterval " << **i << " expired\n");
// remove from inactive
i = inactive_.erase(i);