Fold open interval ends handling into
LiveIntervals::Interval::expiredAt() and simplify regalloc code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10894 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp
index a88c55d..abd1390 100644
--- a/lib/CodeGen/RegAllocLinearScan.cpp
+++ b/lib/CodeGen/RegAllocLinearScan.cpp
@@ -428,11 +428,8 @@
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 @@
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);