6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2026-04-23 22:23:00 +00:00
Code Issues Projects Releases Wiki Activity

Refine stack slot interval weight computation.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52040 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-06-06 07:54:39 +00:00
parent b0a882f540
commit 9c3c221364
3 changed files with 64 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/CodeGen/RegAllocLinearScan.cpp
+13 -8
View File
@@ -515,11 +515,14 @@ static void RevertVectorIteratorsTo(RALinScan::IntervalPtrs &V, unsigned Point){
/// addStackInterval - Create a LiveInterval for stack if the specified live
/// interval has been spilled.
static void addStackInterval(LiveInterval *cur, LiveStacks *ls_,
LiveIntervals *li_, VirtRegMap &vrm_) {
LiveIntervals *li_, float &Weight,
VirtRegMap &vrm_) {
int SS = vrm_.getStackSlot(cur->reg);
if (SS == VirtRegMap::NO_STACK_SLOT)
return;
LiveInterval &SI = ls_->getOrCreateInterval(SS);
SI.weight += Weight;
VNInfo *VNI;
if (SI.getNumValNums())
VNI = SI.getValNumInfo(0);
@@ -529,7 +532,6 @@ static void addStackInterval(LiveInterval *cur, LiveStacks *ls_,
LiveInterval &RI = li_->getInterval(cur->reg);
// FIXME: This may be overly conservative.
SI.MergeRangesInAsValue(RI, VNI);
SI.weight += RI.weight;
}
/// assignRegOrStackSlotAtInterval - assign a register if one is available, or
@@ -743,9 +745,10 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur)
// linearscan.
if (cur->weight != HUGE_VALF && cur->weight <= minWeight) {
DOUT << "\t\t\tspilling(c): " << *cur << '\n';
float SSWeight;
std::vector<LiveInterval*> added =
li_->addIntervalsForSpills(*cur, loopInfo, *vrm_);
addStackInterval(cur, ls_, li_, *vrm_);
li_->addIntervalsForSpills(*cur, loopInfo, *vrm_, SSWeight);
addStackInterval(cur, ls_, li_, SSWeight, *vrm_);
if (added.empty())
return; // Early exit if all spills were folded.
@@ -796,9 +799,10 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur)
cur->overlapsFrom(*i->first, i->second)) {
DOUT << "\t\t\tspilling(a): " << *i->first << '\n';
earliestStart = std::min(earliestStart, i->first->beginNumber());
float SSWeight;
std::vector<LiveInterval*> newIs =
li_->addIntervalsForSpills(*i->first, loopInfo, *vrm_);
addStackInterval(i->first, ls_, li_, *vrm_);
li_->addIntervalsForSpills(*i->first, loopInfo, *vrm_, SSWeight);
addStackInterval(i->first, ls_, li_, SSWeight, *vrm_);
std::copy(newIs.begin(), newIs.end(), std::back_inserter(added));
spilled.insert(reg);
}
@@ -810,9 +814,10 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur)
cur->overlapsFrom(*i->first, i->second-1)) {
DOUT << "\t\t\tspilling(i): " << *i->first << '\n';
earliestStart = std::min(earliestStart, i->first->beginNumber());
float SSWeight;
std::vector<LiveInterval*> newIs =
li_->addIntervalsForSpills(*i->first, loopInfo, *vrm_);
addStackInterval(i->first, ls_, li_, *vrm_);
li_->addIntervalsForSpills(*i->first, loopInfo, *vrm_, SSWeight);
addStackInterval(i->first, ls_, li_, SSWeight, *vrm_);
std::copy(newIs.begin(), newIs.end(), std::back_inserter(added));
spilled.insert(reg);
}