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LiveInterval: A LiveRange is enough for ConnectedVNInfoEqClasses::Classify()

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257129 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2016-01-08 01:16:35 +00:00
parent 2c2e12150f
commit dcaeedf3f4
4 changed files with 10 additions and 10 deletions
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lib/CodeGen/LiveInterval.cpp
+5 -5
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@@ -1328,15 +1328,15 @@ void LiveRangeUpdater::flush() {
LR->verify();
}
unsigned ConnectedVNInfoEqClasses::Classify(const LiveInterval *LI) {
unsigned ConnectedVNInfoEqClasses::Classify(const LiveRange &LR) {
// Create initial equivalence classes.
EqClass.clear();
EqClass.grow(LI->getNumValNums());
EqClass.grow(LR.getNumValNums());
const VNInfo *used = nullptr, *unused = nullptr;
// Determine connections.
for (const VNInfo *VNI : LI->valnos) {
for (const VNInfo *VNI : LR.valnos) {
// Group all unused values into one class.
if (VNI->isUnused()) {
if (unused)
@@ -1351,14 +1351,14 @@ unsigned ConnectedVNInfoEqClasses::Classify(const LiveInterval *LI) {
// Connect to values live out of predecessors.
for (MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(),
PE = MBB->pred_end(); PI != PE; ++PI)
if (const VNInfo *PVNI = LI->getVNInfoBefore(LIS.getMBBEndIdx(*PI)))
if (const VNInfo *PVNI = LR.getVNInfoBefore(LIS.getMBBEndIdx(*PI)))
EqClass.join(VNI->id, PVNI->id);
} else {
// Normal value defined by an instruction. Check for two-addr redef.
// FIXME: This could be coincidental. Should we really check for a tied
// operand constraint?
// Note that VNI->def may be a use slot for an early clobber def.
if (const VNInfo *UVNI = LI->getVNInfoBefore(VNI->def))
if (const VNInfo *UVNI = LR.getVNInfoBefore(VNI->def))
EqClass.join(VNI->id, UVNI->id);
}
}