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Simplify logic now that r182490 is in place. No functional change intended.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182527 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2013-05-22 22:36:55 +00:00
parent 5cc3c989fc
commit b018bab0b8
1 changed files with 4 additions and 8 deletions
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12
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -229,10 +229,8 @@ void LiveIntervals::computeRegUnitInterval(LiveInterval *LI) {
// idempotent. It is very rare for a register unit to have multiple roots, so
// uniquing super-registers is probably not worthwhile.
for (MCRegUnitRootIterator Roots(Unit, TRI); Roots.isValid(); ++Roots) {
unsigned Root = *Roots;
if (!MRI->reg_empty(Root))
LRCalc->createDeadDefs(LI, Root);
for (MCSuperRegIterator Supers(Root, TRI); Supers.isValid(); ++Supers) {
for (MCSuperRegIterator Supers(*Roots, TRI, /*IncludeSelf=*/true);
Supers.isValid(); ++Supers) {
if (!MRI->reg_empty(*Supers))
LRCalc->createDeadDefs(LI, *Supers);
}
@ -241,10 +239,8 @@ void LiveIntervals::computeRegUnitInterval(LiveInterval *LI) {
// Now extend LI to reach all uses.
// Ignore uses of reserved registers. We only track defs of those.
for (MCRegUnitRootIterator Roots(Unit, TRI); Roots.isValid(); ++Roots) {
unsigned Root = *Roots;
if (!MRI->isReserved(Root) && !MRI->reg_empty(Root))
LRCalc->extendToUses(LI, Root);
for (MCSuperRegIterator Supers(Root, TRI); Supers.isValid(); ++Supers) {
for (MCSuperRegIterator Supers(*Roots, TRI, /*IncludeSelf=*/true);
Supers.isValid(); ++Supers) {
unsigned Reg = *Supers;
if (!MRI->isReserved(Reg) && !MRI->reg_empty(Reg))
LRCalc->extendToUses(LI, Reg);