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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182527 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 8 deletions

diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index f1b8394811..1ca2d46cc2 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -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);