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RegAllocGreedy comment.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187141 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2013-07-25 18:35:22 +00:00
parent 8adae96fd9
commit bef4c3e069
1 changed files with 2 additions and 1 deletions

3
lib/CodeGen/RegAllocGreedy.cpp

@ -434,7 +434,8 @@ void RAGreedy::enqueue(LiveInterval *LI) {
if (VRM->hasKnownPreference(Reg))
Prio |= (1u << 30);
}
// The virtual register number is a tie breaker for same-sized ranges.
// Give lower vreg numbers higher priority to assign them first.
Queue.push(std::make_pair(Prio, ~Reg));
}