diff options
| -rw-r--r-- | lib/CodeGen/RegAllocGreedy.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/CodeGen/RegAllocGreedy.cpp b/lib/CodeGen/RegAllocGreedy.cpp index 7925371..87b11a5 100644 --- a/lib/CodeGen/RegAllocGreedy.cpp +++ b/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)); } |