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| author | Andrew Trick <atrick@apple.com> | 2013-07-25 18:35:22 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2013-07-25 18:35:22 +0000 |
| commit | bef4c3e069a66c8b2d5871468cb57978f44ddc54 (patch) | |
| tree | 7f02673ce94d01aa0bbf81673ad7b485468ef0d4 /lib/CodeGen/RegAllocGreedy.cpp | |
| parent | 8adae96fd905daa8835b6fde5e74e25d818c7471 (diff) | |
| download | llvm-bef4c3e069a66c8b2d5871468cb57978f44ddc54.tar.gz llvm-bef4c3e069a66c8b2d5871468cb57978f44ddc54.tar.bz2 llvm-bef4c3e069a66c8b2d5871468cb57978f44ddc54.tar.xz | |
RegAllocGreedy comment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187141 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/RegAllocGreedy.cpp')
| -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 79253715c3..87b11a5f51 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)); } |