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Teach the LiveInterval::join function to use the fast merge algorithm,

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generalizing its implementation sufficiently to support this value
number scenario as well.

This cuts out another significant performance hit in large functions
(over 10k basic blocks, etc), especially those with "natural" CFG
structures.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160026 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
2012-07-10 22:25:21 +00:00
parent 1f523dc45e
commit 4e996de58c
2 changed files with 18 additions and 15 deletions
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2
include/llvm/CodeGen/LiveInterval.h
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@@ -505,7 +505,7 @@ namespace llvm {
Ranges::iterator extendIntervalStartTo(Ranges::iterator I, SlotIndex NewStr);
void markValNoForDeletion(VNInfo *V);
void mergeIntervalRanges(const LiveInterval &RHS,
VNInfo *LHSValNo,
VNInfo *LHSValNo = 0,
const VNInfo *RHSValNo = 0);
LiveInterval& operator=(const LiveInterval& rhs); // DO NOT IMPLEMENT