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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-09-14 16:45:39 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-09-14 16:45:39 +0000 |
| commit | c4c633852fbb8ab9ef2679b679d2862746d2fa3e (patch) | |
| tree | 5b90b80896129848d5bbc51e5d695c23a6016b80 /lib/CodeGen/MachineVerifier.cpp | |
| parent | 6148225b9590f18fcb6a1d3151d3158b316965e0 (diff) | |
Hoist back-copies to the least busy dominator.
When a back-copy is hoisted to the nearest common dominator, keep
looking up the dominator tree for a less loopy dominator, and place the
back-copy there instead.
Don't do this when a single existing back-copy dominates all the others.
Assume the client knows what he is doing, and keep the dominating
back-copy.
This prevents us from hoisting back-copies into loops in most cases. If
a value is defined in a loop with multiple exits, we may still hoist
back-copies into that loop. That is the speed/size tradeoff.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139698 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineVerifier.cpp')
0 files changed, 0 insertions, 0 deletions