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| author | Andrew Trick <atrick@apple.com> | 2012-06-26 04:11:38 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2012-06-26 04:11:38 +0000 |
| commit | c9b1e25493b393013b28e5d457f2fb2845a4dd9f (patch) | |
| tree | c1193bd83841e829e703beeb00c1fe6415de5f05 /test/Transforms/LCSSA | |
| parent | 5ac3f96c0e4a1f6b8253aabf74fe30b0439e9bdf (diff) | |
| download | llvm-c9b1e25493b393013b28e5d457f2fb2845a4dd9f.tar.gz llvm-c9b1e25493b393013b28e5d457f2fb2845a4dd9f.tar.bz2 llvm-c9b1e25493b393013b28e5d457f2fb2845a4dd9f.tar.xz | |
Enable the new LoopInfo algorithm by default.
The primary advantage is that loop optimizations will be applied in a
stable order. This helps debugging and unit test creation. It is also
a better overall implementation without pathologically bad performance
on deep functions.
On large functions (llvm-stress --size=200000 | opt -loops)
Before: 0.1263s
After: 0.0225s
On deep functions (after tweaking llvm-stress, thanks Nadav):
Before: 0.2281s
After: 0.0227s
See r158790 for more comments.
The loop tree is now consistently generated in forward order, but loop
passes are applied in reverse order over the program. If we have a
loop optimization that prefers forward order, that can easily be
achieved by adding a different type of LoopPassManager.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159183 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/LCSSA')
| -rw-r--r-- | test/Transforms/LCSSA/unused-phis.ll | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/test/Transforms/LCSSA/unused-phis.ll b/test/Transforms/LCSSA/unused-phis.ll index aa2ab96341..01b214b8e3 100644 --- a/test/Transforms/LCSSA/unused-phis.ll +++ b/test/Transforms/LCSSA/unused-phis.ll @@ -2,9 +2,9 @@ ; CHECK: exit1: ; CHECK: .lcssa = ; CHECK: exit2: -; CHECK: .lcssa2 = +; CHECK: .lcssa1 = ; CHECK: exit3: -; CHECK-NOT: .lcssa1 = +; CHECK-NOT: .lcssa ; Test to ensure that when there are multiple exit blocks, PHI nodes are ; only inserted by LCSSA when there is a use dominated by a given exit |