diff options
| 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/LoopUnswitch/2011-11-18-SimpleSwitch.ll | |
| parent | 5ac3f96c0e4a1f6b8253aabf74fe30b0439e9bdf (diff) | |
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/LoopUnswitch/2011-11-18-SimpleSwitch.ll')
| -rw-r--r-- | test/Transforms/LoopUnswitch/2011-11-18-SimpleSwitch.ll | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/test/Transforms/LoopUnswitch/2011-11-18-SimpleSwitch.ll b/test/Transforms/LoopUnswitch/2011-11-18-SimpleSwitch.ll index 8389fe4643..c1fd588106 100644 --- a/test/Transforms/LoopUnswitch/2011-11-18-SimpleSwitch.ll +++ b/test/Transforms/LoopUnswitch/2011-11-18-SimpleSwitch.ll @@ -35,11 +35,11 @@ ; CHECK: loop_begin.us1: ; preds = %loop_begin.backedge.us5, %.split.split.us ; CHECK-NEXT: %var_val.us2 = load i32* %var ; CHECK-NEXT: switch i32 2, label %default.us-lcssa.us-lcssa.us [ -; CHECK-NEXT: i32 1, label %inc.us3 -; CHECK-NEXT: i32 2, label %dec.us4 +; CHECK-NEXT: i32 1, label %inc.us4 +; CHECK-NEXT: i32 2, label %dec.us3 ; CHECK-NEXT: ] -; CHECK: dec.us4: ; preds = %loop_begin.us1 +; CHECK: dec.us3: ; preds = %loop_begin.us1 ; CHECK-NEXT: call void @decf() noreturn nounwind ; CHECK-NEXT: br label %loop_begin.backedge.us5 @@ -81,7 +81,7 @@ inc: dec: call void @decf() noreturn nounwind br label %loop_begin -default: +default: br label %loop_exit loop_exit: ret i32 0 |