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authorAndrew Trick <atrick@apple.com>2012-06-26 04:11:38 +0000
committerAndrew Trick <atrick@apple.com>2012-06-26 04:11:38 +0000
commitc9b1e25493b393013b28e5d457f2fb2845a4dd9f (patch)
treec1193bd83841e829e703beeb00c1fe6415de5f05 /test/Transforms/LoopUnswitch
parent5ac3f96c0e4a1f6b8253aabf74fe30b0439e9bdf (diff)
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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')
-rw-r--r--test/Transforms/LoopUnswitch/2011-11-18-SimpleSwitch.ll8
-rw-r--r--test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches-Threshold.ll10
-rw-r--r--test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches.ll34
3 files changed, 26 insertions, 26 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
diff --git a/test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches-Threshold.ll b/test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches-Threshold.ll
index 05d98d513e..f3db471199 100644
--- a/test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches-Threshold.ll
+++ b/test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches-Threshold.ll
@@ -19,15 +19,15 @@
; CHECK: switch i32 1, label %second_switch.us [
; CHECK-NEXT: i32 1, label %inc.us
-; CHECK: inc.us: ; preds = %second_switch.us, %loop_begin.us
-; CHECK-NEXT: call void @incf() noreturn nounwind
-; CHECK-NEXT: br label %loop_begin.backedge.us
-
; CHECK: second_switch.us: ; preds = %loop_begin.us
; CHECK-NEXT: switch i32 %d, label %default.us [
; CHECK-NEXT: i32 1, label %inc.us
; CHECK-NEXT: ]
+; CHECK: inc.us: ; preds = %second_switch.us, %loop_begin.us
+; CHECK-NEXT: call void @incf() noreturn nounwind
+; CHECK-NEXT: br label %loop_begin.backedge.us
+
; CHECK: .split: ; preds = %..split_crit_edge
; CHECK-NEXT: br label %loop_begin
@@ -73,7 +73,7 @@ inc:
call void @incf() noreturn nounwind
br label %loop_begin
-default:
+default:
br label %loop_begin
loop_exit:
diff --git a/test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches.ll b/test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches.ll
index 1b186d6bec..270899642f 100644
--- a/test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches.ll
+++ b/test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches.ll
@@ -25,14 +25,14 @@
; CHECK-NEXT: switch i32 1, label %second_switch.us.us [
; CHECK-NEXT: i32 1, label %inc.us.us
-; CHECK: inc.us.us: ; preds = %second_switch.us.us, %loop_begin.us.us
-; CHECK-NEXT: call void @incf() noreturn nounwind
-; CHECK-NEXT: br label %loop_begin.backedge.us.us
-
; CHECK: second_switch.us.us: ; preds = %loop_begin.us.us
; CHECK-NEXT: switch i32 1, label %default.us.us [
; CHECK-NEXT: i32 1, label %inc.us.us
+; CHECK: inc.us.us: ; preds = %second_switch.us.us, %loop_begin.us.us
+; CHECK-NEXT: call void @incf() noreturn nounwind
+; CHECK-NEXT: br label %loop_begin.backedge.us.us
+
; CHECK: .split.us.split: ; preds = %.split.us..split.us.split_crit_edge
; CHECK-NEXT: br label %loop_begin.us
@@ -41,10 +41,6 @@
; CHECK-NEXT: switch i32 1, label %second_switch.us [
; CHECK-NEXT: i32 1, label %inc.us
-; CHECK: inc.us: ; preds = %second_switch.us.inc.us_crit_edge, %loop_begin.us
-; CHECK-NEXT: call void @incf() noreturn nounwind
-; CHECK-NEXT: br label %loop_begin.backedge.us
-
; CHECK: second_switch.us: ; preds = %loop_begin.us
; CHECK-NEXT: switch i32 %d, label %default.us [
; CHECK-NEXT: i32 1, label %second_switch.us.inc.us_crit_edge
@@ -53,6 +49,10 @@
; CHECK: second_switch.us.inc.us_crit_edge: ; preds = %second_switch.us
; CHECK-NEXT: br i1 true, label %us-unreachable8, label %inc.us
+; CHECK: inc.us: ; preds = %second_switch.us.inc.us_crit_edge, %loop_begin.us
+; CHECK-NEXT: call void @incf() noreturn nounwind
+; CHECK-NEXT: br label %loop_begin.backedge.us
+
; CHECK: .split: ; preds = %..split_crit_edge
; CHECK-NEXT: %3 = icmp eq i32 %d, 1
; CHECK-NEXT: br i1 %3, label %.split.split.us, label %.split..split.split_crit_edge
@@ -65,21 +65,21 @@
; CHECK: loop_begin.us1: ; preds = %loop_begin.backedge.us6, %.split.split.us
; CHECK-NEXT: %var_val.us2 = load i32* %var
-; CHECK-NEXT: switch i32 %c, label %second_switch.us4 [
+; CHECK-NEXT: switch i32 %c, label %second_switch.us3 [
; CHECK-NEXT: i32 1, label %loop_begin.inc_crit_edge.us
; CHECK-NEXT: ]
-; CHECK: inc.us3: ; preds = %loop_begin.inc_crit_edge.us, %second_switch.us4
-; CHECK-NEXT: call void @incf() noreturn nounwind
-; CHECK-NEXT: br label %loop_begin.backedge.us6
-
-; CHECK: second_switch.us4: ; preds = %loop_begin.us1
+; CHECK: second_switch.us3: ; preds = %loop_begin.us1
; CHECK-NEXT: switch i32 1, label %default.us5 [
-; CHECK-NEXT: i32 1, label %inc.us3
+; CHECK-NEXT: i32 1, label %inc.us4
; CHECK-NEXT: ]
+; CHECK: inc.us4: ; preds = %loop_begin.inc_crit_edge.us, %second_switch.us3
+; CHECK-NEXT: call void @incf() noreturn nounwind
+; CHECK-NEXT: br label %loop_begin.backedge.us6
+
; CHECK: loop_begin.inc_crit_edge.us: ; preds = %loop_begin.us1
-; CHECK-NEXT: br i1 true, label %us-unreachable.us-lcssa.us, label %inc.us3
+; CHECK-NEXT: br i1 true, label %us-unreachable.us-lcssa.us, label %inc.us4
; CHECK: .split.split: ; preds = %.split..split.split_crit_edge
; CHECK-NEXT: br label %loop_begin
@@ -127,7 +127,7 @@ inc:
call void @incf() noreturn nounwind
br label %loop_begin
-default:
+default:
br label %loop_begin
loop_exit: