| Stepan Dyatkovskiy | 8216569 | 2012-01-11 08:40:51 +0000 | [diff] [blame^] | 1 | ; RUN: opt -loop-unswitch -loop-unswitch-threshold 13 -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s |
| 2 | ; RUN: opt -S -loop-unswitch -loop-unswitch-threshold 13 -verify-loop-info -verify-dom-info %s | FileCheck %s |
| Chad Rosier | 3887694 | 2011-12-22 21:06:36 +0000 | [diff] [blame] | 3 | |
| 4 | ; STATS: 1 loop-simplify - Number of pre-header or exit blocks inserted |
| 5 | ; STATS: 1 loop-unswitch - Number of switches unswitched |
| 6 | |
| 7 | ; ModuleID = '../llvm/test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches.ll' |
| 8 | |
| 9 | ; CHECK: %1 = icmp eq i32 %c, 1 |
| 10 | ; CHECK-NEXT: br i1 %1, label %.split.us, label %..split_crit_edge |
| 11 | |
| 12 | ; CHECK: ..split_crit_edge: ; preds = %0 |
| 13 | ; CHECK-NEXT: br label %.split |
| 14 | |
| 15 | ; CHECK: .split.us: ; preds = %0 |
| 16 | ; CHECK-NEXT: br label %loop_begin.us |
| 17 | |
| 18 | ; CHECK: loop_begin.us: ; preds = %loop_begin.backedge.us, %.split.us |
| 19 | ; CHECK: switch i32 1, label %second_switch.us [ |
| 20 | ; CHECK-NEXT: i32 1, label %inc.us |
| 21 | |
| 22 | ; CHECK: inc.us: ; preds = %second_switch.us, %loop_begin.us |
| 23 | ; CHECK-NEXT: call void @incf() noreturn nounwind |
| 24 | ; CHECK-NEXT: br label %loop_begin.backedge.us |
| 25 | |
| 26 | ; CHECK: second_switch.us: ; preds = %loop_begin.us |
| 27 | ; CHECK-NEXT: switch i32 %d, label %default.us [ |
| 28 | ; CHECK-NEXT: i32 1, label %inc.us |
| 29 | ; CHECK-NEXT: ] |
| 30 | |
| 31 | ; CHECK: .split: ; preds = %..split_crit_edge |
| 32 | ; CHECK-NEXT: br label %loop_begin |
| 33 | |
| 34 | ; CHECK: loop_begin: ; preds = %loop_begin.backedge, %.split |
| 35 | ; CHECK: switch i32 %c, label %second_switch [ |
| 36 | ; CHECK-NEXT: i32 1, label %loop_begin.inc_crit_edge |
| 37 | ; CHECK-NEXT: ] |
| 38 | |
| 39 | ; CHECK: loop_begin.inc_crit_edge: ; preds = %loop_begin |
| 40 | ; CHECK-NEXT: br i1 true, label %us-unreachable, label %inc |
| 41 | |
| 42 | ; CHECK: second_switch: ; preds = %loop_begin |
| 43 | ; CHECK-NEXT: switch i32 %d, label %default [ |
| 44 | ; CHECK-NEXT: i32 1, label %inc |
| 45 | ; CHECK-NEXT: ] |
| 46 | |
| 47 | ; CHECK: inc: ; preds = %loop_begin.inc_crit_edge, %second_switch |
| 48 | ; CHECK-NEXT: call void @incf() noreturn nounwind |
| 49 | ; CHECK-NEXT: br label %loop_begin.backedge |
| 50 | |
| 51 | define i32 @test(i32* %var) { |
| 52 | %mem = alloca i32 |
| 53 | store i32 2, i32* %mem |
| 54 | %c = load i32* %mem |
| 55 | %d = load i32* %mem |
| 56 | |
| 57 | br label %loop_begin |
| 58 | |
| 59 | loop_begin: |
| 60 | |
| 61 | %var_val = load i32* %var |
| 62 | |
| 63 | switch i32 %c, label %second_switch [ |
| 64 | i32 1, label %inc |
| 65 | ] |
| 66 | |
| 67 | second_switch: |
| 68 | switch i32 %d, label %default [ |
| 69 | i32 1, label %inc |
| 70 | ] |
| 71 | |
| 72 | inc: |
| 73 | call void @incf() noreturn nounwind |
| 74 | br label %loop_begin |
| 75 | |
| 76 | default: |
| 77 | br label %loop_begin |
| 78 | |
| 79 | loop_exit: |
| 80 | ret i32 0 |
| 81 | } |
| 82 | |
| 83 | declare void @incf() noreturn |
| 84 | declare void @decf() noreturn |