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 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: second_switch.us: ; preds = %loop_begin.us 23 ; CHECK-NEXT: switch i32 %d, label %default.us [ 24 ; CHECK-NEXT: i32 1, label %inc.us 25 ; CHECK-NEXT: ] 26 27 ; CHECK: inc.us: ; preds = %second_switch.us, %loop_begin.us 28 ; CHECK-NEXT: call void @incf() noreturn nounwind 29 ; CHECK-NEXT: br label %loop_begin.backedge.us 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 85
