1; REQUIRES: asserts 2; RUN: opt -loop-unswitch -loop-unswitch-threshold 13 -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s 3; RUN: opt -S -loop-unswitch -loop-unswitch-threshold 13 -verify-loop-info -verify-dom-info < %s | FileCheck %s 4 5; STATS: 1 loop-simplify - Number of pre-header or exit blocks inserted 6; STATS: 1 loop-unswitch - Number of switches unswitched 7 8; ModuleID = '../llvm/test/Transforms/LoopUnswitch/2011-11-18-TwoSwitches.ll' 9 10; CHECK: %1 = icmp eq i32 %c, 1 11; CHECK-NEXT: br i1 %1, label %.split.us, label %..split_crit_edge 12 13; CHECK: ..split_crit_edge: ; preds = %0 14; CHECK-NEXT: br label %.split 15 16; CHECK: .split.us: ; preds = %0 17; CHECK-NEXT: br label %loop_begin.us 18 19; CHECK: loop_begin.us: ; preds = %loop_begin.backedge.us, %.split.us 20; CHECK: switch i32 1, label %second_switch.us [ 21; CHECK-NEXT: i32 1, label %inc.us 22 23; CHECK: second_switch.us: ; preds = %loop_begin.us 24; CHECK-NEXT: switch i32 %d, label %default.us [ 25; CHECK-NEXT: i32 1, label %inc.us 26; CHECK-NEXT: ] 27 28; CHECK: inc.us: ; preds = %second_switch.us, %loop_begin.us 29; CHECK-NEXT: call void @incf() [[NOR_NUW:#[0-9]+]] 30; CHECK-NEXT: br label %loop_begin.backedge.us 31 32; CHECK: .split: ; preds = %..split_crit_edge 33; CHECK-NEXT: br label %loop_begin 34 35; CHECK: loop_begin: ; preds = %loop_begin.backedge, %.split 36; CHECK: switch i32 %c, label %second_switch [ 37; CHECK-NEXT: i32 1, label %loop_begin.inc_crit_edge 38; CHECK-NEXT: ] 39 40; CHECK: loop_begin.inc_crit_edge: ; preds = %loop_begin 41; CHECK-NEXT: br i1 true, label %us-unreachable, label %inc 42 43; CHECK: second_switch: ; preds = %loop_begin 44; CHECK-NEXT: switch i32 %d, label %default [ 45; CHECK-NEXT: i32 1, label %inc 46; CHECK-NEXT: ] 47 48; CHECK: inc: ; preds = %loop_begin.inc_crit_edge, %second_switch 49; CHECK-NEXT: call void @incf() [[NOR_NUW]] 50; CHECK-NEXT: br label %loop_begin.backedge 51 52define i32 @test(i32* %var) { 53 %mem = alloca i32 54 store i32 2, i32* %mem 55 %c = load i32, i32* %mem 56 %d = load i32, i32* %mem 57 58 br label %loop_begin 59 60loop_begin: 61 62 %var_val = load i32, i32* %var 63 64 switch i32 %c, label %second_switch [ 65 i32 1, label %inc 66 ] 67 68second_switch: 69 switch i32 %d, label %default [ 70 i32 1, label %inc 71 ] 72 73inc: 74 call void @incf() noreturn nounwind 75 br label %loop_begin 76 77default: 78 br label %loop_begin 79 80loop_exit: 81 ret i32 0 82} 83 84declare void @incf() noreturn 85declare void @decf() noreturn 86 87; CHECK: attributes #0 = { noreturn } 88; CHECK: attributes [[NOR_NUW]] = { noreturn nounwind } 89