1*9880d681SAndroid Build Coastguard Worker; RUN: opt -S -loop-rotate < %s -verify-loop-info | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker; 3*9880d681SAndroid Build Coastguard Worker; Verify that LoopRotate preserves LoopSimplify form even in very peculiar loop 4*9880d681SAndroid Build Coastguard Worker; structures. We manually validate the CFG with FileCheck because currently we 5*9880d681SAndroid Build Coastguard Worker; can't cause a failure when LoopSimplify fails to be preserved. 6*9880d681SAndroid Build Coastguard Worker 7*9880d681SAndroid Build Coastguard Workerdefine void @PR18643() { 8*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @PR18643( 9*9880d681SAndroid Build Coastguard Workerentry: 10*9880d681SAndroid Build Coastguard Worker br label %outer.header 11*9880d681SAndroid Build Coastguard Worker; CHECK: br label %outer.header 12*9880d681SAndroid Build Coastguard Worker 13*9880d681SAndroid Build Coastguard Workerouter.header: 14*9880d681SAndroid Build Coastguard Worker; CHECK: outer.header: 15*9880d681SAndroid Build Coastguard Worker br i1 undef, label %inner.header, label %outer.body 16*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: br i1 {{[^,]*}}, label %[[INNER_PREROTATE_PREHEADER:[^,]*]], label %outer.body 17*9880d681SAndroid Build Coastguard Worker 18*9880d681SAndroid Build Coastguard Worker; CHECK: [[INNER_PREROTATE_PREHEADER]]: 19*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: br i1 {{[^,]*}}, label %[[INNER_PREROTATE_PREHEADER_SPLIT_RETURN:[^,]*]], label %[[INNER_ROTATED_PREHEADER:[^,]*]] 20*9880d681SAndroid Build Coastguard Worker 21*9880d681SAndroid Build Coastguard Worker; CHECK: [[INNER_ROTATED_PREHEADER]]: 22*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: br label %inner.body 23*9880d681SAndroid Build Coastguard Worker 24*9880d681SAndroid Build Coastguard Workerinner.header: 25*9880d681SAndroid Build Coastguard Worker; Now the latch! 26*9880d681SAndroid Build Coastguard Worker; CHECK: inner.header: 27*9880d681SAndroid Build Coastguard Worker br i1 undef, label %return, label %inner.body 28*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: br i1 {{[^,]*}}, label %[[INNER_SPLIT_RETURN:[^,]*]], label %inner.body 29*9880d681SAndroid Build Coastguard Worker 30*9880d681SAndroid Build Coastguard Workerinner.body: 31*9880d681SAndroid Build Coastguard Worker; Now the header! 32*9880d681SAndroid Build Coastguard Worker; CHECK: inner.body: 33*9880d681SAndroid Build Coastguard Worker br i1 undef, label %outer.latch, label %inner.latch 34*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: br i1 {{[^,]*}}, label %[[INNER_SPLIT_OUTER_LATCH:[^,]*]], label %inner.header 35*9880d681SAndroid Build Coastguard Worker 36*9880d681SAndroid Build Coastguard Workerinner.latch: 37*9880d681SAndroid Build Coastguard Worker; Dead! 38*9880d681SAndroid Build Coastguard Worker br label %inner.header 39*9880d681SAndroid Build Coastguard Worker 40*9880d681SAndroid Build Coastguard Workerouter.body: 41*9880d681SAndroid Build Coastguard Worker; CHECK: outer.body: 42*9880d681SAndroid Build Coastguard Worker br label %outer.latch 43*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: br label %outer.latch 44*9880d681SAndroid Build Coastguard Worker 45*9880d681SAndroid Build Coastguard Worker; L2 -> L1 exit edge needs a simplified exit block. 46*9880d681SAndroid Build Coastguard Worker; CHECK: [[INNER_SPLIT_OUTER_LATCH]]: 47*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: br label %outer.latch 48*9880d681SAndroid Build Coastguard Worker 49*9880d681SAndroid Build Coastguard Workerouter.latch: 50*9880d681SAndroid Build Coastguard Worker; CHECK: outer.latch: 51*9880d681SAndroid Build Coastguard Worker br label %outer.header 52*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: br label %outer.header 53*9880d681SAndroid Build Coastguard Worker 54*9880d681SAndroid Build Coastguard Worker; L1 -> L0 exit edge need sa simplified exit block. 55*9880d681SAndroid Build Coastguard Worker; CHECK: [[INNER_PREROTATE_PREHEADER_SPLIT_RETURN]]: 56*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: br label %return 57*9880d681SAndroid Build Coastguard Worker 58*9880d681SAndroid Build Coastguard Worker; L2 -> L0 exit edge needs a simplified exit block. 59*9880d681SAndroid Build Coastguard Worker; CHECK: [[INNER_SPLIT_RETURN]]: 60*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: br label %return 61*9880d681SAndroid Build Coastguard Worker 62*9880d681SAndroid Build Coastguard Workerreturn: 63*9880d681SAndroid Build Coastguard Worker; CHECK: return: 64*9880d681SAndroid Build Coastguard Worker unreachable 65*9880d681SAndroid Build Coastguard Worker} 66