1*9880d681SAndroid Build Coastguard Worker; RUN: opt -S -loop-unswitch < %s | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker 3*9880d681SAndroid Build Coastguard Workerdeclare void @llvm.experimental.guard(i1, ...) 4*9880d681SAndroid Build Coastguard Worker 5*9880d681SAndroid Build Coastguard Workerdefine void @f_0(i32 %n, i32* %ptr, i1 %c) { 6*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @f_0( 7*9880d681SAndroid Build Coastguard Worker; CHECK: loop.us: 8*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: guard 9*9880d681SAndroid Build Coastguard Worker; CHECK: loop: 10*9880d681SAndroid Build Coastguard Worker; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] 11*9880d681SAndroid Build Coastguard Workerentry: 12*9880d681SAndroid Build Coastguard Worker br label %loop 13*9880d681SAndroid Build Coastguard Worker 14*9880d681SAndroid Build Coastguard Workerloop: 15*9880d681SAndroid Build Coastguard Worker %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] 16*9880d681SAndroid Build Coastguard Worker %iv.inc = add i32 %iv, 1 17*9880d681SAndroid Build Coastguard Worker call void(i1, ...) @llvm.experimental.guard(i1 %c) [ "deopt"() ] 18*9880d681SAndroid Build Coastguard Worker store volatile i32 0, i32* %ptr 19*9880d681SAndroid Build Coastguard Worker %becond = icmp ult i32 %iv.inc, %n 20*9880d681SAndroid Build Coastguard Worker br i1 %becond, label %leave, label %loop 21*9880d681SAndroid Build Coastguard Worker 22*9880d681SAndroid Build Coastguard Workerleave: 23*9880d681SAndroid Build Coastguard Worker ret void 24*9880d681SAndroid Build Coastguard Worker} 25*9880d681SAndroid Build Coastguard Worker 26*9880d681SAndroid Build Coastguard Workerdefine void @f_1(i32 %n, i32* %ptr, i1 %c_0, i1 %c_1) { 27*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @f_1( 28*9880d681SAndroid Build Coastguard Worker; CHECK: loop.us.us: 29*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: guard 30*9880d681SAndroid Build Coastguard Worker; CHECK: loop.us: 31*9880d681SAndroid Build Coastguard Worker; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 2) ] 32*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: guard 33*9880d681SAndroid Build Coastguard Worker; CHECK: loop.us1: 34*9880d681SAndroid Build Coastguard Worker; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 1) ] 35*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: guard 36*9880d681SAndroid Build Coastguard Worker; CHECK: loop: 37*9880d681SAndroid Build Coastguard Worker; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 1) ] 38*9880d681SAndroid Build Coastguard Worker; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 2) ] 39*9880d681SAndroid Build Coastguard Workerentry: 40*9880d681SAndroid Build Coastguard Worker br label %loop 41*9880d681SAndroid Build Coastguard Worker 42*9880d681SAndroid Build Coastguard Workerloop: 43*9880d681SAndroid Build Coastguard Worker %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] 44*9880d681SAndroid Build Coastguard Worker %iv.inc = add i32 %iv, 1 45*9880d681SAndroid Build Coastguard Worker call void(i1, ...) @llvm.experimental.guard(i1 %c_0) [ "deopt"(i32 1) ] 46*9880d681SAndroid Build Coastguard Worker store volatile i32 0, i32* %ptr 47*9880d681SAndroid Build Coastguard Worker call void(i1, ...) @llvm.experimental.guard(i1 %c_1) [ "deopt"(i32 2) ] 48*9880d681SAndroid Build Coastguard Worker %becond = icmp ult i32 %iv.inc, %n 49*9880d681SAndroid Build Coastguard Worker br i1 %becond, label %leave, label %loop 50*9880d681SAndroid Build Coastguard Worker 51*9880d681SAndroid Build Coastguard Workerleave: 52*9880d681SAndroid Build Coastguard Worker ret void 53*9880d681SAndroid Build Coastguard Worker} 54*9880d681SAndroid Build Coastguard Worker 55*9880d681SAndroid Build Coastguard Worker; Basic negative test 56*9880d681SAndroid Build Coastguard Worker 57*9880d681SAndroid Build Coastguard Workerdefine void @f_3(i32 %n, i32* %ptr, i1* %c_ptr) { 58*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @f_3( 59*9880d681SAndroid Build Coastguard Worker; CHECK-NOT: loop.us: 60*9880d681SAndroid Build Coastguard Workerentry: 61*9880d681SAndroid Build Coastguard Worker br label %loop 62*9880d681SAndroid Build Coastguard Worker 63*9880d681SAndroid Build Coastguard Workerloop: 64*9880d681SAndroid Build Coastguard Worker %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] 65*9880d681SAndroid Build Coastguard Worker %iv.inc = add i32 %iv, 1 66*9880d681SAndroid Build Coastguard Worker %c = load volatile i1, i1* %c_ptr 67*9880d681SAndroid Build Coastguard Worker call void(i1, ...) @llvm.experimental.guard(i1 %c) [ "deopt"() ] 68*9880d681SAndroid Build Coastguard Worker store volatile i32 0, i32* %ptr 69*9880d681SAndroid Build Coastguard Worker %becond = icmp ult i32 %iv.inc, %n 70*9880d681SAndroid Build Coastguard Worker br i1 %becond, label %leave, label %loop 71*9880d681SAndroid Build Coastguard Worker 72*9880d681SAndroid Build Coastguard Workerleave: 73*9880d681SAndroid Build Coastguard Worker ret void 74*9880d681SAndroid Build Coastguard Worker} 75*9880d681SAndroid Build Coastguard Worker 76*9880d681SAndroid Build Coastguard Workerdefine void @f_4(i32 %n, i32* %ptr, i1 %c) { 77*9880d681SAndroid Build Coastguard Worker; CHECK-LABEL: @f_4( 78*9880d681SAndroid Build Coastguard Worker; 79*9880d681SAndroid Build Coastguard Worker; Demonstrate that unswitching on one guard can cause another guard to 80*9880d681SAndroid Build Coastguard Worker; be erased (this has implications on what guards we can keep raw 81*9880d681SAndroid Build Coastguard Worker; pointers to). 82*9880d681SAndroid Build Coastguard Workerentry: 83*9880d681SAndroid Build Coastguard Worker br label %loop 84*9880d681SAndroid Build Coastguard Worker 85*9880d681SAndroid Build Coastguard Workerloop: 86*9880d681SAndroid Build Coastguard Worker %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] 87*9880d681SAndroid Build Coastguard Worker %iv.inc = add i32 %iv, 1 88*9880d681SAndroid Build Coastguard Worker call void(i1, ...) @llvm.experimental.guard(i1 %c) [ "deopt"(i32 1) ] 89*9880d681SAndroid Build Coastguard Worker store volatile i32 0, i32* %ptr 90*9880d681SAndroid Build Coastguard Worker %neg = xor i1 %c, 1 91*9880d681SAndroid Build Coastguard Worker call void(i1, ...) @llvm.experimental.guard(i1 %neg) [ "deopt"(i32 2) ] 92*9880d681SAndroid Build Coastguard Worker %becond = icmp ult i32 %iv.inc, %n 93*9880d681SAndroid Build Coastguard Worker br i1 %becond, label %leave, label %loop 94*9880d681SAndroid Build Coastguard Worker 95*9880d681SAndroid Build Coastguard Workerleave: 96*9880d681SAndroid Build Coastguard Worker ret void 97*9880d681SAndroid Build Coastguard Worker} 98