1; RUN: opt -S -loop-unswitch -enable-new-pm=0 < %s | FileCheck %s 2; RUN: opt -S -loop-unswitch -enable-new-pm=0 -enable-mssa-loop-dependency=true -verify-memoryssa < %s | FileCheck %s 3 4declare void @llvm.experimental.guard(i1, ...) 5 6define void @f_0(i32 %n, i32* %ptr, i1 %c) { 7; CHECK-LABEL: @f_0( 8; CHECK: loop.us: 9; CHECK-NOT: guard 10; CHECK: loop: 11; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ] 12entry: 13 br label %loop 14 15loop: 16 %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] 17 %iv.inc = add i32 %iv, 1 18 call void(i1, ...) @llvm.experimental.guard(i1 %c) [ "deopt"() ] 19 store volatile i32 0, i32* %ptr 20 %becond = icmp ult i32 %iv.inc, %n 21 br i1 %becond, label %leave, label %loop 22 23leave: 24 ret void 25} 26 27define void @f_1(i32 %n, i32* %ptr, i1 %c_0, i1 %c_1) { 28; CHECK-LABEL: @f_1( 29; CHECK: loop.us.us: 30; CHECK-NOT: guard 31; CHECK: loop.us: 32; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 2) ] 33; CHECK-NOT: guard 34; CHECK: loop.us1: 35; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 1) ] 36; CHECK-NOT: guard 37; CHECK: loop: 38; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 1) ] 39; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"(i32 2) ] 40entry: 41 br label %loop 42 43loop: 44 %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] 45 %iv.inc = add i32 %iv, 1 46 call void(i1, ...) @llvm.experimental.guard(i1 %c_0) [ "deopt"(i32 1) ] 47 store volatile i32 0, i32* %ptr 48 call void(i1, ...) @llvm.experimental.guard(i1 %c_1) [ "deopt"(i32 2) ] 49 %becond = icmp ult i32 %iv.inc, %n 50 br i1 %becond, label %leave, label %loop 51 52leave: 53 ret void 54} 55 56; Basic negative test 57 58define void @f_3(i32 %n, i32* %ptr, i1* %c_ptr) { 59; CHECK-LABEL: @f_3( 60; CHECK-NOT: loop.us: 61entry: 62 br label %loop 63 64loop: 65 %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] 66 %iv.inc = add i32 %iv, 1 67 %c = load volatile i1, i1* %c_ptr 68 call void(i1, ...) @llvm.experimental.guard(i1 %c) [ "deopt"() ] 69 store volatile i32 0, i32* %ptr 70 %becond = icmp ult i32 %iv.inc, %n 71 br i1 %becond, label %leave, label %loop 72 73leave: 74 ret void 75} 76 77define void @f_4(i32 %n, i32* %ptr, i1 %c) { 78; CHECK-LABEL: @f_4( 79; 80; Demonstrate that unswitching on one guard can cause another guard to 81; be erased (this has implications on what guards we can keep raw 82; pointers to). 83entry: 84 br label %loop 85 86loop: 87 %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ] 88 %iv.inc = add i32 %iv, 1 89 call void(i1, ...) @llvm.experimental.guard(i1 %c) [ "deopt"(i32 1) ] 90 store volatile i32 0, i32* %ptr 91 %neg = xor i1 %c, 1 92 call void(i1, ...) @llvm.experimental.guard(i1 %neg) [ "deopt"(i32 2) ] 93 %becond = icmp ult i32 %iv.inc, %n 94 br i1 %becond, label %leave, label %loop 95 96leave: 97 ret void 98} 99