1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -disable-output -print-mustexecute %s 2>&1 | FileCheck %s 3; RUN: opt -disable-output -passes=print-mustexecute %s 2>&1 | FileCheck %s 4 5; In general the CFG below is easily simplified but this is useful for 6; pass ordering issue elimination. 7define i1 @const_cond(i32 %high) { 8; CHECK-LABEL: @const_cond( 9; CHECK-NEXT: entry: 10; CHECK-NEXT: br label [[LOOP:%.*]] 11; CHECK: loop: 12; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ] ; (mustexec in: loop) 13; CHECK-NEXT: br i1 true, label [[NEXT:%.*]], label [[NEVER1:%.*]] ; (mustexec in: loop) 14; CHECK: next: 15; CHECK-NEXT: br i1 false, label [[NEVER2:%.*]], label [[BACKEDGE]] ; (mustexec in: loop) 16; CHECK: backedge: 17; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1 ; (mustexec in: loop) 18; CHECK-NEXT: [[EXIT_TEST:%.*]] = icmp slt i32 [[IV]], [[HIGH:%.*]] ; (mustexec in: loop) 19; CHECK-NEXT: br i1 [[EXIT_TEST]], label [[LOOP]], label [[EXIT:%.*]] ; (mustexec in: loop) 20; CHECK: exit: 21; CHECK-NEXT: ret i1 false 22; CHECK: never1: 23; CHECK-NEXT: unreachable 24; CHECK: never2: 25; CHECK-NEXT: unreachable 26; 27entry: 28 br label %loop 29 30loop: 31 %iv = phi i32 [0, %entry], [%iv.next, %backedge] 32 br i1 true, label %next, label %never1 33next: 34 br i1 false, label %never2, label %backedge 35backedge: 36 %iv.next = add nsw nuw i32 %iv, 1 37 %exit.test = icmp slt i32 %iv, %high 38 br i1 %exit.test, label %loop, label %exit 39 40exit: 41 ret i1 false 42never1: 43 unreachable 44never2: 45 unreachable 46} 47 48