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