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 4 ; In general the CFG below is easily simplified but this is useful for 5 ; pass ordering issue elimination. 6 define 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 ; 26 entry: 27 br label %loop 28 29 loop: 30 %iv = phi i32 [0, %entry], [%iv.next, %backedge] 31 br i1 true, label %next, label %never1 32 next: 33 br i1 false, label %never2, label %backedge 34 backedge: 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 39 exit: 40 ret i1 false 41 never1: 42 unreachable 43 never2: 44 unreachable 45 } 46 47
