1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4 2; RUN: opt -passes=newgvn -S -o - %s | FileCheck %s 3 4; If a branch has two identical successors, we cannot declare either dead. 5 6define void @widget(i1 %p) { 7; CHECK-LABEL: define void @widget( 8; CHECK-SAME: i1 [[P:%.*]]) { 9; CHECK-NEXT: entry: 10; CHECK-NEXT: br label [[BB2:%.*]] 11; CHECK: bb2: 12; CHECK-NEXT: [[T1:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[T2:%.*]], [[BB7:%.*]] ] 13; CHECK-NEXT: [[T2]] = add i64 [[T1]], 1 14; CHECK-NEXT: [[T3:%.*]] = icmp ult i64 0, [[T2]] 15; CHECK-NEXT: br i1 [[T3]], label [[BB3:%.*]], label [[BB4:%.*]] 16; CHECK: bb3: 17; CHECK-NEXT: [[T4:%.*]] = call i64 @f() 18; CHECK-NEXT: br label [[BB4]] 19; CHECK: bb4: 20; CHECK-NEXT: br i1 [[P]], label [[BB5:%.*]], label [[BB6:%.*]] 21; CHECK: bb5: 22; CHECK-NEXT: br i1 true, label [[BB7]], label [[BB7]] 23; CHECK: bb6: 24; CHECK-NEXT: br i1 true, label [[BB7]], label [[BB7]] 25; CHECK: bb7: 26; CHECK-NEXT: br i1 [[P]], label [[BB2]], label [[BB8:%.*]] 27; CHECK: bb8: 28; CHECK-NEXT: ret void 29; 30entry: 31 br label %bb2 32 33bb2: 34 %t1 = phi i64 [ 0, %entry ], [ %t5, %bb7 ] 35 %t2 = add i64 %t1, 1 36 %t3 = icmp ult i64 0, %t2 37 br i1 %t3, label %bb3, label %bb4 38 39bb3: 40 %t4 = call i64 @f() 41 br label %bb4 42 43bb4: 44 %foo = phi i64 [ %t4, %bb3 ], [ 0, %bb2 ] 45 br i1 %p, label %bb5, label %bb6 46 47bb5: 48 br i1 true, label %bb7, label %bb7 49 50bb6: 51 br i1 true, label %bb7, label %bb7 52 53bb7: 54 %t5 = add i64 %t1, 1 55 br i1 %p, label %bb2, label %bb8 56 57bb8: 58 ret void 59} 60 61declare i64 @f() 62