1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -passes=gvn -S | FileCheck %s 3 4; This test checks that we don't hang trying to split a critical edge in loadpre 5; when the control flow uses a callbr instruction. 6 7%struct.pluto = type <{ i8, i8 }> 8 9define void @widget(ptr %tmp1) { 10; CHECK-LABEL: @widget( 11; CHECK-NEXT: bb: 12; CHECK-NEXT: callbr void asm sideeffect "", "!i,!i"() 13; CHECK-NEXT: to label [[BB4:%.*]] [label [[BB5:%.*]], label %bb.bb8_crit_edge] 14; CHECK: bb.bb8_crit_edge: 15; CHECK-NEXT: [[TMP10_PRE:%.*]] = load ptr, ptr [[TMP1:%.*]], align 8 16; CHECK-NEXT: br label [[BB8:%.*]] 17; CHECK: bb4: 18; CHECK-NEXT: br label [[BB5]] 19; CHECK: bb5: 20; CHECK-NEXT: [[TMP6:%.*]] = load ptr, ptr [[TMP1]], align 8 21; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds [[STRUCT_PLUTO:%.*]], ptr [[TMP6]], i64 0, i32 1 22; CHECK-NEXT: br label [[BB8]] 23; CHECK: bb8: 24; CHECK-NEXT: [[TMP10:%.*]] = phi ptr [ [[TMP6]], [[BB5]] ], [ [[TMP10_PRE]], [[BB_BB8_CRIT_EDGE:%.*]] ] 25; CHECK-NEXT: [[TMP9:%.*]] = phi ptr [ [[TMP7]], [[BB5]] ], [ null, [[BB_BB8_CRIT_EDGE]] ] 26; CHECK-NEXT: [[TMP12:%.*]] = load i8, ptr [[TMP10]], align 1 27; CHECK-NEXT: tail call void @spam(ptr [[TMP9]], i8 [[TMP12]]) 28; CHECK-NEXT: ret void 29; 30bb: 31 callbr void asm sideeffect "", "!i,!i"() 32 to label %bb4 [label %bb5, label %bb8] 33 34bb4: ; preds = %bb 35 br label %bb5 36 37bb5: ; preds = %bb4, %bb 38 %tmp6 = load ptr, ptr %tmp1 39 %tmp7 = getelementptr inbounds %struct.pluto, ptr %tmp6, i64 0, i32 1 40 br label %bb8 41 42bb8: ; preds = %bb5, %bb 43 %tmp9 = phi ptr [ %tmp7, %bb5 ], [ null, %bb ] 44 %tmp10 = load ptr, ptr %tmp1 45 %tmp12 = load i8, ptr %tmp10 46 tail call void @spam(ptr %tmp9, i8 %tmp12) 47 ret void 48} 49 50declare void @spam(ptr, i8) 51