1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt < %s -passes=gvn -S | FileCheck %s
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.
7 %struct.pluto = type <{ i8, i8 }>
9 define void @widget(ptr %tmp1) {
10 ; CHECK-LABEL: @widget(
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:%.*]]
18 ; CHECK-NEXT: br label [[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]]
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
31 callbr void asm sideeffect "", "!i,!i"()
32 to label %bb4 [label %bb5, label %bb8]
37 bb5: ; preds = %bb4, %bb
38 %tmp6 = load ptr, ptr %tmp1
39 %tmp7 = getelementptr inbounds %struct.pluto, ptr %tmp6, i64 0, i32 1
42 bb8: ; 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)
50 declare void @spam(ptr, i8)