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