1; RUN: opt < %s -simplifycfg -S | FileCheck %s
2
3; In PR17073 ( http://llvm.org/pr17073 ), we illegally hoisted an operation that can trap.
4; The first test confirms that we don't do that when the trapping op is reached by the current BB (block1).
5; The second test confirms that we don't do that when the trapping op is reached by the previous BB (entry).
6; The third test confirms that we can still do this optimization for an operation (add) that doesn't trap.
7; The tests must be complicated enough to prevent previous SimplifyCFG actions from optimizing away
8; the instructions that we're checking for.
9
10target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
11target triple = "i386-apple-macosx10.9.0"
12
13@a = common global i32 0, align 4
14@b = common global i8 0, align 1
15
16; CHECK-LABEL: can_trap1
17; CHECK-NOT: or i1 %tobool, icmp eq (i32* bitcast (i8* @b to i32*), i32* @a)
18; CHECK-NOT: select i1 %tobool, i32* null, i32* select (i1 icmp eq (i64 urem (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a)
19define i32* @can_trap1() {
20entry:
21  %0 = load i32, i32* @a, align 4
22  %tobool = icmp eq i32 %0, 0
23  br i1 %tobool, label %exit, label %block1
24
25block1:
26  br i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a), label %exit, label %block2
27
28block2:
29  br label %exit
30
31exit:
32  %storemerge = phi i32* [ null, %entry ],[ null, %block2 ], [ select (i1 icmp eq (i64 urem (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a), %block1 ]
33  ret i32* %storemerge
34}
35
36; CHECK-LABEL: can_trap2
37; CHECK-NOT: or i1 %tobool, icmp eq (i32* bitcast (i8* @b to i32*), i32* @a)
38; CHECK-NOT: select i1 %tobool, i32* select (i1 icmp eq (i64 urem (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a), i32* null
39define i32* @can_trap2() {
40entry:
41  %0 = load i32, i32* @a, align 4
42  %tobool = icmp eq i32 %0, 0
43  br i1 %tobool, label %exit, label %block1
44
45block1:
46  br i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a), label %exit, label %block2
47
48block2:
49  br label %exit
50
51exit:
52  %storemerge = phi i32* [ select (i1 icmp eq (i64 urem (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a), %entry ],[ null, %block2 ], [ null, %block1 ]
53  ret i32* %storemerge
54}
55
56; CHECK-LABEL: cannot_trap
57; CHECK: select i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a), i32* select (i1 icmp eq (i64 add (i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64), i64 2), i64 0), i32* null, i32* @a), i32* null
58define i32* @cannot_trap() {
59entry:
60  %0 = load i32, i32* @a, align 4
61  %tobool = icmp eq i32 %0, 0
62  br i1 %tobool, label %exit, label %block1
63
64block1:
65  br i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a), label %exit, label %block2
66
67block2:
68  br label %exit
69
70exit:
71  %storemerge = phi i32* [ null, %entry ],[ null, %block2 ], [ select (i1 icmp eq (i64 add (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a), %block1 ]
72  ret i32* %storemerge
73}
74