1; RUN: opt -S -o - -basicaa -domtree -gvn %s | FileCheck %s
2
3target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
4
5%struct.S1 = type { i32, i32 }
6
7@a2 = common global i32* null, align 8
8@a = common global i32* null, align 8
9@s1 = common global %struct.S1 zeroinitializer, align 8
10
11; Check that GVN doesn't determine %2 is partially redundant.
12
13; CHECK-LABEL: define i32 @volatile_load
14; CHECK: for.body:
15; CHECK: %2 = load i32, i32*
16; CHECK: %3 = load volatile i32, i32*
17; CHECK: for.cond.for.end_crit_edge:
18
19define i32 @volatile_load(i32 %n) {
20entry:
21  %cmp6 = icmp sgt i32 %n, 0
22  br i1 %cmp6, label %for.body.lr.ph, label %for.end
23
24for.body.lr.ph:
25  %0 = load i32*, i32** @a2, align 8, !tbaa !1
26  %1 = load i32*, i32** @a, align 8, !tbaa !1
27  br label %for.body
28
29for.body:
30  %indvars.iv = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next, %for.body ]
31  %s.09 = phi i32 [ 0, %for.body.lr.ph ], [ %add, %for.body ]
32  %p.08 = phi i32* [ %0, %for.body.lr.ph ], [ %incdec.ptr, %for.body ]
33  %2 = load i32, i32* %p.08, align 4, !tbaa !5
34  %arrayidx = getelementptr inbounds i32, i32* %1, i64 %indvars.iv
35  store i32 %2, i32* %arrayidx, align 4, !tbaa !5
36  %3 = load volatile i32, i32* %p.08, align 4, !tbaa !5
37  %add = add nsw i32 %3, %s.09
38  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
39  %incdec.ptr = getelementptr inbounds i32, i32* %p.08, i64 1
40  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
41  %exitcond = icmp ne i32 %lftr.wideiv, %n
42  br i1 %exitcond, label %for.body, label %for.cond.for.end_crit_edge
43
44for.cond.for.end_crit_edge:
45  %add.lcssa = phi i32 [ %add, %for.body ]
46  br label %for.end
47
48for.end:
49  %s.0.lcssa = phi i32 [ %add.lcssa, %for.cond.for.end_crit_edge ], [ 0, %entry ]
50  ret i32 %s.0.lcssa
51}
52
53; %1 is partially redundant if %0 can be widened to a 64-bit load.
54
55; CHECK-LABEL: define i32 @overaligned_load
56; CHECK: if.end:
57; CHECK-NOT: %1 = load i32, i32*
58
59define i32 @overaligned_load(i32 %a, i32* nocapture %b) {
60entry:
61  %cmp = icmp sgt i32 %a, 0
62  br i1 %cmp, label %if.then, label %if.else
63
64if.then:
65  %0 = load i32, i32* getelementptr inbounds (%struct.S1, %struct.S1* @s1, i64 0, i32 0), align 8, !tbaa !5
66  br label %if.end
67
68if.else:
69  %arrayidx = getelementptr inbounds i32, i32* %b, i64 2
70  store i32 10, i32* %arrayidx, align 4, !tbaa !5
71  br label %if.end
72
73if.end:
74  %i.0 = phi i32 [ %0, %if.then ], [ 0, %if.else ]
75  %p.0 = phi i32* [ getelementptr inbounds (%struct.S1, %struct.S1* @s1, i64 0, i32 0), %if.then ], [ %b, %if.else ]
76  %add.ptr = getelementptr inbounds i32, i32* %p.0, i64 1
77  %1 = load i32, i32* %add.ptr, align 4, !tbaa !5
78  %add1 = add nsw i32 %1, %i.0
79  ret i32 %add1
80}
81
82!1 = !{!2, !2, i64 0}
83!2 = !{!"any pointer", !3, i64 0}
84!3 = !{!"omnipotent char", !4, i64 0}
85!4 = !{!"Simple C/C++ TBAA"}
86!5 = !{!6, !6, i64 0}
87!6 = !{!"int", !3, i64 0}
88