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
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
| ; RUN: opt -instcombine -S < %s | FileCheck %s
;
; void func(long n, double A[static const restrict n]) {
; for (int i = 0; i < n; i+=1)
; for (int j = 0; j < n;j+=1)
; for (int k = 0; k < n; k += 1)
; for (int l = 0; l < n; l += 1) {
; double *p = &A[i + j + k + l];
; double x = *p;
; double y = *p;
; arg(x + y);
; }
; }
;
; Check for correctly merging access group metadata for instcombine
; (only common loops are parallel == intersection)
; Note that combined load would be parallel to loop !16 since both
; origin loads are parallel to it, but it references two access groups
; (!8 and !9), neither of which contain both loads. As such, the
; information that the combined load is parallel to !16 is lost.
;
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
declare void @arg(double)
define void @func(i64 %n, double* noalias nonnull %A) {
entry:
br label %for.cond
for.cond:
%i.0 = phi i32 [ 0, %entry ], [ %add31, %for.inc30 ]
%conv = sext i32 %i.0 to i64
%cmp = icmp slt i64 %conv, %n
br i1 %cmp, label %for.cond2, label %for.end32
for.cond2:
%j.0 = phi i32 [ %add28, %for.inc27 ], [ 0, %for.cond ]
%conv3 = sext i32 %j.0 to i64
%cmp4 = icmp slt i64 %conv3, %n
br i1 %cmp4, label %for.cond8, label %for.inc30
for.cond8:
%k.0 = phi i32 [ %add25, %for.inc24 ], [ 0, %for.cond2 ]
%conv9 = sext i32 %k.0 to i64
%cmp10 = icmp slt i64 %conv9, %n
br i1 %cmp10, label %for.cond14, label %for.inc27
for.cond14:
%l.0 = phi i32 [ %add23, %for.body19 ], [ 0, %for.cond8 ]
%conv15 = sext i32 %l.0 to i64
%cmp16 = icmp slt i64 %conv15, %n
br i1 %cmp16, label %for.body19, label %for.inc24
for.body19:
%add = add nsw i32 %i.0, %j.0
%add20 = add nsw i32 %add, %k.0
%add21 = add nsw i32 %add20, %l.0
%idxprom = sext i32 %add21 to i64
%arrayidx = getelementptr inbounds double, double* %A, i64 %idxprom
%0 = load double, double* %arrayidx, align 8, !llvm.access.group !1
%1 = load double, double* %arrayidx, align 8, !llvm.access.group !2
%add22 = fadd double %0, %1
call void @arg(double %add22), !llvm.access.group !3
%add23 = add nsw i32 %l.0, 1
br label %for.cond14, !llvm.loop !11
for.inc24:
%add25 = add nsw i32 %k.0, 1
br label %for.cond8, !llvm.loop !14
for.inc27:
%add28 = add nsw i32 %j.0, 1
br label %for.cond2, !llvm.loop !16
for.inc30:
%add31 = add nsw i32 %i.0, 1
br label %for.cond, !llvm.loop !18
for.end32:
ret void
}
; access groups
!7 = distinct !{}
!8 = distinct !{}
!9 = distinct !{}
; access group lists
!1 = !{!7, !9}
!2 = !{!7, !8}
!3 = !{!7, !8, !9}
!11 = distinct !{!11, !13}
!13 = !{!"llvm.loop.parallel_accesses", !7}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.parallel_accesses", !8}
!16 = distinct !{!16, !17}
!17 = !{!"llvm.loop.parallel_accesses", !8, !9}
!18 = distinct !{!18, !19}
!19 = !{!"llvm.loop.parallel_accesses", !9}
; CHECK: load double, {{.*}} !llvm.access.group ![[ACCESSGROUP_0:[0-9]+]]
; CHECK: br label %for.cond14, !llvm.loop ![[LOOP_4:[0-9]+]]
; CHECK: ![[ACCESSGROUP_0]] = distinct !{}
; CHECK: ![[LOOP_4]] = distinct !{![[LOOP_4]], ![[PARALLEL_ACCESSES_5:[0-9]+]]}
; CHECK: ![[PARALLEL_ACCESSES_5]] = !{!"llvm.loop.parallel_accesses", ![[ACCESSGROUP_0]]}
|