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
|
; RUN: opt -passes=called-value-propagation -S < %s | FileCheck %s
target triple = "aarch64"
; This test checks that we propagate the functions through arguments and attach
; !callees metadata to the call. Such metadata can enable optimizations of this
; code sequence.
;
; For example, the code below a illustrates a contrived sort-like algorithm
; that accepts a pointer to a comparison function. Since the indirect call to
; the comparison function has only two targets, the call can be promoted to two
; direct calls using an if-then-else. The loop can then be unswitched and the
; called functions inlined. This essentially produces two loops, once
; specialized for each comparison.
;
; CHECK: %tmp3 = call i1 %cmp(ptr %tmp1, ptr %tmp2), !callees ![[MD:[0-9]+]]
; CHECK: ![[MD]] = !{ptr @ugt, ptr @ule}
;
define void @test_argument(ptr %x, i64 %n, i1 %flag) {
entry:
%tmp0 = sub i64 %n, 1
br i1 %flag, label %then, label %else
then:
call void @arrange_data(ptr %x, i64 %tmp0, ptr @ugt)
br label %merge
else:
call void @arrange_data(ptr %x, i64 %tmp0, ptr @ule)
br label %merge
merge:
ret void
}
define internal void @arrange_data(ptr %x, i64 %n, ptr %cmp) {
entry:
%tmp0 = icmp eq i64 %n, 1
br i1 %tmp0, label %merge, label %for.body
for.body:
%i = phi i64 [ 0, %entry ], [ %i.next, %cmp.false ]
%i.next = add nuw nsw i64 %i, 1
%tmp1 = getelementptr inbounds i64, ptr %x, i64 %i
%tmp2 = getelementptr inbounds i64, ptr %x, i64 %i.next
%tmp3 = call i1 %cmp(ptr %tmp1, ptr %tmp2)
br i1 %tmp3, label %cmp.true, label %cmp.false
cmp.true:
call void @swap(ptr %tmp1, ptr %tmp2)
br label %cmp.false
cmp.false:
%cond = icmp slt i64 %i.next, %n
br i1 %cond, label %for.body, label %for.end
for.end:
%tmp4 = sub i64 %n, 1
call void @arrange_data(ptr %x, i64 %tmp4, ptr %cmp)
br label %merge
merge:
ret void
}
define internal i1 @ugt(ptr %a, ptr %b) {
entry:
%tmp0 = load i64, ptr %a
%tmp1 = load i64, ptr %b
%tmp2 = icmp ugt i64 %tmp0, %tmp1
ret i1 %tmp2
}
define internal i1 @ule(ptr %a, ptr %b) {
entry:
%tmp0 = load i64, ptr %a
%tmp1 = load i64, ptr %b
%tmp2 = icmp ule i64 %tmp0, %tmp1
ret i1 %tmp2
}
declare void @swap(ptr, ptr)
|
