ptr-diff.ll
4.13 KB
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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
; RUN: opt -inline < %s -S -o - -inline-threshold=10 | FileCheck %s
target datalayout = "p:32:32-p1:64:64-p2:16:16-n16:32:64"
define i32 @outer1() {
; CHECK-LABEL: @outer1(
; CHECK-NOT: call i32
; CHECK: ret i32
%ptr = alloca i32
%ptr1 = getelementptr inbounds i32, i32* %ptr, i32 0
%ptr2 = getelementptr inbounds i32, i32* %ptr, i32 42
%result = call i32 @inner1(i32* %ptr1, i32* %ptr2)
ret i32 %result
}
define i32 @inner1(i32* %begin, i32* %end) {
call void @extern()
%begin.i = ptrtoint i32* %begin to i32
%end.i = ptrtoint i32* %end to i32
%distance = sub i32 %end.i, %begin.i
%icmp = icmp sle i32 %distance, 42
br i1 %icmp, label %then, label %else
then:
ret i32 3
else:
%t = load i32, i32* %begin
ret i32 %t
}
define i32 @outer1_as1(i32 addrspace(1)* %ptr) {
; CHECK-LABEL: @outer1_as1(
; CHECK-NOT: call
; CHECK: ret i32
%ptr1 = getelementptr inbounds i32, i32 addrspace(1)* %ptr, i32 0
%ptr2 = getelementptr inbounds i32, i32 addrspace(1)* %ptr, i32 42
%result = call i32 @inner1_as1(i32 addrspace(1)* %ptr1, i32 addrspace(1)* %ptr2)
ret i32 %result
}
; Make sure that the address space's larger size makes the ptrtoints
; not no-ops preventing inlining
define i32 @inner1_as1(i32 addrspace(1)* %begin, i32 addrspace(1)* %end) {
%begin.i = ptrtoint i32 addrspace(1)* %begin to i32
%end.i = ptrtoint i32 addrspace(1)* %end to i32
%distance = sub i32 %end.i, %begin.i
%icmp = icmp sle i32 %distance, 42
br i1 %icmp, label %then, label %else
then:
ret i32 3
else:
%t = load i32, i32 addrspace(1)* %begin
ret i32 %t
}
define i32 @outer2(i32* %ptr) {
; Test that an inbounds GEP disables this -- it isn't safe in general as
; wrapping changes the behavior of lessthan and greaterthan comparisons.
; CHECK-LABEL: @outer2(
; CHECK: call i32 @inner2
; CHECK: ret i32
%ptr1 = getelementptr i32, i32* %ptr, i32 0
%ptr2 = getelementptr i32, i32* %ptr, i32 42
%result = call i32 @inner2(i32* %ptr1, i32* %ptr2)
ret i32 %result
}
define i32 @inner2(i32* %begin, i32* %end) {
call void @extern()
%begin.i = ptrtoint i32* %begin to i32
%end.i = ptrtoint i32* %end to i32
%distance = sub i32 %end.i, %begin.i
%icmp = icmp sle i32 %distance, 42
br i1 %icmp, label %then, label %else
then:
ret i32 3
else:
%t = load i32, i32* %begin
ret i32 %t
}
define i32 @outer3(i16* addrspace(1)* %ptr) {
; CHECK-LABEL: @outer3(
; CHECK-NOT: call i32
; CHECK: ret i32 3
; CHECK-LABEL: @inner3(
%result = call i32 @inner3(i16* addrspace(1)* %ptr)
ret i32 %result
}
define i32 @inner3(i16* addrspace(1)* %ptr) {
call void @extern()
%ptr.i = ptrtoint i16* addrspace(1)* %ptr to i64
%distance = sub i64 %ptr.i, %ptr.i
%icmp = icmp eq i64 %distance, 0
br i1 %icmp, label %then, label %else
then:
ret i32 3
else:
ret i32 5
}
; The inttoptrs are free since it is a smaller integer to a larger
; pointer size
define i32 @inttoptr_free_cost(i32 %a, i32 %b, i32 %c) {
call void @extern()
%p1 = inttoptr i32 %a to i32 addrspace(1)*
%p2 = inttoptr i32 %b to i32 addrspace(1)*
%p3 = inttoptr i32 %c to i32 addrspace(1)*
%t1 = load i32, i32 addrspace(1)* %p1
%t2 = load i32, i32 addrspace(1)* %p2
%t3 = load i32, i32 addrspace(1)* %p3
%s = add i32 %t1, %t2
%s1 = add i32 %s, %t3
ret i32 %s1
}
define i32 @inttoptr_free_cost_user(i32 %begin, i32 %end) {
; CHECK-LABEL: @inttoptr_free_cost_user(
; CHECK-NOT: call i32
%x = call i32 @inttoptr_free_cost(i32 %begin, i32 %end, i32 9)
ret i32 %x
}
; The inttoptrs have a cost since it is a larger integer to a smaller
; pointer size
define i32 @inttoptr_cost_smaller_ptr(i32 %a, i32 %b, i32 %c) {
call void @extern()
%p1 = inttoptr i32 %a to i32 addrspace(2)*
%p2 = inttoptr i32 %b to i32 addrspace(2)*
%p3 = inttoptr i32 %c to i32 addrspace(2)*
%t1 = load i32, i32 addrspace(2)* %p1
%t2 = load i32, i32 addrspace(2)* %p2
%t3 = load i32, i32 addrspace(2)* %p3
%s = add i32 %t1, %t2
%s1 = add i32 %s, %t3
ret i32 %s1
}
define i32 @inttoptr_cost_smaller_ptr_user(i32 %begin, i32 %end) {
; CHECK-LABEL: @inttoptr_cost_smaller_ptr_user(
; CHECK: call i32
%x = call i32 @inttoptr_cost_smaller_ptr(i32 %begin, i32 %end, i32 9)
ret i32 %x
}
declare void @extern()