File: wcslen-3.ll

package info (click to toggle)
llvm-toolchain-5.0 1:5.0.1-2~bpo9+1
  • links: PTS, VCS
  • area: main
  • in suites: stretch-backports
  • size: 553,688 kB
  • sloc: cpp: 2,878,786; ansic: 584,110; asm: 246,252; python: 124,751; objc: 106,925; sh: 21,542; lisp: 8,628; pascal: 5,885; ml: 5,544; perl: 5,312; makefile: 2,208; cs: 2,022; xml: 686; php: 212; csh: 117
file content (197 lines) | stat: -rw-r--r-- 6,540 bytes parent folder | download
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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; Test that the wcslen library call simplifier works correctly.
;
; RUN: opt < %s -instcombine -S | FileCheck %s

; Test behavior for wchar_size==2
!llvm.module.flags = !{!0}
!0 = !{i32 1, !"wchar_size", i32 2}

target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"

declare i64 @wcslen(i16*)

@hello = constant [6 x i16] [i16 104, i16 101, i16 108, i16 108, i16 111, i16 0]
@longer = constant [7 x i16] [i16 108, i16 111, i16 110, i16 103, i16 101, i16 114, i16 0]
@null = constant [1 x i16] zeroinitializer
@null_hello = constant [7 x i16] [i16 0, i16 104, i16 101, i16 108, i16 108, i16 111, i16 0]
@nullstring = constant i16 0
@a = common global [32 x i16] zeroinitializer, align 1
@null_hello_mid = constant [13 x i16] [i16 104, i16 101, i16 108, i16 108, i16 111, i16 32, i16 119, i16 111, i16 114, i16 0, i16 108, i16 100, i16 0]

define i64 @test_simplify1() {
; CHECK-LABEL: @test_simplify1(
; CHECK-NEXT:    ret i64 5
;
  %hello_p = getelementptr [6 x i16], [6 x i16]* @hello, i64 0, i64 0
  %hello_l = call i64 @wcslen(i16* %hello_p)
  ret i64 %hello_l
}

define i64 @test_simplify2() {
; CHECK-LABEL: @test_simplify2(
; CHECK-NEXT:    ret i64 0
;
  %null_p = getelementptr [1 x i16], [1 x i16]* @null, i64 0, i64 0
  %null_l = call i64 @wcslen(i16* %null_p)
  ret i64 %null_l
}

define i64 @test_simplify3() {
; CHECK-LABEL: @test_simplify3(
; CHECK-NEXT:    ret i64 0
;
  %null_hello_p = getelementptr [7 x i16], [7 x i16]* @null_hello, i64 0, i64 0
  %null_hello_l = call i64 @wcslen(i16* %null_hello_p)
  ret i64 %null_hello_l
}

define i64 @test_simplify4() {
; CHECK-LABEL: @test_simplify4(
; CHECK-NEXT:    ret i64 0
;
  %len = tail call i64 @wcslen(i16* @nullstring) nounwind
  ret i64 %len
}

; Check wcslen(x) == 0 --> *x == 0.

define i1 @test_simplify5() {
; CHECK-LABEL: @test_simplify5(
; CHECK-NEXT:    ret i1 false
;
  %hello_p = getelementptr [6 x i16], [6 x i16]* @hello, i64 0, i64 0
  %hello_l = call i64 @wcslen(i16* %hello_p)
  %eq_hello = icmp eq i64 %hello_l, 0
  ret i1 %eq_hello
}

define i1 @test_simplify6(i16* %str_p) {
; CHECK-LABEL: @test_simplify6(
; CHECK-NEXT:    [[STRLENFIRST:%.*]] = load i16, i16* [[STR_P:%.*]], align 2
; CHECK-NEXT:    [[EQ_NULL:%.*]] = icmp eq i16 [[STRLENFIRST]], 0
; CHECK-NEXT:    ret i1 [[EQ_NULL]]
;
  %str_l = call i64 @wcslen(i16* %str_p)
  %eq_null = icmp eq i64 %str_l, 0
  ret i1 %eq_null
}

; Check wcslen(x) != 0 --> *x != 0.

define i1 @test_simplify7() {
; CHECK-LABEL: @test_simplify7(
; CHECK-NEXT:    ret i1 true
;
  %hello_p = getelementptr [6 x i16], [6 x i16]* @hello, i64 0, i64 0
  %hello_l = call i64 @wcslen(i16* %hello_p)
  %ne_hello = icmp ne i64 %hello_l, 0
  ret i1 %ne_hello
}

define i1 @test_simplify8(i16* %str_p) {
; CHECK-LABEL: @test_simplify8(
; CHECK-NEXT:    [[STRLENFIRST:%.*]] = load i16, i16* [[STR_P:%.*]], align 2
; CHECK-NEXT:    [[NE_NULL:%.*]] = icmp ne i16 [[STRLENFIRST]], 0
; CHECK-NEXT:    ret i1 [[NE_NULL]]
;
  %str_l = call i64 @wcslen(i16* %str_p)
  %ne_null = icmp ne i64 %str_l, 0
  ret i1 %ne_null
}

define i64 @test_simplify9(i1 %x) {
; CHECK-LABEL: @test_simplify9(
; CHECK-NEXT:    [[TMP1:%.*]] = select i1 [[X:%.*]], i64 5, i64 6
; CHECK-NEXT:    ret i64 [[TMP1]]
;
  %hello = getelementptr [6 x i16], [6 x i16]* @hello, i64 0, i64 0
  %longer = getelementptr [7 x i16], [7 x i16]* @longer, i64 0, i64 0
  %s = select i1 %x, i16* %hello, i16* %longer
  %l = call i64 @wcslen(i16* %s)
  ret i64 %l
}

; Check the case that should be simplified to a sub instruction.
; wcslen(@hello + x) --> 5 - x

define i64 @test_simplify10(i16 %x) {
; CHECK-LABEL: @test_simplify10(
; CHECK-NEXT:    [[TMP1:%.*]] = sext i16 [[X:%.*]] to i64
; CHECK-NEXT:    [[TMP2:%.*]] = sub nsw i64 5, [[TMP1]]
; CHECK-NEXT:    ret i64 [[TMP2]]
;
  %hello_p = getelementptr inbounds [6 x i16], [6 x i16]* @hello, i16 0, i16 %x
  %hello_l = call i64 @wcslen(i16* %hello_p)
  ret i64 %hello_l
}

; wcslen(@null_hello_mid + (x & 7)) --> 9 - (x & 7)

define i64 @test_simplify11(i16 %x) {
; CHECK-LABEL: @test_simplify11(
; CHECK-NEXT:    [[AND:%.*]] = and i16 [[X:%.*]], 7
; CHECK-NEXT:    [[TMP1:%.*]] = zext i16 [[AND]] to i64
; CHECK-NEXT:    [[TMP2:%.*]] = sub nsw i64 9, [[TMP1]]
; CHECK-NEXT:    ret i64 [[TMP2]]
;
  %and = and i16 %x, 7
  %hello_p = getelementptr inbounds [13 x i16], [13 x i16]* @null_hello_mid, i16 0, i16 %and
  %hello_l = call i64 @wcslen(i16* %hello_p)
  ret i64 %hello_l
}

; Check cases that shouldn't be simplified.

define i64 @test_no_simplify1() {
; CHECK-LABEL: @test_no_simplify1(
; CHECK-NEXT:    [[A_L:%.*]] = call i64 @wcslen(i16* getelementptr inbounds ([32 x i16], [32 x i16]* @a, i64 0, i64 0))
; CHECK-NEXT:    ret i64 [[A_L]]
;
  %a_p = getelementptr [32 x i16], [32 x i16]* @a, i64 0, i64 0
  %a_l = call i64 @wcslen(i16* %a_p)
  ret i64 %a_l
}

; wcslen(@null_hello + x) should not be simplified to a sub instruction.

define i64 @test_no_simplify2(i16 %x) {
; CHECK-LABEL: @test_no_simplify2(
; CHECK-NEXT:    [[TMP1:%.*]] = sext i16 [[X:%.*]] to i64
; CHECK-NEXT:    [[HELLO_P:%.*]] = getelementptr inbounds [7 x i16], [7 x i16]* @null_hello, i64 0, i64 [[TMP1]]
; CHECK-NEXT:    [[HELLO_L:%.*]] = call i64 @wcslen(i16* [[HELLO_P]])
; CHECK-NEXT:    ret i64 [[HELLO_L]]
;
  %hello_p = getelementptr inbounds [7 x i16], [7 x i16]* @null_hello, i16 0, i16 %x
  %hello_l = call i64 @wcslen(i16* %hello_p)
  ret i64 %hello_l
}

; wcslen(@null_hello_mid + (x & 15)) should not be simplified to a sub instruction.

define i64 @test_no_simplify3(i16 %x) {
; CHECK-LABEL: @test_no_simplify3(
; CHECK-NEXT:    [[AND:%.*]] = and i16 [[X:%.*]], 15
; CHECK-NEXT:    [[TMP1:%.*]] = zext i16 [[AND]] to i64
; CHECK-NEXT:    [[HELLO_P:%.*]] = getelementptr inbounds [13 x i16], [13 x i16]* @null_hello_mid, i64 0, i64 [[TMP1]]
; CHECK-NEXT:    [[HELLO_L:%.*]] = call i64 @wcslen(i16* [[HELLO_P]])
; CHECK-NEXT:    ret i64 [[HELLO_L]]
;
  %and = and i16 %x, 15
  %hello_p = getelementptr inbounds [13 x i16], [13 x i16]* @null_hello_mid, i16 0, i16 %and
  %hello_l = call i64 @wcslen(i16* %hello_p)
  ret i64 %hello_l
}

@str32 = constant [1 x i32] [i32 0]

; This could in principle be simplified, but the current implementation bails on
; type mismatches.
define i64 @test_no_simplify4() {
; CHECK-LABEL: @test_no_simplify4(
; CHECK-NEXT:    [[L:%.*]] = call i64 @wcslen(i16* bitcast ([1 x i32]* @str32 to i16*))
; CHECK-NEXT:    ret i64 [[L]]
;
  %l = call i64 @wcslen(i16* bitcast ([1 x i32]* @str32 to i16*))
  ret i64 %l
}