1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; Test that the memchr library call simplifier works correctly.
3 ; RUN: opt < %s -instcombine -S | FileCheck %s
5 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"
7 @hello = constant [14 x i8] c"hello world\5Cn\00"
8 @hellonull = constant [14 x i8] c"hello\00world\5Cn\00"
9 @null = constant [1 x i8] zeroinitializer
10 @newlines = constant [3 x i8] c"\0D\0A\00"
11 @single = constant [2 x i8] c"\1F\00"
12 @spaces = constant [4 x i8] c" \0D\0A\00"
13 @negative = constant [3 x i8] c"\FF\FE\00"
14 @chp = global i8* zeroinitializer
16 declare i8* @memchr(i8*, i32, i32)
18 define void @test1() {
19 ; CHECK-LABEL: @test1(
20 ; CHECK-NEXT: store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 6), i8** @chp, align 4
21 ; CHECK-NEXT: ret void
23 %str = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
24 %dst = call i8* @memchr(i8* %str, i32 119, i32 14)
25 store i8* %dst, i8** @chp
29 define void @test2() {
30 ; CHECK-LABEL: @test2(
31 ; CHECK-NEXT: store i8* null, i8** @chp, align 4
32 ; CHECK-NEXT: ret void
34 %str = getelementptr [1 x i8], [1 x i8]* @null, i32 0, i32 0
35 %dst = call i8* @memchr(i8* %str, i32 119, i32 1)
36 store i8* %dst, i8** @chp
40 define void @test3() {
41 ; CHECK-LABEL: @test3(
42 ; CHECK-NEXT: store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 13), i8** @chp, align 4
43 ; CHECK-NEXT: ret void
45 %src = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
46 %dst = call i8* @memchr(i8* %src, i32 0, i32 14)
47 store i8* %dst, i8** @chp
51 define void @test4(i32 %chr) {
52 ; CHECK-LABEL: @test4(
53 ; CHECK-NEXT: [[DST:%.*]] = call i8* @memchr(i8* noundef nonnull dereferenceable(14) getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 0), i32 [[CHR:%.*]], i32 14)
54 ; CHECK-NEXT: store i8* [[DST]], i8** @chp, align 4
55 ; CHECK-NEXT: ret void
57 %src = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
58 %dst = call i8* @memchr(i8* %src, i32 %chr, i32 14)
59 store i8* %dst, i8** @chp
63 define void @test5() {
64 ; CHECK-LABEL: @test5(
65 ; CHECK-NEXT: store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 13), i8** @chp, align 4
66 ; CHECK-NEXT: ret void
68 %src = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
69 %dst = call i8* @memchr(i8* %src, i32 65280, i32 14)
70 store i8* %dst, i8** @chp
74 define void @test6() {
75 ; CHECK-LABEL: @test6(
76 ; CHECK-NEXT: store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hello, i32 0, i32 6), i8** @chp, align 4
77 ; CHECK-NEXT: ret void
79 %src = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
80 ; Overflow, but we still find the right thing.
81 %dst = call i8* @memchr(i8* %src, i32 119, i32 100)
82 store i8* %dst, i8** @chp
86 define void @test7() {
87 ; CHECK-LABEL: @test7(
88 ; CHECK-NEXT: store i8* null, i8** @chp, align 4
89 ; CHECK-NEXT: ret void
91 %src = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
93 %dst = call i8* @memchr(i8* %src, i32 120, i32 100)
94 store i8* %dst, i8** @chp
98 define void @test8() {
99 ; CHECK-LABEL: @test8(
100 ; CHECK-NEXT: store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hellonull, i32 0, i32 6), i8** @chp, align 4
101 ; CHECK-NEXT: ret void
103 %str = getelementptr [14 x i8], [14 x i8]* @hellonull, i32 0, i32 0
104 %dst = call i8* @memchr(i8* %str, i32 119, i32 14)
105 store i8* %dst, i8** @chp
109 define void @test9() {
110 ; CHECK-LABEL: @test9(
111 ; CHECK-NEXT: store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @hellonull, i32 0, i32 6), i8** @chp, align 4
112 ; CHECK-NEXT: ret void
114 %str = getelementptr [14 x i8], [14 x i8]* @hellonull, i32 0, i32 2
115 %dst = call i8* @memchr(i8* %str, i32 119, i32 12)
116 store i8* %dst, i8** @chp
120 define void @test10() {
121 ; CHECK-LABEL: @test10(
122 ; CHECK-NEXT: store i8* null, i8** @chp, align 4
123 ; CHECK-NEXT: ret void
125 %str = getelementptr [14 x i8], [14 x i8]* @hello, i32 0, i32 0
126 %dst = call i8* @memchr(i8* %str, i32 119, i32 6)
127 store i8* %dst, i8** @chp
131 ; Check transformation memchr("\r\n", C, 2) != nullptr -> (C & 9216) != 0
132 define i1 @test11(i32 %C) {
133 ; CHECK-LABEL: @test11(
134 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i16
135 ; CHECK-NEXT: [[TMP2:%.*]] = and i16 [[TMP1]], 255
136 ; CHECK-NEXT: [[MEMCHR_BOUNDS:%.*]] = icmp ult i16 [[TMP2]], 16
137 ; CHECK-NEXT: [[TMP3:%.*]] = shl i16 1, [[TMP2]]
138 ; CHECK-NEXT: [[TMP4:%.*]] = and i16 [[TMP3]], 9216
139 ; CHECK-NEXT: [[MEMCHR_BITS:%.*]] = icmp ne i16 [[TMP4]], 0
140 ; CHECK-NEXT: [[MEMCHR:%.*]] = select i1 [[MEMCHR_BOUNDS]], i1 [[MEMCHR_BITS]], i1 false
141 ; CHECK-NEXT: ret i1 [[MEMCHR]]
143 %dst = call i8* @memchr(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @newlines, i64 0, i64 0), i32 %C, i32 2)
144 %cmp = icmp ne i8* %dst, null
149 define i1 @test12(i32 %C) {
150 ; CHECK-LABEL: @test12(
151 ; CHECK-NEXT: [[DST:%.*]] = call i8* @memchr(i8* noundef nonnull dereferenceable(3) getelementptr inbounds ([4 x i8], [4 x i8]* @spaces, i32 0, i32 0), i32 [[C:%.*]], i32 3)
152 ; CHECK-NEXT: [[CMP:%.*]] = icmp ne i8* [[DST]], null
153 ; CHECK-NEXT: ret i1 [[CMP]]
155 %dst = call i8* @memchr(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @spaces, i64 0, i64 0), i32 %C, i32 3)
156 %cmp = icmp ne i8* %dst, null
160 define i1 @test13(i32 %C) {
161 ; CHECK-LABEL: @test13(
162 ; CHECK-NEXT: [[TMP1:%.*]] = and i32 [[C:%.*]], 255
163 ; CHECK-NEXT: [[MEMCHR_BOUNDS:%.*]] = icmp ult i32 [[TMP1]], 32
164 ; CHECK-NEXT: [[TMP2:%.*]] = shl i32 1, [[TMP1]]
165 ; CHECK-NEXT: [[TMP3:%.*]] = and i32 [[TMP2]], -2147483647
166 ; CHECK-NEXT: [[MEMCHR_BITS:%.*]] = icmp ne i32 [[TMP3]], 0
167 ; CHECK-NEXT: [[MEMCHR:%.*]] = select i1 [[MEMCHR_BOUNDS]], i1 [[MEMCHR_BITS]], i1 false
168 ; CHECK-NEXT: ret i1 [[MEMCHR]]
170 %dst = call i8* @memchr(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @single, i64 0, i64 0), i32 %C, i32 2)
171 %cmp = icmp ne i8* %dst, null
175 define i1 @test14(i32 %C) {
176 ; CHECK-LABEL: @test14(
177 ; CHECK-NEXT: [[TMP1:%.*]] = and i32 [[C:%.*]], 255
178 ; CHECK-NEXT: [[MEMCHR_BITS:%.*]] = icmp eq i32 [[TMP1]], 31
179 ; CHECK-NEXT: ret i1 [[MEMCHR_BITS]]
181 %dst = call i8* @memchr(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @single, i64 0, i64 0), i32 %C, i32 1)
182 %cmp = icmp ne i8* %dst, null
186 define i1 @test15(i32 %C) {
187 ; CHECK-LABEL: @test15(
188 ; CHECK-NEXT: [[DST:%.*]] = call i8* @memchr(i8* noundef nonnull dereferenceable(3) getelementptr inbounds ([3 x i8], [3 x i8]* @negative, i32 0, i32 0), i32 [[C:%.*]], i32 3)
189 ; CHECK-NEXT: [[CMP:%.*]] = icmp ne i8* [[DST]], null
190 ; CHECK-NEXT: ret i1 [[CMP]]
192 %dst = call i8* @memchr(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @negative, i64 0, i64 0), i32 %C, i32 3)
193 %cmp = icmp ne i8* %dst, null
197 @s = internal constant [1 x i8] [i8 0], align 1
198 define i8* @pr32124() {
199 ; CHECK-LABEL: @pr32124(
200 ; CHECK-NEXT: ret i8* getelementptr inbounds ([1 x i8], [1 x i8]* @s, i32 0, i32 0)
202 %res = tail call i8* @memchr(i8* getelementptr ([1 x i8], [1 x i8]* @s, i64 0, i64 0), i32 0, i32 1)
206 define i8* @test16(i8* %str, i32 %c, i32 %n) {
207 ; CHECK-LABEL: @test16(
208 ; CHECK-NEXT: [[RET:%.*]] = call i8* @memchr(i8* [[STR:%.*]], i32 [[C:%.*]], i32 [[N:%.*]])
209 ; CHECK-NEXT: ret i8* [[RET]]
212 %ret = call i8* @memchr(i8* %str, i32 %c, i32 %n)
216 define i8* @test17(i8* %str, i32 %c, i32 %n) {
217 ; CHECK-LABEL: @test17(
218 ; CHECK-NEXT: [[RET:%.*]] = call i8* @memchr(i8* nonnull [[STR:%.*]], i32 [[C:%.*]], i32 [[N:%.*]])
219 ; CHECK-NEXT: ret i8* [[RET]]
222 %ret = call i8* @memchr(i8* nonnull %str, i32 %c, i32 %n)
226 define i8* @test18(i8* %str, i32 %c) {
227 ; CHECK-LABEL: @test18(
228 ; CHECK-NEXT: [[RET:%.*]] = call i8* @memchr(i8* noundef nonnull dereferenceable(5) [[STR:%.*]], i32 [[C:%.*]], i32 5)
229 ; CHECK-NEXT: ret i8* [[RET]]
232 %ret = call i8* @memchr(i8* %str, i32 %c, i32 5)
236 define i8* @test19(i8* %str, i32 %c) null_pointer_is_valid {
237 ; CHECK-LABEL: @test19(
238 ; CHECK-NEXT: [[RET:%.*]] = call i8* @memchr(i8* noundef dereferenceable(5) [[STR:%.*]], i32 [[C:%.*]], i32 5)
239 ; CHECK-NEXT: ret i8* [[RET]]
242 %ret = call i8* @memchr(i8* %str, i32 %c, i32 5)