1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt < %s -passes=instcombine -S | FileCheck %s
4 ; Verify that strchr calls with a string consisting of one or two sequences
5 ; of all the same characters are folded and those with mixed strings are not.
7 @s1 = constant [2 x i8] c"\01\00"
8 @s11 = constant [3 x i8] c"\01\01\00"
9 @s111 = constant [4 x i8] c"\01\01\01\00"
10 @s000 = constant [4 x i8] c"\00\00\00\00"
11 @s11102 = constant [6 x i8] c"\01\01\01\00\02\00"
12 @s21111 = constant [6 x i8] c"\02\01\01\01\01\00"
14 declare ptr @strchr(ptr, i32)
17 ; Fold strchr(S = "\01", C) to C == '\01' ? S : C == '\0' ? S + 1 : null.
19 define ptr @fold_strchr_s1_C(i32 %C) {
20 ; CHECK-LABEL: @fold_strchr_s1_C(
21 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8
22 ; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], 0
23 ; CHECK-NEXT: [[MEMCHR_SEL1:%.*]] = select i1 [[TMP2]], ptr getelementptr inbounds (i8, ptr @s1, i64 1), ptr null
24 ; CHECK-NEXT: [[TMP3:%.*]] = icmp eq i8 [[TMP1]], 1
25 ; CHECK-NEXT: [[MEMCHR_SEL2:%.*]] = select i1 [[TMP3]], ptr @s1, ptr [[MEMCHR_SEL1]]
26 ; CHECK-NEXT: ret ptr [[MEMCHR_SEL2]]
28 %ret = call ptr @strchr(ptr @s1, i32 %C)
33 ; Fold strchr(S = "\01\01", C) to C == '\01' ? S : C == '\0' ? S + 2 : null.
35 define ptr @fold_strchr_s11_C(i32 %C) {
36 ; CHECK-LABEL: @fold_strchr_s11_C(
37 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8
38 ; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], 0
39 ; CHECK-NEXT: [[MEMCHR_SEL1:%.*]] = select i1 [[TMP2]], ptr getelementptr inbounds (i8, ptr @s11, i64 2), ptr null
40 ; CHECK-NEXT: [[TMP3:%.*]] = icmp eq i8 [[TMP1]], 1
41 ; CHECK-NEXT: [[MEMCHR_SEL2:%.*]] = select i1 [[TMP3]], ptr @s11, ptr [[MEMCHR_SEL1]]
42 ; CHECK-NEXT: ret ptr [[MEMCHR_SEL2]]
44 %ret = call ptr @strchr(ptr @s11, i32 %C)
49 ; Fold strchr(S = "\01\01\01", C) to C == '\01' ? S : C == '\0' ? S + 3 : null.
51 define ptr @fold_strchr_s111_C(i32 %C) {
52 ; CHECK-LABEL: @fold_strchr_s111_C(
53 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8
54 ; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], 0
55 ; CHECK-NEXT: [[MEMCHR_SEL1:%.*]] = select i1 [[TMP2]], ptr getelementptr inbounds (i8, ptr @s111, i64 3), ptr null
56 ; CHECK-NEXT: [[TMP3:%.*]] = icmp eq i8 [[TMP1]], 1
57 ; CHECK-NEXT: [[MEMCHR_SEL2:%.*]] = select i1 [[TMP3]], ptr @s111, ptr [[MEMCHR_SEL1]]
58 ; CHECK-NEXT: ret ptr [[MEMCHR_SEL2]]
60 %ret = call ptr @strchr(ptr @s111, i32 %C)
65 ; Fold strchr(S = "\00\00\00", C) to C == '\0' ? S : null.
67 define ptr @fold_strchr_s000_C(i32 %C) {
68 ; CHECK-LABEL: @fold_strchr_s000_C(
69 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8
70 ; CHECK-NEXT: [[MEMCHR_CHAR0CMP:%.*]] = icmp eq i8 [[TMP1]], 0
71 ; CHECK-NEXT: [[MEMCHR_SEL:%.*]] = select i1 [[MEMCHR_CHAR0CMP]], ptr @s000, ptr null
72 ; CHECK-NEXT: ret ptr [[MEMCHR_SEL]]
74 %ret = call ptr @strchr(ptr @s000, i32 %C)
79 ; Do not fold strchr(S = "\02\01\01\01\01", C). It's transformed to
82 define ptr @xform_strchr_s21111_C(i32 %C) {
83 ; CHECK-LABEL: @xform_strchr_s21111_C(
84 ; CHECK-NEXT: [[MEMCHR:%.*]] = call ptr @memchr(ptr noundef nonnull dereferenceable(1) @s21111, i32 [[C:%.*]], i64 6)
85 ; CHECK-NEXT: ret ptr [[MEMCHR]]
87 %ret = call ptr @strchr(ptr @s21111, i32 %C)
92 ; Fold strchr(S = "\02\01\01\01\01" + 1, C) to
93 ; C == '\01' ? S + 1 : C == '\0' ? S + 5 : null.
95 define ptr @fold_strchr_s21111p1_C(i32 %C) {
96 ; CHECK-LABEL: @fold_strchr_s21111p1_C(
97 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8
98 ; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], 0
99 ; CHECK-NEXT: [[MEMCHR_SEL1:%.*]] = select i1 [[TMP2]], ptr getelementptr inbounds (i8, ptr @s21111, i64 5), ptr null
100 ; CHECK-NEXT: [[TMP3:%.*]] = icmp eq i8 [[TMP1]], 1
101 ; CHECK-NEXT: [[MEMCHR_SEL2:%.*]] = select i1 [[TMP3]], ptr getelementptr inbounds (i8, ptr @s21111, i64 1), ptr [[MEMCHR_SEL1]]
102 ; CHECK-NEXT: ret ptr [[MEMCHR_SEL2]]
104 %ptr = getelementptr inbounds [6 x i8], ptr @s21111, i64 0, i64 1
105 %ret = call ptr @strchr(ptr %ptr, i32 %C)
109 ; Fold strchr(S = "\01\01\01\00\02", C) to
110 ; C == '\01' ? S : C == '\0' ? S + 3 : null.
112 define ptr @fold_strchr_s11102_C(i32 %C) {
113 ; CHECK-LABEL: @fold_strchr_s11102_C(
114 ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8
115 ; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], 0
116 ; CHECK-NEXT: [[MEMCHR_SEL1:%.*]] = select i1 [[TMP2]], ptr getelementptr inbounds (i8, ptr @s11102, i64 3), ptr null
117 ; CHECK-NEXT: [[TMP3:%.*]] = icmp eq i8 [[TMP1]], 1
118 ; CHECK-NEXT: [[MEMCHR_SEL2:%.*]] = select i1 [[TMP3]], ptr @s11102, ptr [[MEMCHR_SEL1]]
119 ; CHECK-NEXT: ret ptr [[MEMCHR_SEL2]]
121 %ret = call ptr @strchr(ptr @s11102, i32 %C)