1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -passes=instcombine -S | FileCheck %s 3; 4; Verify that the result of strchr calls used in equality expressions 5; with either the first argument or null are optimally folded. 6 7declare ptr @strchr(ptr, i32) 8 9 10; Fold strchr(s, c) == s to *s == c. 11 12define i1 @fold_strchr_s_c_eq_s(ptr %s, i32 %c) { 13; CHECK-LABEL: @fold_strchr_s_c_eq_s( 14; CHECK-NEXT: [[TMP1:%.*]] = load i8, ptr [[S:%.*]], align 1 15; CHECK-NEXT: [[TMP2:%.*]] = trunc i32 [[C:%.*]] to i8 16; CHECK-NEXT: [[CHAR0CMP:%.*]] = icmp eq i8 [[TMP1]], [[TMP2]] 17; CHECK-NEXT: ret i1 [[CHAR0CMP]] 18; 19 %p = call ptr @strchr(ptr %s, i32 %c) 20 %cmp = icmp eq ptr %p, %s 21 ret i1 %cmp 22} 23 24 25; Fold strchr(s, c) != s to *s != c. 26 27define i1 @fold_strchr_s_c_neq_s(ptr %s, i32 %c) { 28; CHECK-LABEL: @fold_strchr_s_c_neq_s( 29; CHECK-NEXT: [[TMP1:%.*]] = load i8, ptr [[S:%.*]], align 1 30; CHECK-NEXT: [[TMP2:%.*]] = trunc i32 [[C:%.*]] to i8 31; CHECK-NEXT: [[CHAR0CMP:%.*]] = icmp ne i8 [[TMP1]], [[TMP2]] 32; CHECK-NEXT: ret i1 [[CHAR0CMP]] 33; 34 %p = call ptr @strchr(ptr %s, i32 %c) 35 %cmp = icmp ne ptr %p, %s 36 ret i1 %cmp 37} 38 39 40; Fold strchr(s, '\0') == null to false. (A string must be nul-terminated, 41; otherwise the call would read past the end of the array.) 42 43define i1 @fold_strchr_s_nul_eqz(ptr %s) { 44; CHECK-LABEL: @fold_strchr_s_nul_eqz( 45; CHECK-NEXT: ret i1 false 46; 47 %p = call ptr @strchr(ptr %s, i32 0) 48 %cmp = icmp eq ptr %p, null 49 ret i1 %cmp 50} 51 52 53; Fold strchr(s, '\0') != null to true. 54 55define i1 @fold_strchr_s_nul_nez(ptr %s) { 56; CHECK-LABEL: @fold_strchr_s_nul_nez( 57; CHECK-NEXT: ret i1 true 58; 59 %p = call ptr @strchr(ptr %s, i32 0) 60 %cmp = icmp ne ptr %p, null 61 ret i1 %cmp 62} 63 64 65@a5 = constant [5 x i8] c"12345"; 66 67; Fold strchr(a5, c) == a5 to *a5 == c. 68 69define i1 @fold_strchr_a_c_eq_a(i32 %c) { 70; CHECK-LABEL: @fold_strchr_a_c_eq_a( 71; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8 72; CHECK-NEXT: [[CHAR0CMP:%.*]] = icmp eq i8 [[TMP1]], 49 73; CHECK-NEXT: ret i1 [[CHAR0CMP]] 74; 75 %q = call ptr @strchr(ptr @a5, i32 %c) 76 %cmp = icmp eq ptr %q, @a5 77 ret i1 %cmp 78} 79