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 memrchr calls with an out of bounds size are not folded to 5; null (they might be intercepted by sanitizers). 6 7declare ptr @memrchr(ptr, i32, i64) 8 9@ax = external global [0 x i8] 10@ax1 = external global [1 x i8] 11@a12345 = constant [5 x i8] c"\01\02\03\04\05" 12 13 14; Do not fold memrchr(a12345, C, UINT32_MAX + 1LU) to null or to a12345 15; as might happen if the size were to be truncated to int32_t. 16 17define ptr @call_memrchr_a12345_c_ui32max_p1(i32 %C) { 18; CHECK-LABEL: @call_memrchr_a12345_c_ui32max_p1( 19; CHECK-NEXT: [[RET:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(4294967296) @a12345, i32 [[C:%.*]], i64 4294967296) 20; CHECK-NEXT: ret ptr [[RET]] 21; 22 23 %ret = call ptr @memrchr(ptr @a12345, i32 %C, i64 4294967296) 24 ret ptr %ret 25} 26 27 28; Do not fold memrchr(ax1, C, UINT32_MAX + 2LU) to null or to *ax1 == 1. 29 30define ptr @call_memrchr_ax1_c_ui32max_p2(i32 %C) { 31; CHECK-LABEL: @call_memrchr_ax1_c_ui32max_p2( 32; CHECK-NEXT: [[RET:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(4294967297) @ax1, i32 [[C:%.*]], i64 4294967297) 33; CHECK-NEXT: ret ptr [[RET]] 34; 35 36 %ret = call ptr @memrchr(ptr @ax1, i32 %C, i64 4294967297) 37 ret ptr %ret 38} 39 40 41; Do not fold memrchr(ax, C, UINT32_MAX + 2LU) to *ax == 1. 42 43define ptr @call_memrchr_ax_c_ui32max_p2(i32 %C) { 44; CHECK-LABEL: @call_memrchr_ax_c_ui32max_p2( 45; CHECK-NEXT: [[RET:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(4294967297) @ax, i32 [[C:%.*]], i64 4294967297) 46; CHECK-NEXT: ret ptr [[RET]] 47; 48 49 %ret = call ptr @memrchr(ptr @ax, i32 %C, i64 4294967297) 50 ret ptr %ret 51} 52 53 54; Do not fold memrchr(a12345, C, 6) to null. 55 56define ptr @call_memrchr_a12345_c_6(i32 %C) { 57; CHECK-LABEL: @call_memrchr_a12345_c_6( 58; CHECK-NEXT: [[RET:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(6) @a12345, i32 [[C:%.*]], i64 6) 59; CHECK-NEXT: ret ptr [[RET]] 60; 61 62 %ret = call ptr @memrchr(ptr @a12345, i32 %C, i64 6) 63 ret ptr %ret 64} 65 66 67; Do not fold memrchr(a12345, C, SIZE_MAX) to null. 68 69define ptr @call_memrchr_a12345_c_szmax(i32 %C) { 70; CHECK-LABEL: @call_memrchr_a12345_c_szmax( 71; CHECK-NEXT: [[RET:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(18446744073709551615) @a12345, i32 [[C:%.*]], i64 -1) 72; CHECK-NEXT: ret ptr [[RET]] 73; 74 75 %ret = call ptr @memrchr(ptr @a12345, i32 %C, i64 18446744073709551615) 76 ret ptr %ret 77} 78