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 an excessive size to memchr() isn't truncated to an in-bounds 5; value that results in the call being incorrectly folded (as might happen 6; when LLVM is compiled in ILP32 mode). 7 8declare ptr @memchr(ptr, i32, i64) 9 10@ax = external global [0 x i8] 11@a12345 = constant [5 x i8] c"\01\02\03\04\05" 12 13 14; Do not fold memchr(ax, 1, UINT_MAX + (size_t)1) to null. Only the first 15; byte in ax must be dereferenceable. 16 17define ptr @call_memchr_ax_2_uimax_p1() { 18; CHECK-LABEL: @call_memchr_ax_2_uimax_p1( 19; CHECK-NEXT: [[RES:%.*]] = call ptr @memchr(ptr noundef nonnull dereferenceable(1) @ax, i32 1, i64 4294967296) 20; CHECK-NEXT: ret ptr [[RES]] 21; 22 23 %res = call ptr @memchr(ptr @ax, i32 1, i64 4294967296) 24 ret ptr %res 25} 26 27 28; Do not fold memchr(ax, 1, UINT_MAX + (size_t)2) to *ax == 1 ? ax : null. 29; As above, only the first byte in ax must be dereferenceable. 30 31define ptr @call_memchr_ax_2_uimax_p2() { 32; CHECK-LABEL: @call_memchr_ax_2_uimax_p2( 33; CHECK-NEXT: [[RES:%.*]] = call ptr @memchr(ptr noundef nonnull dereferenceable(1) @ax, i32 1, i64 4294967296) 34; CHECK-NEXT: ret ptr [[RES]] 35; 36 37 %res = call ptr @memchr(ptr @ax, i32 1, i64 4294967296) 38 ret ptr %res 39} 40 41 42; Fold memchr(a12345, 3, UINT_MAX + (size_t)2) to a12345 + 2 (and not to 43; null). 44 45define ptr @fold_memchr_a12345_3_uimax_p2() { 46; CHECK-LABEL: @fold_memchr_a12345_3_uimax_p2( 47; CHECK-NEXT: ret ptr getelementptr inbounds nuw (i8, ptr @a12345, i64 2) 48; 49 50 %res = call ptr @memchr(ptr @a12345, i32 3, i64 4294967297) 51 ret ptr %res 52} 53 54 55; Do not fold memchr(a12345, c, UINT_MAX + (size_t)2). 56 57define ptr @fold_memchr_a12345_c_uimax_p2(i32 %0) { 58; CHECK-LABEL: @fold_memchr_a12345_c_uimax_p2( 59; CHECK-NEXT: [[RES:%.*]] = call ptr @memchr(ptr noundef nonnull dereferenceable(1) @a12345, i32 [[TMP0:%.*]], i64 4294967297) 60; CHECK-NEXT: ret ptr [[RES]] 61; 62 63 %res = call ptr @memchr(ptr @a12345, i32 %0, i64 4294967297) 64 ret ptr %res 65} 66