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 special case of memchr calls with the size of 1 are 5; folded as expected. 6 7declare ptr @memchr(ptr, i32, i64) 8 9@ax = external global [0 x i8] 10@a12345 = constant [5 x i8] c"\01\02\03\04\05" 11 12 13; Fold memchr(a12345, 1, 1) to a12345. 14 15define ptr @fold_memchr_a12345_1_1() { 16; CHECK-LABEL: @fold_memchr_a12345_1_1( 17; CHECK-NEXT: ret ptr @a12345 18; 19 20 %res = call ptr @memchr(ptr @a12345, i32 1, i64 1) 21 ret ptr %res 22} 23 24 25; Fold memchr(a12345, 2, 1) to null. 26 27define ptr @fold_memchr_a12345_2_1() { 28; CHECK-LABEL: @fold_memchr_a12345_2_1( 29; CHECK-NEXT: ret ptr null 30; 31 32 %res = call ptr @memchr(ptr @a12345, i32 2, i64 1) 33 ret ptr %res 34} 35 36 37; Fold memchr(ax, 257, 1) to (unsigned char)*ax == 1 ? ax : null 38; to verify the constant 257 is converted to unsigned char (yielding 1). 39 40define ptr @fold_memchr_ax_257_1(i32 %chr, i64 %n) { 41; CHECK-LABEL: @fold_memchr_ax_257_1( 42; CHECK-NEXT: [[MEMCHR_CHAR0:%.*]] = load i8, ptr @ax, align 1 43; CHECK-NEXT: [[MEMCHR_CHAR0CMP:%.*]] = icmp eq i8 [[MEMCHR_CHAR0]], 1 44; CHECK-NEXT: [[MEMCHR_SEL:%.*]] = select i1 [[MEMCHR_CHAR0CMP]], ptr @ax, ptr null 45; CHECK-NEXT: ret ptr [[MEMCHR_SEL]] 46; 47 48 %res = call ptr @memchr(ptr @ax, i32 257, i64 1) 49 ret ptr %res 50} 51 52 53; Fold memchr(ax, c, 1) to (unsigned char)*ax == (unsigned char)c ? ax : null. 54 55define ptr @fold_memchr_ax_c_1(i32 %chr, i64 %n) { 56; CHECK-LABEL: @fold_memchr_ax_c_1( 57; CHECK-NEXT: [[MEMCHR_CHAR0:%.*]] = load i8, ptr @ax, align 1 58; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[CHR:%.*]] to i8 59; CHECK-NEXT: [[MEMCHR_CHAR0CMP:%.*]] = icmp eq i8 [[MEMCHR_CHAR0]], [[TMP1]] 60; CHECK-NEXT: [[MEMCHR_SEL:%.*]] = select i1 [[MEMCHR_CHAR0CMP]], ptr @ax, ptr null 61; CHECK-NEXT: ret ptr [[MEMCHR_SEL]] 62; 63 64 %res = call ptr @memchr(ptr @ax, i32 %chr, i64 1) 65 ret ptr %res 66} 67