| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -passes=instcombine -S | FileCheck %s |
| |
| ; Verify that the special case of memchr calls with the size of 1 are |
| ; folded as expected. |
| |
| declare i8* @memchr(i8*, i32, i64) |
| |
| @ax = external global [0 x i8] |
| @a12345 = constant [5 x i8] c"\01\02\03\04\05" |
| |
| |
| ; Fold memchr(a12345, 1, 1) to a12345. |
| |
| define i8* @fold_memchr_a12345_1_1() { |
| ; CHECK-LABEL: @fold_memchr_a12345_1_1( |
| ; CHECK-NEXT: ret i8* getelementptr inbounds ([5 x i8], [5 x i8]* @a12345, i64 0, i64 0) |
| ; |
| |
| %ptr = getelementptr [5 x i8], [5 x i8]* @a12345, i32 0, i32 0 |
| %res = call i8* @memchr(i8* %ptr, i32 1, i64 1) |
| ret i8* %res |
| } |
| |
| |
| ; Fold memchr(a12345, 2, 1) to null. |
| |
| define i8* @fold_memchr_a12345_2_1() { |
| ; CHECK-LABEL: @fold_memchr_a12345_2_1( |
| ; CHECK-NEXT: ret i8* null |
| ; |
| |
| %ptr = getelementptr [5 x i8], [5 x i8]* @a12345, i32 0, i32 0 |
| %res = call i8* @memchr(i8* %ptr, i32 2, i64 1) |
| ret i8* %res |
| } |
| |
| |
| ; Fold memchr(ax, 257, 1) to (unsigned char)*ax == 1 ? ax : null |
| ; to verify the constant 257 is converted to unsigned char (yielding 1). |
| |
| define i8* @fold_memchr_ax_257_1(i32 %chr, i64 %n) { |
| ; CHECK-LABEL: @fold_memchr_ax_257_1( |
| ; CHECK-NEXT: [[MEMCHR_CHAR0:%.*]] = load i8, i8* getelementptr inbounds ([0 x i8], [0 x i8]* @ax, i64 0, i64 0), align 1 |
| ; CHECK-NEXT: [[MEMCHR_CHAR0CMP:%.*]] = icmp eq i8 [[MEMCHR_CHAR0]], 1 |
| ; CHECK-NEXT: [[MEMCHR_SEL:%.*]] = select i1 [[MEMCHR_CHAR0CMP]], i8* getelementptr inbounds ([0 x i8], [0 x i8]* @ax, i64 0, i64 0), i8* null |
| ; CHECK-NEXT: ret i8* [[MEMCHR_SEL]] |
| ; |
| |
| %ptr = getelementptr [0 x i8], [0 x i8]* @ax, i32 0, i32 0 |
| %res = call i8* @memchr(i8* %ptr, i32 257, i64 1) |
| ret i8* %res |
| } |
| |
| |
| ; Fold memchr(ax, c, 1) to (unsigned char)*ax == (unsigned char)c ? ax : null. |
| |
| define i8* @fold_memchr_ax_c_1(i32 %chr, i64 %n) { |
| ; CHECK-LABEL: @fold_memchr_ax_c_1( |
| ; CHECK-NEXT: [[MEMCHR_CHAR0:%.*]] = load i8, i8* getelementptr inbounds ([0 x i8], [0 x i8]* @ax, i64 0, i64 0), align 1 |
| ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[CHR:%.*]] to i8 |
| ; CHECK-NEXT: [[MEMCHR_CHAR0CMP:%.*]] = icmp eq i8 [[MEMCHR_CHAR0]], [[TMP1]] |
| ; CHECK-NEXT: [[MEMCHR_SEL:%.*]] = select i1 [[MEMCHR_CHAR0CMP]], i8* getelementptr inbounds ([0 x i8], [0 x i8]* @ax, i64 0, i64 0), i8* null |
| ; CHECK-NEXT: ret i8* [[MEMCHR_SEL]] |
| ; |
| |
| %ptr = getelementptr [0 x i8], [0 x i8]* @ax, i32 0, i32 0 |
| %res = call i8* @memchr(i8* %ptr, i32 %chr, i64 1) |
| ret i8* %res |
| } |