1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4 2; RUN: opt < %s -passes=memcpyopt,instcombine -S -verify-memoryssa | FileCheck --check-prefix=CUSTOM %s 3; RUN: opt < %s -O2 -S | FileCheck --check-prefix=O2 %s 4 5; Check that we eliminate all `memcpy` calls in this function. 6define void @memcpy_forward_back_with_offset(ptr %arg) { 7; CUSTOM-LABEL: define void @memcpy_forward_back_with_offset( 8; CUSTOM-SAME: ptr [[ARG:%.*]]) { 9; CUSTOM-NEXT: store i8 1, ptr [[ARG]], align 1 10; CUSTOM-NEXT: ret void 11; 12; O2-LABEL: define void @memcpy_forward_back_with_offset( 13; O2-SAME: ptr writeonly captures(none) initializes((0, 1)) [[ARG:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] { 14; O2-NEXT: store i8 1, ptr [[ARG]], align 1 15; O2-NEXT: ret void 16; 17 %i = alloca [753 x i8], align 1 18 %i1 = alloca [754 x i8], align 1 19 call void @llvm.memcpy.p0.p0.i64(ptr %i1, ptr %arg, i64 754, i1 false) 20 %i2 = getelementptr inbounds i8, ptr %i1, i64 1 21 call void @llvm.memcpy.p0.p0.i64(ptr %i, ptr %i2, i64 753, i1 false) 22 store i8 1, ptr %arg, align 1 23 %i3 = getelementptr inbounds i8, ptr %arg, i64 1 24 call void @llvm.memcpy.p0.p0.i64(ptr %i3, ptr %i, i64 753, i1 false) 25 ret void 26} 27 28declare void @llvm.memcpy.p0.p0.i64(ptr, ptr, i64, i1) 29