31 lines · c
1// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 22// REQUIRES: bpf-registered-target3// RUN: %clang_cc1 -triple bpfel -disable-llvm-passes -emit-llvm -o - %s | FileCheck %s4 5// Check that call to preserve.static.offset is generated when bitfield6// from a struct marked with __attribute__((preserve_static_offset)) is7// accessed.8 9#define __ctx __attribute__((preserve_static_offset))10 11struct foo {12 unsigned a:1;13} __ctx;14 15// CHECK-LABEL: define dso_local void @lvalue_bitfield16// CHECK-SAME: (ptr noundef [[P:%.*]]) #[[ATTR0:[0-9]+]] {17// CHECK-NEXT: entry:18// CHECK-NEXT: [[P_ADDR:%.*]] = alloca ptr, align 819// CHECK-NEXT: store ptr [[P]], ptr [[P_ADDR]], align 820// CHECK-NEXT: [[TMP0:%.*]] = load ptr, ptr [[P_ADDR]], align 821// CHECK-NEXT: [[TMP1:%.*]] = call ptr @llvm.preserve.static.offset(ptr [[TMP0]])22// CHECK-NEXT: [[BF_LOAD:%.*]] = load i8, ptr [[TMP1]], align 423// CHECK-NEXT: [[BF_CLEAR:%.*]] = and i8 [[BF_LOAD]], -224// CHECK-NEXT: [[BF_SET:%.*]] = or i8 [[BF_CLEAR]], 125// CHECK-NEXT: store i8 [[BF_SET]], ptr [[TMP1]], align 426// CHECK-NEXT: ret void27//28void lvalue_bitfield(struct foo *p) {29 p->a = 1;30}31