clang/test/CodeGen/bpf-preserve-static-offset-pai.c

   1 // NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 2
   2 // REQUIRES: bpf-registered-target
   3 // RUN: %clang -cc1 -triple bpf -disable-llvm-passes -S -emit-llvm -o - %s \
   4 // RUN: | FileCheck %s
   5
   6 // Verify that preserve_static_offset does not interfere with
   7 // preserve_access_index at IR generation stage.
   8
   9 #define __ctx __attribute__((preserve_static_offset))
  10 #define __pai __attribute__((preserve_access_index))
  11
  12 struct foo {
  13   int a;
  14 } __ctx __pai;
  15
  16 // CHECK-LABEL: define dso_local i32 @bar
  17 // CHECK-SAME: (ptr noundef [[P:%.*]]) #[[ATTR0:[0-9]+]] {
  18 // CHECK-NEXT:  entry:
  19 // CHECK-NEXT:    [[P_ADDR:%.*]] = alloca ptr, align 8
  20 // CHECK-NEXT:    store ptr [[P]], ptr [[P_ADDR]], align 8
  21 // CHECK-NEXT:    [[TMP0:%.*]] = load ptr, ptr [[P_ADDR]], align 8
  22 // CHECK-NEXT:    [[TMP1:%.*]] = call ptr @llvm.preserve.static.offset(ptr [[TMP0]])
  23 // CHECK-NEXT:    [[A:%.*]] = getelementptr inbounds [[STRUCT_FOO:%.*]], ptr [[TMP1]], i32 0, i32 0
  24 // CHECK-NEXT:    [[TMP2:%.*]] = load i32, ptr [[A]], align 4
  25 // CHECK-NEXT:    ret i32 [[TMP2]]
  26 //
  27 int bar(struct foo *p) {
  28   return p->a;
  29 }