clang/test/CodeGenCXX/datasizeof.cpp

   1 // RUN: %clang_cc1 -triple x86_64-unknown-gnu-linux -emit-llvm %s -o - | FileCheck %s
   2
   3 // CHECK-LABEL: define dso_local noundef i32 @_Z4testi(
   4 // CHECK-SAME: i32 noundef [[I:%.*]]) #[[ATTR0:[0-9]+]] {
   5 // CHECK-NEXT:  entry:
   6 // CHECK-NEXT:    [[I_ADDR:%.*]] = alloca i32, align 4
   7 // CHECK-NEXT:    store i32 [[I]], ptr [[I_ADDR]], align 4
   8 // CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr [[I_ADDR]], align 4
   9 // CHECK-NEXT:    [[INC:%.*]] = add nsw i32 [[TMP0]], 1
  10 // CHECK-NEXT:    store i32 [[INC]], ptr [[I_ADDR]], align 4
  11 // CHECK-NEXT:    [[TMP1:%.*]] = zext i32 [[TMP0]] to i64
  12 // CHECK-NEXT:    [[TMP2:%.*]] = mul nuw i64 4, [[TMP1]]
  13 // CHECK-NEXT:    [[TMP3:%.*]] = load i32, ptr [[I_ADDR]], align 4
  14 // CHECK-NEXT:    ret i32 [[TMP3]]
  15 //
  16 int test(int i) {
  17   (void)__datasizeof(int[i++]);
  18   return i;
  19 }