test/CodeGen/prefetch-addr-spaces.c

// RUN: %clang_cc1 -no-opaque-pointers -triple x86_64-pc-linux -emit-llvm %s -o - | FileCheck %s

void f(int __attribute__((address_space(1))) * a, ...) {
  __builtin_prefetch(a, 0, 1);
  // CHECK: call void @llvm.prefetch.p1i8(i8 addrspace(1)* {{%.+}}, i32 0, i32 1, i32 1)
}