clang/test/Sema/conversion-64-32.c

// RUN: %clang_cc1 -fsyntax-only -verify -Wshorten-64-to-32 -triple x86_64-apple-darwin %s

int test0(long v) {
  return v; // expected-warning {{implicit conversion loses integer precision}}
}

typedef int  int4  __attribute__ ((vector_size(16)));
typedef long long long2 __attribute__((__vector_size__(16)));

int4 test1(long2 a) {
  int4  v127 = a;  // no warning.
  return v127; 
}

int test2(long v) {
  return v / 2; // expected-warning {{implicit conversion loses integer precision: 'long' to 'int'}}
}