llvm/test/CFrontend/2005-05-06-CountBuiltins.c

// RUN: %llvmgcc %s -S -o - | llvm-as | llvm-dis | not grep call.*__builtin

int G, H, I;
void foo(int P) {
  G = __builtin_clz(P);
  H = __builtin_ctz(P);
  I = __builtin_popcount(P);
}

long long g, h, i;
void fooll(float P) {
  g = __builtin_clzll(P);
  g = __builtin_clzll(P);
  h = __builtin_ctzll(P);
  i = __builtin_popcountll(P);
}