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//#define VAR A
#define SIMD 
 
#include <cassert>
#include <algorithm>
#include <iterator>
#include <random>
#include <vector>
#include <functional>
#include <emmintrin.h>
#include <tmmintrin.h>
#include <xmmintrin.h>
#include <cstdint>
 
int signumA(int x) {
  if (x > 0)
     return 1;
  if (x < 0)
     return -1;
  if (x == 0)
     return 0;
  assert(false);
}
int signumB(int x) {
  return (x>0) - (x<0);
}
int signumC(int x) {
  return std::min(std::max(-1, x), 1);
}
int signumD(int x) {
  int y = 0;
  if (x > 0) y = 1;
  if (x < 0) y = -1;
  return y;
}
int signumE(int x) {
  return x ? x/std::abs(x) : 0;
}
 
void signum4(std::int32_t* result, const std::int32_t* values)
{
	_mm_store_si128(
		reinterpret_cast<__m128i*>(result),
		_mm_sign_epi32(_mm_set1_epi32(1), _mm_load_si128(reinterpret_cast<const __m128i*>(values))));
}
 
#define CONCAT2(a, b) a ## b
#define CONCAT(a, b) CONCAT2(a, b)
#define signumX CONCAT(signum, VAR)
 
int main(int argc, const char *argv[]) {
  int length = std::atoi(argv[1]);
  int iterations = std::atoi(argv[2]);
 
  // make length the smallest multiple of 4 that is at least
  // the requested length.
  if (length % 4 > 0)
	  length += 4 - length % 4;
 
  std::mt19937 mersenne_engine(42); // fixed seed
  std::uniform_int_distribution<int> dist(-1000, 1000);
 
  int* nums = static_cast<int*>(_mm_malloc(sizeof(int) * length, alignof(__m128i)));
  int* results = static_cast<int*>(_mm_malloc(sizeof(int) * length, alignof(__m128i)));
 
  generate_n(nums, length, bind(dist, mersenne_engine));
 
  while (iterations--) {
	#ifdef SIMD
		for (int i = 0; i < length; i += 4)
			signum4(results + i, nums + i);
	#else
		for (int i = 0; i < length; ++i)
			results[i] = signumX(nums[i]);
    #endif
  }
 
  return 0;
}

prog.cpp: In function 'void signum4(int32_t*, const int32_t*)':
prog.cpp:42:17: warning: SSE vector return without SSE enabled changes the ABI [-Wpsabi]
  _mm_store_si128(
                 ^
In file included from /usr/lib/gcc/i586-linux-gnu/5/include/xmmintrin.h:1249:0,
                 from /usr/lib/gcc/i586-linux-gnu/5/include/x86intrin.h:31,
                 from /usr/include/i386-linux-gnu/c++/5/bits/opt_random.h:33,
                 from /usr/include/c++/5/random:50,
                 from /usr/include/c++/5/bits/stl_algo.h:66,
                 from /usr/include/c++/5/algorithm:62,
                 from prog.cpp:5:
/usr/lib/gcc/i586-linux-gnu/5/include/emmintrin.h:708:1: error: inlining failed in call to always_inline 'void _mm_store_si128(__m128i*, __m128i)': target specific option mismatch
 _mm_store_si128 (__m128i *__P, __m128i __B)
 ^
prog.cpp:44:95: error: called from here
   _mm_sign_epi32(_mm_set1_epi32(1), _mm_load_si128(reinterpret_cast<const __m128i*>(values))));
                                                                                               ^
In file included from /usr/lib/gcc/i586-linux-gnu/5/include/x86intrin.h:37:0,
                 from /usr/include/i386-linux-gnu/c++/5/bits/opt_random.h:33,
                 from /usr/include/c++/5/random:50,
                 from /usr/include/c++/5/bits/stl_algo.h:66,
                 from /usr/include/c++/5/algorithm:62,
                 from prog.cpp:5:
/usr/lib/gcc/i586-linux-gnu/5/include/tmmintrin.h:160:1: error: inlining failed in call to always_inline '__m128i _mm_sign_epi32(__m128i, __m128i)': target specific option mismatch
 _mm_sign_epi32 (__m128i __X, __m128i __Y)
 ^
prog.cpp:42:17: error: called from here
  _mm_store_si128(
                 ^
In file included from /usr/lib/gcc/i586-linux-gnu/5/include/xmmintrin.h:1249:0,
                 from /usr/lib/gcc/i586-linux-gnu/5/include/x86intrin.h:31,
                 from /usr/include/i386-linux-gnu/c++/5/bits/opt_random.h:33,
                 from /usr/include/c++/5/random:50,
                 from /usr/include/c++/5/bits/stl_algo.h:66,
                 from /usr/include/c++/5/algorithm:62,
                 from prog.cpp:5:
/usr/lib/gcc/i586-linux-gnu/5/include/emmintrin.h:637:1: error: inlining failed in call to always_inline '__m128i _mm_set1_epi32(int)': target specific option mismatch
 _mm_set1_epi32 (int __A)
 ^
prog.cpp:42:17: error: called from here
  _mm_store_si128(
                 ^
In file included from /usr/lib/gcc/i586-linux-gnu/5/include/xmmintrin.h:1249:0,
                 from /usr/lib/gcc/i586-linux-gnu/5/include/x86intrin.h:31,
                 from /usr/include/i386-linux-gnu/c++/5/bits/opt_random.h:33,
                 from /usr/include/c++/5/random:50,
                 from /usr/include/c++/5/bits/stl_algo.h:66,
                 from /usr/include/c++/5/algorithm:62,
                 from prog.cpp:5:
/usr/lib/gcc/i586-linux-gnu/5/include/emmintrin.h:690:1: error: inlining failed in call to always_inline '__m128i _mm_load_si128(const __m128i*)': target specific option mismatch
 _mm_load_si128 (__m128i const *__P)
 ^
prog.cpp:42:17: error: called from here
  _mm_store_si128(
                 ^

Standard output is empty