Created by: gangliao

Currently, we have four release binaries, no-avx CPU, avx-CPU, no-avx-GPU, avx-GPU., which looks quite miscellaneous. Actually, we can check CPU capabilities at runtime via

1. query cpuid

#ifdef _WIN32
/// MSVC CPUID
#define cpuid(info, x)    __cpuidex(info, x, 0)
#else
//  GCC Intrinsics
#include <cpuid.h>
/// gcc / clang CPUID
#define cpuid(info, x) __cpuid_count(x, 0, info[0], info[1], info[2], info[3])
#endif

2. Then, do some bit manipulation to check whether AVX is supported or not.

That can help us decline in number of release binaries from four to two.

• Add SIMD flags source code in paddle/utils #800
• change macro #if in current PaddlePaddle to support AVX and SSE at runtime