123456789// 1. 向上取整#define CEIL(a, b) ((a + b - 1) / (b))// 2. FLOAT4,用于向量化访存,以下两种都可以// c写法#define FLOAT4(value) *(float4*)(&(value))// c++写法#define FLOAT4(value) (reinterpret_cast<float4*>(&(value))[0])