Emu 是用于编程 GPU 的高级语言。与其他语言（如 OpenCL 或 Halide）嵌入 C 或 C ++ 不同，Emu 用于嵌入 Rust。它为编写函数提供了单个过程宏。宏将编译时的函数转换为较低级别的代码，以便它们可以在 GPU 上运行。

Emu 还提供了一些旨在使编程 GPU 更易于访问的功能，例如内置数学和物理常量，单元注释和隐式转换。这是一些示例函数：

emu! {
	// more particles
	more_particles(num_particles u32, num_moles u32) u32 {
		return num_particles + num_moles * L;
	}

	// moves particles
	move_particles(global_particles_x [f32], global_particles_y f32, global_particles_z f32) {
		global_particles_z[get_global_id(0)] += 7.3e1 as nm;
		global_particles_x[get_global_id(0)] += 2 as cm;
		global_particles_y[get_global_id(0)] += 6 as cm;
	}
	
	// moves particles in circle
	rotate_particles(global_particles_r [f32]) {
		global_particles_r[get_global_id(0)] += 7.5 * TAU;
	}

	// multiplies 2 matrices
	// n is the dimension of the matrices
	// a and b are the matrices to be multiplied, c is the result
	multiply_matrices(n i32, global_a [f32], global_b [f32], global_c [f32]) {
		// indices of cells to multiply
		let i: i32 = get_global_id(0);
		let j: i32 = get_global_id(1);

		// execute step of multiplication
		for k in 0..n {
			global_c[i * n + j] += global_a[i * n + k] * global_b[k * n + j];
		}
	}
}