There are 2 problems with this. The first is that CPUs want to do out of order execution and vectorization, so not allowing reordering can come at a significant

There are 2 problems with this. The first is that CPUs want to do out of order execution and vectorization, so not allowing reordering can come at a significant cost. The second problem is that different LIBMs and cpus will change the result of transcendental functions like exp.