the performance definitely varies doing this by hand - I guess the current optimizers don't rearrange the code as much as a human can while seeing that it's sti

the performance definitely varies doing this by hand - I guess the current optimizers don't rearrange the code as much as a human can while seeing that it's still equivalent. But sometimes (I'm using LLVM) just rearranging the parentheses to force a different evaluation order makes a difference where I thought it wouldn't have after optimization.