I have a small test case :
a = b * c + b * d
and clang is fatorizing b to get only one multiplication (-O3) which is normally good for most architectures. But in my case, that pattern takes just one instruction and I would like to recover it as is.
Where can I find this particular optimization in clang ?
Is there a way of setting multiplications as being cheaper than additions/subtracions in clang ?
Thanks in advance,