mcostalba/Stockfish — pull request #198 by jromang (2014-04-14 05:14:25+00:00)
Title: Enable BMI1 too when using BMI2 ARCH

Adding BMI1 allows the compiler to use _blsr_u64 automatically (the advertised 0.3% speed gain).
I verified that the compiler does not use this instruction with the -mbmi2 flag only. Also, all processors supporting BMI2 is also supporting BMI1.
No functional change.