Heinrich Schuchardt <[email protected]> writes: > You have to put > __attribute__((optimize("unroll-loops"))) > here to unroll the loop inside the function: > > > static __attribute__ ((noinline)) > __attribute__((optimize("unroll-loops"))) > int test(unsigned char *name) > > $ time ./c.inline aaaaaaaaaaa > 14 > > real 0m0.743s > user 0m0.740s > sys 0m0.000s > > Without __attribute__((optimize("unroll-loops"))) : > $ time ./c.loop aaaaaaaaaaa > 14 > > real 0m1.482s > user 0m1.472s > sys 0m0.004s > > With __attribute__((optimize("unroll-loops"))) : > > $ time ./c.loop aaaaaaaaaaa > 14 > > real 0m0.742s > user 0m0.740s > sys 0m0.000s
This attribute has to be added to the caller, not fat_checksum()? I.e., we has to add it to all callers of fat_checksum()? Well, this is interesting gcc optimize option though, maybe not worth to introduce this to kernel only for fatfs. Thanks. -- OGAWA Hirofumi <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
